Responses of soybean to irrigation amounts and plant arrangements
1997
Wanchai Thanomsub | Kanokporn Maolanont | Thewa Maolanont (Department of Agriculture, Bangkok (Thailand). Chai Nat Field Crops Research Centre)
Major factors related to crop growth and yield, particularly in the dry season, are water availability and planting method, when other factors such as fertility, diseases etc., do not limit growth and yield. The effects of irrigation amounts and plant arrangements on soybean, CV. Nakhon Sawan 1, were investigated at Chai Nat Field Crop Research Centre in the 1994/95 and 1995/96 growing seasons. The responses of soybean to irrigation amounts and plant arrangements between the two seasons were similar. There were no interactions in growth and yield between irrigation levels and plant arrangements. Leaf area index, leaf area duration and crop growth rate significantly increased with increasing irrigation amounts from IW/E (ratio of irrigation water to evaporation) 0.3 to 0.7. Similarly, seed yield favoured higher ratios of lW/E (up to 62 percent). Pods/plant and seed weight were major factors determining yield differences among irrigation levels. However, there was not significant differences in seed yields and yield components between IW/E 0.7 and 0.9. Square planting gave the highest yield (up to 14 percent), whereas 5:1 and 10:1 rectangularity produced no significant difference in seed yield. Higher yield of square planting was mainly due to higher number of pods/plant.
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