Yield potential of field corn hybrids grown under conventional and minimum tillage methods in paddy field at Phetchabun Province
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Planting field corn hybrids in the paddy fields necessitates appropriate technology management in order to increase the potential for corn production in response to the demand of the animal feed industry. Yield potential of field corn hybrids grown under conventional and minimum tillage methods after rice was evaluated in a farmer’s field, Lom Sak, Phetchabun province. The experiment was arranged as a split plot in RCBD with four replications. Two tillage methods, the conventional and minimum tillage, were main plots. Sixteen field corn hybrid varieties; KSX5720, KSX5810, KSX5813, KSX5908, KSX5930, KSX5931, NSX052014, NSX042022, PAC339, CP639, S7328, DK6818, P4546, KWS8933, NS3 and SW4452 (check) were sub plot. Results revealed that plant height, ear height, days to 50% anthesis and 50% silking, root lodging, shelling percentage, moisture content, seed weight and grain yield were not significantly affected by tillage methods, but significantly different among the hybrids. It was found that yield and agronomic characteristics of field corn hybrids were not significantly affected by the interaction between tillage method and variety. All field corn hybrids had higher yield potential than that of SW4452 about 2-26% under conventional and minimum tillage methods after rice. The analysis of Costs and Returns on maize production found that the production cost of minimum tillage was lower than the convention tillage, which resulted in the return was greater than the conventional tillage. Minimum tillage could be practiced for field corn production in paddy field because minimum tillage gave higher grain yield and returns on maize production compared with the conventional tillage.
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