EFFECTS OF WATER STRESS ON SOYBEAN YIELD
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Abstract
The experiment described was conducted at the Faculty of Agriculture, Chiang Mai University, during January-April 1986, Three plant densities, 10x50 cm, 20x50 cm and 30x50 cm of soybean (S.J.5) were investigated under four irrigation regimes, at weekly, two-weekly and three-weekly intervals. The latter treatment was divided into two practices at different stages of plant growth.
Seed yield responded well to irrigation, with a significant increase in yield at the highest irrigation frequency. Differences in yields after three-weekly interval treatments were not observed. Increasing seed yields due to increasing plant densities were only observed for the two most frequent irrigation treatments. Yields of up to 2.6 t/ha were achieved from the most frequently irrigated systems with the highest plant density. The more frequent the irrigation, the higher the number of pods per plant and seed weight. The leaf water potential and soil moisture content during the experiment were also recorded and are discussed in this report
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