Response of soybeans to experimental defoliation
1943
Gibson, R.M. | Lovvorn, R.L. | Smith, B.W.
The reaction of Biloxi and Tokyo soybeans to light, medium, and severe defoliation treatments at 10-, 20-, and 30-day intervals was studied during the 1940 growing season on a Congaree sandy loam soil. The results of this single trial may be briefly summarized as follows: 1. There was a highly significant interaction between the degree and frequency of defoliation. 2. Complete defoliation at any frequency was too severe for satisfactory growth. 3. Medium defoliation treatments resulted in significantly higher leaf yields than the light or severe treatments. 4. The leaf yields of the two varieties did not differ significantly. Tokyo leaf yields were less affected by varying degrees and frequencies of defoliation than those of Biloxi. 5. Weights of stems and roots were inversely related to severity of defoliation treatments. 6. Any degree of defoliation resulted in a decrease in the weight of seed produced. Yields tended to be inversely related to the severity of the defoliation. 7. Defoliation treatments caused greater reductions in seed yields of Tokyo than of Biloxi, but Tokyo produced more beans under all treatments.
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