منابع مشابه
Fisher and Bradford Hill: theory and pragmatism?
provided the theoretical underpinning for tests of statistical significance.1 Because of this, it is often assumed that Fisher must have played a key role in the evolution of randomized trials in medicine during the 1930s and 1940s. Randomization was adopted by Austin Bradford Hill for Medical Research Council (MRC) trials for a more pragmatic reason, however. Bradford Hill was aware that an al...
متن کاملReview of factors determining legumes sod-seeding outcome during pasture renovation in North America
Pasture renovation entails introduction of desirable forage species, usually legumes such as red clover (Trifolium pratense L.), white clover (Trifolium repens L.) or birdsfoot trefoil (Lotus corniculatus L.), into a grass dominated pasture. A commonly used method of pasture renovation consists in drilling seeds into the grass sod (sod-seeding). Introduced legumes benefit the pasture in three w...
متن کاملEffects of pasture renovation on hydrology, nutrient runoff, and forage yield.
Proper pasture management is important in promoting optimal forage growth and reducing runoff and nutrient loss. Pasture renovation is a management tool that improves aeration by mechanically creating holes or pockets within the soil. Pasture renovation was performed before manure application (poultry litter or swine slurry) on different pasture soils and rainfall simulations were conducted to ...
متن کاملFORAGES AND PASTURE MANAGEMENT Herbage Productivity and Botanical Composition of Hill Pasture as a Function of Clipping and Site Features
factors influencing the distribution of prairie species in complex terrain in central Canada (Lieffers and LarkinComplex topography and varied soil of hill-land pastures create Lieffers, 1987). Slope aspect also influenced diversity microsite conditions that support an array of floristic associations and herbage production patterns. This complicates management for forage of naturalized flora oc...
متن کاملCheck the Soil Yield Stress in Situations with different Slope on a Hill Slope with Pasture Cover with the Occurrence Sulification Erosion
One of the most important types of water erosion, is massive erosion. Soils with fine particles (especially silt particles) have little stability against erosion, because they have more water holding capacity and thus increase the saturation moisture and the likelihood of this type of erosion. So In this study, to investigate the relationship between particle size of silt, with behavior and rhe...
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ژورنال
عنوان ژورنال: Proceedings of the New Zealand Grassland Association
سال: 1989
ISSN: 1179-4577,0369-3902
DOI: 10.33584/jnzg.1989.50.1875