PHOSPHORUS AND LIME LEVELS FOR SOYBEANS AND RESIDUAL EFFECT IN RICE IN “CERRADO” SOILS OF THE STATE OF GOIÁS

Abstract

In this study are presented the results of the field experiments of phosphorous and lime levels in soybean (Glicine max. L. Merril) crops. which were planted in nine locations in the state of Goiás. It was also studied the effect of fertilizer in five of these locations on the subsequent rice crops. There was a linear effect of phosphorous in seven of the soybean experiments, with a quadratic effect of this same element in another experiment. In the rice experiments, there was a linear effect of residual phosphorous in three of the locations and a quadratic effect of calcium in one location. The best production of soybeans and rice was 1.9 times higher than the average production of these crops in Brazil in 1969, despite of a severe drought. The profit was calculated along with the relationship between the increase in value of the crops and the cost (fertilizer and lime) of producing this increase. The extra cost was justified in six places, mainly in the places where rice was planted during the second year.