Extension Ag Update
December 2008
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Ag Facts

Legumes as a nitrogen source – How much do they provide?
Accounting for the available nitrogen credit, you can significantly reduce your cost of production.

  • Alfalfa stand (70-100% alfalfa, 4 plants per sq. ft.)  =  100 to 190 lbs. of nitrogen per acre
  • Alfalfa stand (30-70% alfalfa, 1.5 to 4 plants per sq. ft.)  = 70 to 160 lbs. of nitrogen per acre.
  • Red clover or birdsfoot trefoil  = 80 to 130 lbs. of nitrogen per acre
  • Soybean = 1 lb of nitrogen per bushel produced, a maximum credit of 40 lbs. per acre.
Source:  ipcm.wisc.edu