Fertilizer trials on corn and soybean intercropping system in clay loam soils
1998
Pradit Boonampol(Department of Agriculture, Bangkok (Thailand). Soil Science Division) | Santi Teeraporn(Department of Agriculture, Bangkok (Thailand). Soil Science Division)
Brown Forest soils in Kumpangpet area possesess medium to high fertility soil status. Corn and soybean could be potentially produced high yield as sole crop. However, proper cropping patterns such as corn //soybean intercropping system together with 0-0-0, 5-10-5, 10-10-5 and 20-10-5 kg/rai N-P2O5-K2O were assigned to corn and 0-9-6 kg/rai to soybean, Corn and soybean produced 527 and 207 kg/rai, respectively when they were grown as sole corp with 10-10-5 and 0-9-6 kg/rai fertilizer application rates, respectively. The highest LER value was 1.7 which was obtained from Corn//soybean intercropping system under 20-10-5 kg/rai applied to corn and 0-9-6 kg/rai to soybean. The highest yield of both crops were 501 and 162 kg/rai under such fertilizer application rates. Economic return from the system revealed most effective when they were grown under high initial soil fertile regardless the fertilizer application. The addition of growth factor inputs resulted least profit under such circumstances. Initial soil fertility status must be take into consideration before assigning the cropping patterns and fertilizer programs.
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