Nitrate Accumulations in Forage Crops1
- L. S. Murphy and
- G. E. Smith2
The effects of N and P fertilization rates and stage of plant maturity on the nitrate-N content of nine forage species were studied over a 2-year period. Species included in the investigations were orchardgrass, tall fescue, bromegrass, bluegrass, timothy, sudangrass, wheat, alfalfa, and ladino clover. Nitrate-N was determined on hot water extracts of dried plant material by the phenoldisulfonic acid method.
Of the species under study, sudangrass accumulated nitrate-N to the greatest extent. It was closely followed by orchardgrass and fescue. Bromegrass, timothy, and ladino clover accumulated intermediate amounts of nitrate-N. Alfalfa and wheat accumulated little of this form of nitrogen.
Increased N fertilization had a direct effect on nitrate-N accumulation. Phosphorus fertilization had little if any effect upon the nitrate-N contents of the various species.
Advancing plant maturity was associated with a decline in the nitrate-N content of most species.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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