Varietal differences in proper time of combine harvesting judging from the moisture content of soybean [Glycine max] stems and a simple method for its measurement
2002
"Kitano, J. (Mie-ken. Agricultural Technical Center, Ureshino (Japan)) | Tachibana, N. | Yokoyama, Y. "
"Soybean harvest should be operated by combine, when moisture content of soybean stems reduced to 50% or less, to present the occurrence of dirty seeds caused by combine harvesting. Then, the proper time of harvesting by combine for five soybean cultivars were dependent on the change in moisture content of their main stems, and we developed a simple method to measure the moisture content of soybean stems. Five soybean cultivars were used i, e, Enrei, Ootsuru, Tachinagaha, Tamahomare and Fukuyutaka. When the relation between the stems moisture and the fissure pod rate after matured stage, and the relation between the accumulated temperature after matured stage and the stems moisture content, and the fissure pod rate were compared, varietal differences were found in any relationship. Proper time of combine harvesting could be shown, as mentioned hereunder, by the accumulated temperature after the matured stage and the mumber of days after maturity date. That is; 80-300 degree/days or 6-17 days for Ooturu, 60-250 degree/days or 4-14 days for Tatinagaha, 60-300 degree/days or 4-19 days for tamahomare, and 0-250 degree/days or 0-17 days for Fukuyutaka, respectively. The method of measuring stem moisture by using the moisture meter for soybean grains, a high frequency capacity type, was devised. This method simply applicable in actual fields made the judgment of harvesting time."
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