Investigations with the castor-bean plant. III. Fertilizers, clipping, method of planting, and time of harvest
1945
Domingo, W.E. | Crooks, D.M.
1. Eight fertilizer tests in Kansas, Kentucky, Mississippi, Missouri, and Oklahoma failed to show any marked yield increase from nitrogen, phosphorus, or potassium, either alone or in combination, on the Conner variety of castor beans. The only significant increase from any treatment was with phosphorus alone at Princeton, Ky. In the same test phosphorus with nitrogen and potassium produced no such increase. 2. Clipping the stem from young plants above the fourth to the thirteenth nodes in two tests in 1943 increased branching as expected, but yields of treated plants were materially reduced, largely because of delayed maturity. 3. Surface-planted plots yielded somewhat more than listed plots in two small tests in Kansas. The differences, however, were not great and the method used should probably be governed by the equipment available. Weed control was much easier in the listed plots. In certain years planting in cold soil in lister furrows might affect yields adversely. 4. In general, delaying harvest of the three common varieties of castor beans until frost in three tests in 1943 resulted in significant loss of seed by shattering. On the other hand, yields were only slightly different from plots harvested frequently enough to get all of the seed and from plots harvested only when serious loss seemed imminent.
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