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Studies of soybeans and other green manure crops for sugarcane plantations

Arceneaux, G., McKaig, N. Jr., Stokes, I.E.
Agronomy journal 1932 v.24 no.5 pp. 354-363
Saccharum officinarum, Glycine max, Crotalaria juncea, crop yield, plant-water relations, nitrogen content, planting date, harvest date, green manures, developmental stages, provenance, Louisiana
Experiments were conducted at the U.S. Sugar Plant Field Station, in Terribonne Parish, near Houma, La., in 1930, to determine the fresh weight, dry weight, and nitrogen content of several legume crops when planted on different dates and at different rates of seeding and harvested at varying stages of maturity. The data indicate the following: In the sugarcane rotation, soybeans should be planted in the early spring for the best results. Soybeans yield the maximum green matter, dry matter, and nitrogen per acre when they are in the full bloom stage. With early-planted Biloxi this stage was attained between August 1 and 15. The Biloxi variety appears to be a better variety than Otootan for green manuring purposes. Crotalaria juncea reached its optimum stage for turning under about 110 days after planting, this period corresponding approximately to the full bloom stage. This plant makes a very rapid and satisfactory growth. The most satisfactory rate of planting Biloxi soybeans is from 25 to 35 pounds and for Otootan about 20 pounds per acre. Among several legumes new to Louisiana, Cajanus indicus, Crotalaria usaramoensis, C. anagyroides, and Centrosema plumieri show promise as green manure crops.