soil survey, nitrogen, crops, legumes
1. Nitrogen is necessary for the growth of crops.
2. Nitrogen is disappearing from cultivated soils.
3. Maintain the nitrogen supply by growing legume crops.
a. See to it that the soil is not sour.
b. Inoculate the seed.
4. Don’t burn stalks or straw, because
a. A ton of wheat straw contains $4 worth of nitrogen.
b. A ton of oats straw contains $4.80 worth of nitrogen.
c. A ton of corn stalks contains $6.40 worth of nitrogen.
South Dakota State State College of Agriculture and Mechanic Arts, Agricultural Experiment Station
Hutton, J. G., "Soil Survey Circular No. 1: Nitrogen From the Air" (1920). Agricultural Experiment Station Circulars. 1.