ÉPOCA DE APLICAÇÃO DA ADUBAÇÃO FOSFATADA EM CULTIVO CONSORCIADO DE MILHO SAFRINHA E UROCHLOA RUZIZIENSIS EM CONDIÇÕES DE CERRADO

Abstract

The objective was to evaluate the efficiency of anticipating phosphate fertilization on the development and productivity of second-crop maize intercropped with Urochloa ruziziensis under Cerrado conditions. The experiment was carried out at the Nova Terra Experimental Farm – Agricultural Bioactivation, located in the municipality of Rio Verde, Goiás. The experiment was set up in a randomized block design (RBD) in a 5x2 factorial scheme, with 10 treatments: 1) control; 2) conventional fertilization; 3) 100% fertilization in the soybean crop; 4) 100% fertilization in the maize crop; 5) 50% fertilization in the soybean crop and 50% in the maize crop. These treatments were repeated with the presence of Urochloa ruziziensis. The variables evaluated were plant height (PH) (cm); average stem diameter (ASD) (mm); shoot dry mass (SDM) (g plant-1); yield (t ha-1), thousand grain weight (TGW) (g), productivity (YLD) (t ha-1), shoot dry mass of Urochloa ruziziensis (SDM Urochloa ruziziensis) (t ha-1). The intercropping and timing of phosphate fertilization did not affect the variables PH, ASD, TGW, and SDM Urochloa ruziziensis. Conventional and 100% fertilization in the soybean were the most recommended for maize. The presence of Urochloa ruziziensis inhibited maize development under the conditions of this study.