Effects of irrigation intervals on growth and yield of soybean
2000
Songyot Tanphiphat | Uma Saengkhram
Effects of the frequency of watering (2- 5- and 7- day intervals) beginning form 20 and 35 days after emergence (DAE) on growth and yields of three soybean varieties: SJ. 4, CM1 and KMITL soy 1 were investigated. The results showed that watering every 5 or 7 days at 20 DAE decreased number of branches, number of nodes and leaf area more than those which were watered at 35 DAE. Dry weight of stem, branch and leaf per plant of soybean watered every 5 and 7 days were lower than control (watering every 2 dyas) at 65 days harvesting period. In addition, watering every 5 or 7 days reduced the number and increased the abortion ppercentage of flower and caused dry matter of reproductive growth reduction. Soybeans which were watered every 7 days had dry matter of reproductive growth less than those of watering every 5 days. Soybeans which were watered every 7 days after 20 and 35 DAE produced less seed yield per plant when compared with watering every 5 days. Yield components were reduced when water deficit occurred, particularly number of pod per plant and seed dry weight (100 seeds) but number of seed per pod was less deviated. Comparing among three varieties, CM1 gave the highest yield, followed by SJ.4 and KMITL soy 1, respectively.
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