Nitrogen in Missouri soils
Abstract
"Missouri soils commonly contain from 1,000 to 6,000 pounds of organic nitrogen. This nitrogen is made slowly available for plant use by the breakdown of stable organic matter (humus). Research in Missouri has shown that 1,000 pounds of organic nitrogen in the soil releases only about 20 pounds of nitrogen for crop use. As a result, additional nitrogen in the form of fertilizer or manure is needed on nonlegume crops grown in Missouri."--First page.
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