CRESCIMENTO VEGETATIVO E PRODUTIVIDADE DE MAMONEIRA EM FUNÇÃO DA VARIEDADE E DA ADUBAÇÃO FOSFATADA

Abstract

Having to evaluate the effect of varieties and phosphorus fertilization on growth and productivity of castor beans, is an experiment conducted at the Center for Agricultural Sciences, located in Rio Largo- AL. The paper was a 5 x 2 factorial, consisting of five doses of P2O5 (0, 45, 90, 135 e 180 kg ha-1) using triple superphosphate as source, and two varieties of castor bean, (BRS 149 Nordestina and BRS 188 Paraguaçu), with the treatments distributed in a randomized block design with four replications. We determined leaf area (LA) and plant height (PH) 30, 60, 90 and 120 days after transplanting (DAT), the length of the primary racemes (LPR) and subsequent (LSR), the number of racemes throughout the cycle (NR), the seed yield (SY) and dry matter accumulation in shoot (DM). The P fertilization increased the leaf area only at 30 and 120 DAT, while for plant height, the effect was only observed at 30 DAT. There was a quadratic effect of phosphorus for the LPR, NR, SY and DM. The variety BRS 188 Paraguaçu produced more racemes, but on the other side of the racemes BRS 149 Nordestina were longer.