Inoculation methods and nitrogen fertilizer effects on soybeans in the tropics; dry matter and seed yields
1987
Pasaribu, D. | Morris, R.A. | Torres, R.O. (The International Rice Research Institute, Manila (Philippines). Multiple Cropping Dept.)
The effects of N fertilizer and Rhizobium japonicum inoculation on soybean growth and grain yield were determined on Philippine paddy fields differing in off-season soybean cropping history. Nitrogen fertilizer treatments were: 0, 20 or 25, and 80 or 50 kg/ha applied at planting. Inoculation treatments were: no inoculation, seed-inoculation, seed-and-furrow inoculation. Regardless of cropping history, N fertilizer increased dry matter yield, leaf area and grain yield. On a field never previously cropped with soybeans in the post-rice seasons, seed inoculation and seed-and-furrow inoculation increased grain yield by 65 % over uninoculated treatments. Despite responses to both factors, the best treatments at the respective locations produced grain yields of only 1.2-1.3 tons/ha. Fertilizer and inoculation management practices which will increase N assimilation more than those tested in this study are a prerequisite for substantial yield increases of soybeans cultivated during the post-paddy rice season
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