Associated legumes in an intrarow intercropping system improved corn grain yield in the current year
1989
Ed Sarobol | Vichan Vichukit | Somsak Rodlong (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Experiment was carried out at the Suwanwajokkasikij Research Station, Amphoe Pakchong, Nakhon Ratchasima Province during December 1988 - April 1989 (dry season 1989) and August 1989 - December 1989 (late rainy season 1989). Treatments were 1) corn + 16-20-0 fertilizer 0 kg/rai (T1), 2) corn + 16-20-0 fertilizer 15 kg/rai (93.75 kg/ha) (T2), 3) corn + 16-20-0 fertilizer 30 kg/rai (187.50 kg/ha) (T3), 4) corn + lablab (Lablab purpureus L.) (T4), 5) corn + thornless mimosa (Mimosa invisa L.) (T5), 6) corn + lablab (Legume is cut and used as green manure (T6), 7) corn + thornless mimosa (legume is cut and used as green manure) (T7). The legumes in T6 and T7 were cut at tasselling stage of corn. In the dry season 1989, grain yields of corn from T1, T2 and T3 were greater than the other treatments. For the late rainy season 1989, the results showed that corn in T6 and T7 outyielded the others. When the data were combined, the results clearly revealed that associated legumes improved grain yield of intercropped corn in the current year. The greatest grain yield, 5059 kg/ha, was obtained from corn intercropped with lablab and the legume was cut and used as green manure followed by grain yield of corn intercropped with thornless mimosa and the legume was cut and used as green manure (4659 kg/ha). Corn grain yield from plots fertilized with 16-20-0 fertilized at the rate of 0, 93.75 and 187.50 kg/ha were 4162, 4316 and 4404 kg/ha, respectively.
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