Thesis Abstract of AGS Students

Bantau Junpoom (1991)

The on-farm experiment was conducted to evaluate soybean variety-fetilizer package and to define recommendation domain for post-rainy season soybean in a rainfed upland. The site at Land Reform Area at Chom Thong, Chiang Mai was selected. Twelve farmers whose farms located on the upper and lower terraces were chosen to test a set of soybean technology consisting of two varieties, SJ 5 and CM 60, and three levels of fertilizer input, 0-0-0, 1.5-4.5-3.0, 3.0-9.0-6.0 (N-P2O5-K2O) kg/rai in wet season, 1989. The factorial experiment was arranged in a randomized complete block design with two replications at each farm. Additional thirty farmers were interviewed to study the farmer management practices and resource use for soybean production.

The experimental results showed that there was no yield difference between soybean grown on the upper and lower terraces. The soybean variety CM 60 was superior to SJ 5 at all environments, fertilized and unfertilized, providing average seed yields of 184 and 156 kg/rai, respectively. An economic analysis of the treatment combinations indicated that CM 60 and fertilizer application of 1.5-4.5-3.0 (N-P2O5-K2O) kg/rai was the most profitable package. Therefore based on modified stability analysis of the variety-fertilizer combinations, one common recommendation was suggested.

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