Crop rotation is an essential practice in vegetable production to control pests and diseases and it has also been used to recover residual fertilizer. This work aimed to evaluate the residual effect of organic fertilization of okra on yield of green corn ears in a subsequent cultivation. Okra was sown in two plant populations and fertilized with liquid swine biofertilizer at the rates: 0, 6, 12, 24, and 48 m³ ha-1. After removing the crop from the area, corn seeds of hybrid AG 1051 and variety UFVM 100 were sown in double lines, at the spacing of 1.0x0.40 m, with 0.25 m between plants after thinning. The experiment was arranged in a randomized block design with four replications, using a 2 x 5 factorial scheme with two corn cultivars and five rates of liquid swine biofertilizer. The residual fertilizer of the swine biofertilizer applied to okra was insufficient to meet green corn crop requirements, hence a lower commercial yield was recorded. Green corn cultivated in succession to okra aiming at crop rotation and utilization of residual organic fertilization is a promising practice, but supply of N and K through supplemental fertilizing by top-dressing of biofertilizer is necessary. The hybrid AG 1051 showed higher plant height, number and yield of commercial ears without straw and mean weight of non-commercial ears. The variety UFVM100 showed higher P and K contents in the leaves, number of ears with straw, number and yield of commercial ears without straw.
Zea mays L.; Abelmoschus esculentus L.Moench; swine biofertilizer; residual organic fertilizer; crop rotation
