Effect of Cropping System on the Soil Fertility, Crop Yield and Farmers Income
Lee, W. H.
This study was conducted form 1986 to 1990 in the paddy field located in Lutsao, Chiayi. The purpose of this study is to discuss the effect of rice and upland crop rotation systems on the soil physical property, soil fertility, crop yield and farmer’s income. The rice-upland crop rotation systems included: (A) rice-rice (check), (B) rice-soybean-corn, (C) rice-sesbania-con, (D) soybean-rice-corn, (E) sorghum-ratoon sorghum-corn, (F) sorghum-soybean-corn. The results of the 5-year experiments revealed that rice rotated with upland crops could improve soil physical property, increase soil phosphorus content and crop productivity. Rotation with sesbania increased yield of rice grain by 3%, corn kernel in fall crop by 31%. Sorghum rotated with soybean could increase sorghum grain yield by 22%. From the consideration based on the availability of farmer labor, the utilization of water sources, crop yield and the farmer’s profit, the proper or recommended rotation systems were: rice-soybean-corn; rice-sesbania-corn and sorghum-soybean-corn, their net returns were increased by 42%, 39% and 30%, respectively, as compared with rice rotated with rice. The above rotation systems could be served as reference for the more efficient use of water source supply, and adjustment of paddy field utilization.
Accepted for publication: December 23, 1991.