Foliar feeding is a complex subject, but in general it allows you to supply small amounts of deficient elements to plants (through their leaves, primarily) at the time they need them. Fertilizers applied to the soil before planting may not be available to the plants when they need them most—during peak growth and pod fill. […]
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Manures are an excellent source of nitrogen.
Soybean production factors out as follows: a 50-bushel crop takes 280 pounds of nitrogen.
When limestone is put on the soil, it accepts acidity from the clay, just as other minerals do in the rock weathering processes.
Toxic substances not only come from pesticides (herbicides and insecticides), but also are produced by anaerobic bacteria in tight or waterlogged soil, and from certain harmful fertilizers.
It is a big mistake to consider that just adding enough fertilizer to grow the crop is what determines soil fertility.