Study on appropriate cultural practices affecting increased grain yield of soybean grown after rice in the upper north
1996
Charoon Aaree | Viroj VaJananawat | Daen Fusaeng | Malee Pungchareon | Nopphon Thongpleo | Somyot Wilaisat (Department of Agriculture, Bangkok (Thailand). Field Crops Research Inst. Chiang Mai Field Crops Research Center)
Objective of this study was to develop soybean production technologies responsible for yield and quality improvement and increases in gross returns. A number of experiments were conducted in a sandy clay loam paddy soil at Tambol Papai, Sansai District, Chiang Mai Province between 1993-1995. The experiments were assigned in RCBD consisting of 7 treatments, with 4 replications. Soybean cv. CM60 was sown at a spacing of 25 cm x 25 cm, in a 3x5 sq.m. plot. Under rice soybean cropping system in this area, the farmers apply chemical fertilizer to rice and grow soybean after harvesting. The experimental results indicated that the number of plants per rai of 128,000 or equivalent to 5-6 seedlings per hill with 25cm x 25cm spacing, and inoculating rhizobium before planting produced a high reasonable yield relative to the cost of production. The application of herbicide (fluazifop-p-butyl) at the rate of 24 g a.i./rai at 15-20 DAP to control narrow leaf weeds gave significantly higher yield and marginal rate of return. For seed production, chemical fertilizer grade 12-24-12 should be applied at the rate of 10 kg/rai in order to improve seed yield and quality. However, the application of Chemical fertilizer led to some greenish yellow seed.
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