Author : Payonga, Antonio P.

Summary : A study to determine the productivity of corn with winged beans and lima beans as rotation crops with and without alley was conducted at Balogo, oas, Albay, from January, 1996 to May 1997. Four crop rotations (corn-fallow-corn, corn-winged beans-corn, corn/winged beans corn, corn-lima beans-corn) were used to determine their effects on soil properties, crop growth, grain yield and its components, nutrient uptake, soil loss and surface runoff. The study was laid out in Ramdomized Complete Block Design (RCBD) with three replications. The different crop rotations did not alter N, P, and K, organic matter and cation exchange capacity (CEC) at 0-15 cm layer with and without alley, although, these soil properties decreased over time. The significantly high reduction in percentage N and organic matter with alley indicates that more nutrients are taken by corn plants The utilization of winged beans and lima beans as rotation crops resulted to a decreased exchangeable K. The decrease, however, was higher with than without alley. The Gliricidia prunings contributed to the soil K content and not to the organic matter, N, P, and CEC.