Describe the general pattern of the relationship between levels of plant-available phosphorus (or any fertilizer-applied nutrient) in soils (as determined by a soil test) and (a) crop growth and yield; (b) the potential for off-site impacts due to surface runoff; and (c) leaching losses to groundwater.
(a) Crop growth and yield versus soil-test P levels. (b) Potential for off-site impacts due to surface runoff. (c) Potential for leaching losses to groundwater. (d) Would you expect the relevant pattern for off-site impacts and leaching to groundwater to differ between N and P? Why?
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