INFLUÊNCIA DA ADUBAÇÃO FOSFATADA NA PRODUÇÃO DE CULTIVARES DE ALFACE NO SUDOESTE GOIANO

Abstract

In the literature, there are few studies that evidence the behavior of sources and phosphorus levels in the soil for the cerrado region of Goiás. Thus, the objective of this work was to evaluate the behavior of lettuce cultivars as a function of different phosphate sources applied via soil. The experimental design used was in randomized blocks in a 2x3x5 factorial, totaling 30 treatments, corresponding to 2 lettuce cultivars [Americana (A) cv. Lucy Brown and Crespa (C) cv. Vanda] submitted to 3 phosphate sources [MAP, Polyblen and Super Triple Phosphate (SPT)], which are in 5 concentrations [0, 250, 500, 750 and 1000 kg of P2O5 ha-1], in 3 replications. The variables were analyzed 40 days after planting. With the mean data of the evaluated characteristics, variance analysis (F test) was performed according to the proposed design, and the polynomial regression analysis, opting for the equation of greater significant adjustment, in the sequence the data were also evaluated by multivariate tools. The statistical programs Rbio and R. At the end of the experiment it was possible to conclude that the phosphate sources and their phosphorus levels influenced the behavior of lettuce cultivars. The phosphate sources were not very expressive for the production components of lettuce cultivars, and p2O5 doses were recommended for study conditions, ranging from 500 to 700 kg, for high yields. The multivariate analysis was efficient in elucidating the information generated at work.