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69-585: Tilling can mean: Tillage , an agricultural preparation of the soil. TILLING (molecular biology) Tilling is a fictional town in the Mapp and Lucia novels of E. F. Benson. Tilling Green, Ledshire , is a fictional village in Patricia Wentworth's Miss Silver novel, Poison in the Pen . The Tilling Group , once a major British bus company and later

138-428: A Pinus resinosa stand, aged 90 to 100 years. Mule The mule is a domestic equine hybrid between a donkey and a horse . It is the offspring of a male donkey (a jack) and a female horse (a mare ). The horse and the donkey are different species, with different numbers of chromosomes ; of the two possible first-generation hybrids between them, the mule is easier to obtain and more common than

207-543: A conglomerate . Thomas Tilling was Cockney rhyming slang for a shilling . People with the surname Tilling Robert I. Tilling , geologist Roger Tilling , a British broadcaster Thomas Tilling , founder of the Tilling Group Tilling slang when someone rubs someone else behind, in a circular motion for a long period of time Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with

276-546: A "molly" or "Molly mule", although the term is sometimes used to refer to female mules in general. A male mule is properly called a "horse mule", although it is often called a "john mule", which is the correct term for a gelded mule. A young male mule is called a "mule colt", and a young female is called a "mule filly". Breeding of mules became possible only when the range of the domestic horse, which originated in Central Asia in about 3500 BC , extended into that of

345-560: A big influence on soil temperature. Draper et al. (1985), for instance, documented this as well as the effect it had on root growth of outplants (Table 30). The mounds warmed up quickest, and at soil depths of 0.5 cm and 10 cm averaged 10 and 7 °C higher, respectively, than in the control. On sunny days, daytime surface temperature maxima on the mound and organic mat reached 25 °C to 60 °C, depending on soil wetness and shading. Mounds reached mean soil temperatures of 10 °C at 10 cm depth 5 days after planting, but

414-472: A broadcast slash fire in a clearcut does not give a uniform burn over the whole area. Tarrant (1954), for instance, found only 4% of a 140-ha slash burn had burned severely, 47% had burned lightly, and 49% was unburned. Burning after windrowing obviously accentuates the subsequent heterogeneity. Marked increases in exchangeable calcium also correlated with the amount of slash at least 7 cm in diameter consumed. Phosphorus availability also increased, both in

483-448: A general deterioration in site productivity; Endean and Johnstone (1974) describe experiments to test prescribed burning as a means of seedbed preparation and site amelioration on representative clear-felled Picea/Abies areas. Results showed that, in general, prescribed burning did not reduce organic layers satisfactorily, nor did it increase soil temperature, on the sites tested. Increases in seedling establishment, survival, and growth on

552-517: A mule foal cloned by nuclear transfer of cells from foetal material, was born at the University of Idaho in Moscow, Idaho . Neither an equid nor a hybrid animal had been cloned before. In general terms, in both the mule and the hinny, the foreparts and head of the animal are similar to those of the father sire , while the hindparts and tail tend to resemble those of the dam . A mule

621-407: A mule's giving birth was a frequently recorded portent in antiquity, although scientific writers also doubted whether it was really possible (see e.g. Aristotle , Historia animalium , 6.24; Varro , De re rustica , 2.1.28). Between 1527 and 2002, approximately sixty such births were reported. In Morocco in early 2002 and Colorado in 2007, mare mules produced colts. Blood and hair samples from

690-554: A significantly higher volume (329 cm ) than open plantations (204 cm ). Wang et al. (2000) recommended that sheltered plantation site preparation should be used. Up to 1970, no "sophisticated" site preparation equipment had become operational in Ontario, but the need for more efficacious and versatile equipment was increasingly recognized. By this time, improvements were being made to equipment originally developed by field staff, and field testing of equipment from other sources

759-465: A similar sturdy animal. Horses are generally unsuitable, though breeds such as the Clydesdale were bred as draft animals. Tilling could at times be very labor-intensive. This aspect is discussed in the 16th-century French agronomic text written by Charles Estienne : A raw, rough, and tough soil is hard to till and will neither bring forth corn, nor any other thing without great labor, however

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828-477: A stallion, was bred to several mares, which gave birth to live foals that showed no characteristics of the donkey. In 1995, a group from the Federal University of Minas Gerais described a female mule that was pregnant for a seventh time, having previously produced two donkey sires, two foals with the typical 63 chromosomes of mules, and several horse stallions that had produced four foals. The three of

897-661: A table of slash weight and size distribution on one acre of a hypothetical stand of white spruce. When the diameter distribution of a stand is unknown, an estimate of slash weight and size distribution can be obtained from average stand diameter, number of trees per unit area, and merchantable cubic foot volume. The sample trees in Kiil's study had full symmetrical crowns. Densely growing trees with short and often irregular crowns would probably be overestimated; open-grown trees with long crowns would probably be underestimated. The need to provide shade for young outplants of Engelmann spruce in

966-434: Is commonly used to prepare clearcut sites for planting, e.g., in central British Columbia, and in the temperate region of North America generally. Prescribed burning is carried out primarily for slash hazard reduction and to improve site conditions for regeneration; all or some of the following benefits may accrue: Prescribed burning for preparing sites for direct seeding was tried on a few occasions in Ontario, but none of

1035-462: Is deeper and more thorough is classified as primary, and tillage that is shallower and sometimes more selective of location is secondary. Primary tillage such as ploughing tends to produce a rough surface finish, whereas secondary tillage tends to produce a smoother surface finish, such as that required to make a good seedbed for many crops. Harrowing and rototilling often combine primary and secondary tillage into one operation. "Tillage" can also mean

1104-522: Is generally larger than a hinny, with longer ears and a heavier head; the tail is usually covered with long hair like that of its mare mother. A mule has the thin limbs, small narrow hooves and short mane of the donkey, while its height, the shape of the neck and body, and the uniformity of its coat and teeth are more similar to those of the horse. Mules vary widely in size, from small miniature mules under 125 cm (50 in) to large and powerful draught mules standing up to 180 cm (70 in) at

1173-496: Is often referred to as conventional tillage , but as conservational tillage is now more widely used than intensive tillage (in the United States), it is often not appropriate to refer to this type of tillage as conventional. Intensive tillage often involves multiple operations with implements such as a mold board, disk, or chisel plow . After this, a finisher with a harrow , rolling basket, and cutter can be used to prepare

1242-444: Is rare, but can occasionally occur naturally, as well as through embryo transfer . A few mare mules have produced offspring when mated with a horse or donkey stallion. Herodotus gives an account of such an event as an ill omen of Xerxes' invasion of Greece in 480 BC: "There happened also a portent of another kind while he was still at Sardis—a mule brought forth young and gave birth to a mule" (Herodotus The Histories 7:57), and

1311-425: Is undertaken to ameliorate one or more constraints that would otherwise be likely to thwart management objectives. A valuable bibliography on the effects of soil temperature and site preparation on subalpine and boreal tree species has been prepared by McKinnon et al. (2002). Site preparation is the work that is done before a forest area is regenerated. Some types of site preparation are burning. Broadcast burning

1380-745: The farm tractor was introduced, which made modern large-scale agriculture possible. However, the destruction of the prairie grasses and tillage of the fertile topsoil of the American Midwest caused the Dust Bowl , in which the soil was blown away and stirred up into dust storms that blackened the sky. This prompted re-consideration of tillage techniques, but in the United States as of 2019, 3 trillion pounds of soil were estimated to be lost due to erosion while adoption of improved techniques for controlling erosion are still not widespread. In

1449-469: The forest fire hazard on harvested sites. Forest managers interested in the application of prescribed burning for hazard reduction and silviculture, were shown a method for quantifying the slash load by Kiil (1968). In west-central Alberta, he felled, measured, and weighed 60 white spruce, graphed (a) slash weight per merchantable unit volume against diameter at breast height (dbh), and (b) weight of fine slash (<1.27 cm) also against dbh, and produced

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1518-406: The hinny , which is the offspring of a male horse (a stallion ) and a female donkey (a jenny ). Mules vary widely in size, and may be of any color seen in horses or donkeys. They are more patient, hardier and longer-lived than horses, and are perceived as less obstinate and more intelligent than donkeys. A female mule that has oestrus cycles, and so could, in theory, carry a fetus, is called

1587-430: The withers . The median weight range is between about 370 and 460 kg (820 and 1000 lb). The coat may be of any color seen in the horse or in the donkey. Mules usually display the light points commonly seen in donkeys: pale or mealy areas on the belly and the insides of the thighs, on the muzzle, and around the eyes. They often have primitive markings such as dorsal stripe, shoulder stripe or zebra stripes on

1656-595: The Colorado birth verified that the mother was indeed a mule and the foal was indeed her offspring. A 1939 article in the Journal of Heredity describes two offspring of a fertile mare mule named "Old Bec," which was owned at the time by Texas A&M University in the late 1920s. One of the foals was a female, sired by a jack. Unlike her mother, she was sterile. The other, sired by a five-gaited Saddlebred stallion, exhibited no characteristics of any donkey. That horse,

1725-627: The New World. George Washington bred mules at his Mount Vernon home. At the time, they were not common in the United States, but Washington understood their value, as they were "more docile than donkeys and cheap to maintain." In the nineteenth century, they were used in various capacities as draught animals – on farms, especially where clay made the soil slippery and sticky; pulling canal boats; and famously for pulling, often in teams of 20 or more animals, wagonloads of borax out of Death Valley , California from 1883 to 1889. The wagons were among

1794-573: The USA's Northern Corn Belt states lacks consistent yield results; however, there is still interest in deep tillage within agriculture. In areas that are not well-drained, deep tillage may be used as an alternative to installing more expensive tile drainage. Plowing: Tilling can damage ancient structures such as long barrows . In the UK, half of the long barrows in Gloucestershire and almost all

1863-469: The book "Horse-Hoeing Husbandry: An Essay on the Principles of Vegetation and Tillage," which argued that soil needed to be pulverized into fine powder for plants to make use of it. Tull believed that, since water, air, and heat were clearly not the primary substance of a plant, plants were made of earth, and thus had to consume very small pieces of earth as food. Tull wrote that each subsequent tillage of

1932-555: The burial mounds in Essex have been damaged. According to English Heritage in 2003, ploughing with modern powerful tractors had done as much damage in the last six decades as traditional farming did in the previous six centuries. Modern agricultural science has greatly reduced the use of tillage. Crops can be grown for several years without any tillage through the use of herbicides to control weeds, crop varieties that tolerate packed soil, and equipment that can plant seeds or fumigate

2001-490: The burned sites were probably the result of slight reductions in the depth of the organic layer, minor increases in soil temperature, and marked improvements in the efficiency of the planting crews. Results also suggested that the process of site deterioration has not been reversed by the burning treatments applied. Slash weight (the oven-dry weight of the entire crown and that portion of the stem less than four inches in diameter) and size distribution are major factors influencing

2070-488: The burns was hot enough to produce a seedbed that was adequate without supplementary mechanical site preparation. Changes in soil chemical properties associated with burning include significantly increased pH, which Macadam (1987) in the Sub-boreal Spruce Zone of central British Columbia found persisting more than a year after the burn. Average fuel consumption was 20 to 24 t/ha and the forest floor depth

2139-401: The control did not reach that temperature until 58 days after planting. During the first growing season, mounds had 3 times as many days with a mean soil temperature greater than 10 °C than did the control microsites. Draper et al.'s (1985) mounds received 5 times the amount of photosynthetically active radiation (PAR) summed over all sampled microsites throughout the first growing season;

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2208-418: The control treatment consistently received about 14% of daily background PAR, while mounds received over 70%. By November, fall frosts had reduced shading, eliminating the differential. Quite apart from its effect on temperature, incident radiation is also important photosynthetically. The average control microsite was exposed to levels of light above the compensation point for only 3 hours, i.e., one-quarter of

2277-449: The crop plants. Primary tillage loosens the soil and mixes in fertilizer or plant material, resulting in soil with a rough texture. Secondary tillage produces finer soil and sometimes shapes the rows, preparing the seed bed. It also provides weed control throughout the growing season during the maturation of the crop plants, unless such weed control is instead achieved with low-till or no-till methods involving herbicides . Tilling

2346-504: The crop row. In comparison to no-till, which relies on the previous year's plant residue to protect the soil and aids in postponement of the warming of the soil and crop growth in Northern climates, zone tillage produces a strip approximately five inches wide that simultaneously breaks up plow pans, assists in warming the soil and helps to prepare a seedbed. When combined with cover crops, zone tillage helps replace lost organic matter, slows

2415-454: The daily light period, whereas mounds received light above the compensation point for 11 hours, i.e., 86% of the same daily period. Assuming that incident light in the 100–600 μE/m /s intensity range is the most important for photosynthesis , the mounds received over 4 times the total daily light energy that reached the control microsites. With linear site preparation, orientation is sometimes dictated by topography or other considerations, but

2484-520: The deterioration of the soil, improves soil drainage, increases soil water and nutrient holding capacity, and allows necessary soil organisms to survive. It has been successfully used on farms in the Midwest and West of the USA for over 40 years, and is currently used on more than 36% of the U.S. farmland. Some specific states where zone tillage is currently in practice are Pennsylvania, Connecticut, Minnesota, Indiana, Wisconsin, and Illinois. Its use in

2553-668: The domestic ass, which originated in north-eastern Africa. This overlap probably occurred in Anatolia and Mesopotamia in Western Asia, and mules were bred there before 1000 BC . A painting in the Tomb of Nebamun at Thebes , dating from approximately 1350 BC , shows a chariot drawn by a pair of animals which have been variously identified as onagers , as mules or as hinnies. Mules were present in Israel and Judah in

2622-535: The forest floor and in the 0 cm to 15 cm mineral soil layer, and the increase was still evident, albeit somewhat diminished, 21 months after burning. However, in another study in the same Sub-boreal Spruce Zone found that although it increased immediately after the burn, phosphorus availability had dropped to below pre-burn levels within 9 months. Nitrogen will be lost from the site by burning, though concentrations in remaining forest floor were found by Macadam (1987) to have increased in two out of six plots,

2691-577: The high Rocky Mountains is emphasized by the U.S. Forest Service. Acceptable planting spots are defined as microsites on the north and east sides of down logs, stumps, or slash, and lying in the shadow cast by such material. Where the objectives of management specify more uniform spacing, or higher densities, than obtainable from an existing distribution of shade-providing material, redistribution or importing of such material has been undertaken. Site preparation on some sites might be done simply to facilitate access by planters, or to improve access and increase

2760-405: The horse it inherits speed, conformation, and agility. Mules are reputed to exhibit a higher cognitive intelligence than their parent species, but robust scientific evidence to back up these claims is lacking. Preliminary data exist from at least two evidence-based studies, but they rely on a limited set of specialized cognitive tests and a small number of subjects . Mules are generally taller at

2829-410: The land that is tilled. The word "cultivation" has several senses that overlap substantially with those of "tillage". In a general context, both can refer to agriculture. Within agriculture, both can refer to any kind of soil agitation. Additionally, "cultivation" or "cultivating" may refer to an even narrower sense of shallow, selective secondary tillage of row crop fields that kills weeds while sparing

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2898-782: The largest ever pulled by draught animals, designed to carry 10 short tons (9 metric tons) of borax ore at a time. Mules were used by armies to transport supplies, occasionally as mobile firing platforms for smaller cannons, and to pull heavier field guns with wheels over mountainous trails such as in Afghanistan during the Second Anglo-Afghan War . In the second half of the twentieth century, widespread use of mules declined in industrialised countries. The use of mules for farming and for transportation of agricultural products largely gave way to steam-, then diesel-powered, tractors and lorries. On 5 May 2003, Idaho Gem ,

2967-452: The latter available for testing each bore 64 horse-like chromosomes. These foals phenotypically resembled horses, though they bore markings absent from the sire's known lineages, and one had ears noticeably longer than those typical of her sire's breed. The elder two horse-like foals had proved fertile at the time of publication, with their progeny being typical of horses. While a few mules can carry live weight up to 160 kg (353 lb),

3036-487: The legs. The mule exhibits hybrid vigor . Charles Darwin wrote: "The mule always appears to me a most surprising animal. That a hybrid should possess more reason, memory, obstinacy, social affection, powers of muscular endurance, and length of life, than either of its parents, seems to indicate that art has here outdone nature". The mule inherits from the donkey the traits of intelligence, sure-footedness, toughness, endurance, disposition, and natural cautiousness. From

3105-462: The mid 1930s Frank and Herbert Petty of Doncaster, Victoria, Australia developed the Petty Plough . This steerable plough could be pulled by either two horses or a tractor and the disc wheels could be steered in unison, or separately allowing the operator to plough the center of rows as well as between and around orchard trees. Primary tillage is usually conducted after the last harvest, when

3174-652: The mortality of white spruce. Significant difference in height was found between open and sheltered plantations for black spruce but not for white spruce, and root collar diameter in sheltered plantations was significantly larger than in open plantations for black spruce but not for white spruce. Black spruce open plantation had significantly smaller volume (97 cm ) compared with black spruce sheltered (210 cm ), as well as white spruce open (175 cm ) and sheltered (229 cm ) plantations. White spruce open plantations also had smaller volume than white spruce sheltered plantations. For transplant stock, strip plantations had

3243-542: The number of times the farmer travels over the field, significant savings in fuel and labor are made. Conservation tillage is used on over 370 million acres, mostly in South America, Oceania and North America. In most years since 1997, conservation tillage was used in US cropland more than intensive or reduced tillage. However, conservation tillage delays warming of the soil due to the reduction of dark earth exposure to

3312-447: The number or distribution of microsites suitable for planting or seeding. Wang et al. (2000) determined field performance of white and black spruces 8 and 9 years after outplanting on boreal mixedwood sites following site preparation (Donaren disc trenching versus no trenching) in 2 plantation types (open versus sheltered) in southeastern Manitoba. Donaren trenching slightly reduced the mortality of black spruce but significantly increased

3381-586: The orientation can often be chosen. It can make a difference. A disk-trenching experiment in the Sub-boreal Spruce Zone in interior British Columbia investigated the effect on growth of young outplants ( lodgepole pine ) in 13 microsite planting positions: berm, hinge, and trench in each of north, south, east, and west aspects, as well as in untreated locations between the furrows. Tenth-year stem volumes of trees on south-, east-, and west-facing microsites were significantly greater than those of trees on north-facing and untreated microsites. However, planting spot selection

3450-496: The others showing decreases. Nutrient losses may be outweighed, at least in the short term, by improved soil microclimate through the reduced thickness of forest floor where low soil temperatures are a limiting factor. The Picea/Abies forests of the Alberta foothills are often characterized by deep accumulations of organic matter on the soil surface and cold soil temperatures, both of which make reforestation difficult and result in

3519-612: The policy of seeking and obtaining for field testing new equipment from Scandinavia and elsewhere that seemed to hold promise for Ontario conditions, primarily in the north. Thus, testing was begun of the Brackekultivator from Sweden and the Vako-Visko rotary furrower from Finland. Site preparation treatments that create raised planting spots have commonly improved outplant performance on sites subject to low soil temperature and excess soil moisture. Mounding can certainly have

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3588-494: The seasons be temperate in moisture and dryness   ... you must labor it most exquisitely, harrow it and manure it very oft with great store of dung, so you shall make it better   ... but especially desire that they may not be watered with rain, for water is as good as poison to them. The popularity of tillage as an agricultural technique in early modern times had to do with theories about plant biology proposed by European thinkers. In 1731, English writer Jethro Tull published

3657-538: The seed bed. There are many variations. Conservation tillage leaves at least 30% of crop residue on the soil surface, or at least 1,000 lb/ac (1,100 kg/ha) of small grain residue on the surface during the critical soil erosion period. This slows water movement, which reduces the amount of soil erosion. Additionally, conservation tillage has been found to benefit predatory arthropods that can enhance pest control. Conservation tillage also benefits farmers by reducing fuel consumption and soil compaction. By reducing

3726-448: The shoulder than donkeys and have better endurance than horses, although a lower top speed. In the early twentieth century the mule was preferred to the horse as a pack animal – its skin is harder and less sensitive than that of a horse, and it is better able to bear heavy weights. A mule has 63 chromosomes , intermediate between the 64 of the horse and the 62 of the donkey. Mules are usually infertile for this reason. Pregnancy

3795-481: The slash. The S.F.I. scarifier, after strengthening, had been "quite successful" for 2 years, promising trials were under way with the cone scarifier and barrel ring scarifier, and development had begun on a new flail scarifier for use on sites with shallow, rocky soils. Recognition of the need to become more effective and efficient in site preparation led the Ontario Department of Lands and Forests to adopt

3864-461: The soil is wet enough to allow plowing but also allows good traction. Some soil types can be plowed dry. The objective of primary tillage is to attain a reasonable depth of soft soil, incorporate crop residues, kill weeds, and to aerate the soil. Secondary tillage is any subsequent tillage, to incorporate fertilizers, reduce the soil to a finer tilth , level the surface, or control weeds. Reduced tillage leaves between 15 and 30% crop residue cover on

3933-445: The soil or 500 to 1000 pounds per acre (560 to 1100 kg/ha) of small grain residue during the critical erosion period. This may involve the use of a chisel plow, field cultivators, or other implements. See the general comments below to see how they can affect the amount of residue. Intensive tillage leaves less than 15% crop residue cover or less than 500 pounds per acre (560 kg/ha) of small grain residue. This type of tillage

4002-581: The soil without really digging it up. This practice, called no-till farming , reduces costs and environmental change by reducing soil erosion and diesel fuel usage. Site preparation is any of the various treatments applied to a site to ready it for seeding or planting. The purpose is to facilitate the regeneration of that site by the chosen method. Site preparation may be designed to achieve, singly or in any combination, improved access by reducing or rearranging slash and ameliorating adverse forest floor, soil, vegetation, or other biotic factors. Site preparation

4071-548: The soil would increase its fertility, and that it was impossible to till the soil too much. However, scientific observation has shown that the opposite is true; tillage causes soil to lose structural qualities that allow plant roots, water, and nutrients to penetrate it, accelerates soil loss by erosion , and results in soil compaction . The steel plow allowed farming in the American Midwest , where tough prairie grasses and rocks caused trouble. Soon after 1900,

4140-432: The state of site preparation in Ontario noted that blades and rakes were found to be well suited to post-cut scarification in tolerant hardwood stands for natural regeneration of yellow birch . Plows were most effective for treating dense brush prior to planting, often in conjunction with a planting machine. Scarifying teeth, e.g., Young's teeth, were sometimes used to prepare sites for planting, but their most effective use

4209-549: The superiority of the mule becomes apparent in their additional endurance. In general, a mule can be packed with dead weight up to 20% of its body weight, or around 90 kg (198 lb). Although it depends on the individual animal, mules trained by the Army of Pakistan are reported to be able to carry up to 72 kg (159 lb) and walk 26 km (16.2 mi) without resting. The average equine in general can carry up to roughly 30% of its body weight in live weight, such as

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4278-720: The time of King David . There are many representations of them in Mesopotamian works of art dating from the first millennium BC. Among the bas-reliefs depicting the Lion Hunt of Ashurbanipal from the North Palace of Nineveh is a clear and detailed image of two mules loaded with nets for hunting. Homer noted their arrival in Asia Minor in the Iliad in 800 BC. Christopher Columbus allegedly brought mules to

4347-453: The title Tilling . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Tilling&oldid=1217496431 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Tillage Tillage that

4416-426: The warmth of the spring sun, thus delaying the planting of the next year's spring crop of corn. Zone tillage is a form of modified deep tillage in which only narrow strips are tilled, leaving soil in between the rows untilled. This type of tillage agitates the soil to help reduce soil compaction problems and to improve internal soil drainage . It is designed to only disrupt the soil in a narrow strip directly below

4485-593: Was first performed via human labor, sometimes involving slaves . Hoofed animals could also be used to till soil by trampling, in addition to pigs, whose natural instincts are to root the ground regularly if allowed to. The wooden plow was then invented. ( It is difficult to pinpoint the exact date of its invention . However, the earliest evidence of plow usage dates back to around 4000 BCE in Mesopotamia ( modern-day Iraq ) . It could be pulled with human labor, or by mule , ox , elephant , water buffalo , or

4554-434: Was found to be preparing sites for seeding, particularly in backlog areas carrying light brush and dense herbaceous growth. Rolling choppers found application in treating heavy brush but could be used only on stone-free soils. Finned drums were commonly used on jack pine–spruce cutovers on fresh brushy sites with a deep duff layer and heavy slash, and they needed to be teamed with a tractor pad unit to secure good distribution of

4623-621: Was increasing. According to J. Hall (1970), in Ontario at least, the most widely used site preparation technique was post-harvest mechanical scarification by equipment front-mounted on a bulldozer (blade, rake, V-plow, or teeth), or dragged behind a tractor (Imsett or S.F.I. scarifier, or rolling chopper). Drag type units designed and constructed by Ontario's Department of Lands and Forests used anchor chain or tractor pads separately or in combination, or were finned steel drums or barrels of various sizes and used in sets alone or combined with tractor pad or anchor chain units. J. Hall's (1970) report on

4692-431: Was reduced by 28% to 36%. The increases correlated well with the amounts of slash (both total and ≥7 cm diameter) consumed. The change in pH depends on the severity of the burn and the amount consumed; the increase can be as much as 2 units, a 100-fold change. Deficiencies of copper and iron in the foliage of white spruce on burned clearcuts in central British Columbia might be attributable to elevated pH levels. Even

4761-471: Was seen to be more important overall than trench orientation. In a Minnesota study, the N–S strips accumulated more snow but snow melted faster than on E–W strips in the first year after felling. Snow-melt was faster on strips near the centre of the strip-felled area than on border strips adjoining the intact stand. The strips, 50 feet (15.24 m) wide, alternating with uncut strips 16 feet (4.88 m) wide, were felled in

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