Potential productivity and risks of different cropping patterns under rainfed conditions at Maros, South Sulawesi, Indonesia
1990
Padjung, R.
Three modules of Macros model, L1D, L2C and L2SS were used to simulate the growth and yield of two rice varieties, soybean, corn, cowpea, and peanut to determine the potential productivity of such crops at different planting dates under rainfed condition at Maros; to quantify the risk of different cropping patterns; and to determine the most feasible cropping pattern for rainfed riceland area at Maros [South Sulawesi, Indonesia]. Hydraulic properties of the soil based on soil survey report and direct measurement of soil samples done at IRRI [International Rice Research Institute, Los Banos, Laguna, Philippines], along with daily historic climate data of 15 years of Maros were used to run the model. The simulation showed that soybean, corn, and cowpea is less feasible to be grown as pre-rice crop. Mean simulated yield of these crops at different planting dates ranged from 0 to 1.22, 0 to 0.11, and 1.26 to 4.59 ton/ha, respectively. Double-cropped rice is feasible, but the second crop will be prone to tungro disease. Soybean, peanut, and cowpea can be possibly grown after rice. To accommodate these crops, rice should be transplanted between December 16 to January 16 so that the upland crops are sown on April 1, May 1, and May 16 for soybean, cowpea and peanut, respectively. Simulated yields at this planting date were 5.84 to 6.76 ton/ha for rice and 2.51, 0.66, and 2.02 ton/ha for soybean, cowpea, and peanut, respectively.
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