Evolução do índice de área foliar de cafeeiro arábica sob diferentes níveis e formas de parcelamentos de adubação

Abstract

This study aimed to evaluate over time, the leaf area index of Arabica coffee, cultivate Catiguá MG-3 under different levels and forms of fertilizer applications. The coffee was planted in May 2007, in the spacing of 2.5 x 0.6 meters. The design was a randomized block design with three replications, using an adaptation of the joint analysis of experiments, with the scheme of split plots. The two forms of installment payments, four (Nov, Dec, Jan and Feb) and 12 (monthly) applications were considered environments, the fertilization levels (30%, 80%, 130%, 180% and 230% of the recommendation N and K2O for coffee grown in sequeiros in Minas Gerais), the plots and the evaluation times (held every two months between the years 2010 and 2013) were the subplots in time. The fertilizers were used livestock urea (45% N) and potassium nitrate (13% N and 44% K2O). Models, Logistic and Gompertz, showed good fits and is indicated as quality assessors to describe the leaf area index of the coffee over time. The leaf area index is not influenced by the forms of installment payments (four twelve applications / year). Levels below 80% of fertilization with N and K recommended for non-irrigated plants restricts the growth of coffee in irrigated crops