Utilization of nitrogen fixation in production of some cash crops in the Northern Region [Thailand]
1990
Ampan Bhromsiri (Chiang Mai Univ., Chiang Mai (Thailand). Faculty of Agriculture. Dept. of Soil science and Conservation)
Utilization of biological nitrogen fixation in soybean and rice production of the Northern region were discussed. In the traditional soybean growing areas, about 44 percent of the farmers in the irrigated zone use rhizobial inoculant, those in the rainfed area do not inoculated their fields. Non significant responses of soybean to rhizobial inoculation in these areas have been reported. The non responsive inoculation was due to the high population of effective indigenous rhizobial strains in the soils. In the new cultivated area, nodulation and yield improvement of soybean could be achieved by rhizobial inoculation. However, duration and amount of rainfall after sowing of the inoculated seeds are two factors influencing the successful responses of soybean in the rainfed upland area. Benificial effects of azolla utilization on rice yield and soil improvement were reported. Some limitations for the azolla usage and suggestion were discussed.
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