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| Filter results3 paper(s) found. |
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1. Phosphorus Runoff From Incorporated and Surface-Applied Fertilizer and ManureContinued inputs of fertiher and manure in excess of crop requirements have led to a build-up of soil phosphorus (I?) levels, creating an environmental rather than agronomic concern (Sharpley et al., 1994). The objective of this study was to evaluate the effects of soil test P level, source of P amendments, tillage, and manure application method on P runoff from agricultural soils. The treatments consisted of swine manure surface applied and injected at rates of 29 and 59 Ib acre-' of P, and triple... |
2. Soil Phosphorus Spatial Distribution in Pastures Receiving Poultry Litter ApplicationsEnvironmentally-based P management strategies could be improved by debeating management zones incorporating the effects of landscape position on soil morphology, hydrology, and soil P distribution. Three farm pasture sites in SW Missouri receiving long-term poultry litter applications were sampled by landscape position (summit, shoulder, upper backslope. middle backslope, lower backslope, footslope, drain) for soil P (Bray 1 P, CaCl2 P, total P) at two depths (0-5 cm, 5- 15 cm). Low landscape positions... |
3. Can Co-additives Alter the Phosphorus Fertilizer Reaction Pathways in P-Fixing Soils?In many calcareous and strongly weathered acid soils, only a small proportion of applied fertilizer P is available for plants in the year of application due to rapid transformation of applied P to insoluble forms (“fixed” P) with limited plantavailability. The residual effectiveness of applied P fertilizer decline over time due to further transformation of applied P to more insoluble forms. High nutrient loading intended to overcome P availability limitations in high P-fixing... G. Hettiarachchi |