Estabelecimento de normas dris para bananeira 'Prata Anã' (AAB) sob irrigação

Abstract

The objective of this work was to establish the DRIS (diagnosis and recommendations integrated system ) norms for the 'Prata Anã' banana (AAB) cultivated in the semi-arid of the North of Minas Gerais state under irrigation. A total of 58 areas commercially cultivated with 'Prata Anã' banana were selected. In each area, leaves samples were collected in three successive cycles of banana production in the initial phase of emission of the bunch, except for six areas, in which the collections were performed only in two successive cycles, totaling 168 leaves samples, which were analyzed for determination of the nutrients (N, P, K, Ca, Mg, S, B, Cu, Fe, Mn and Zn). Banana's bunches of the plants marked with paint were harvested and weighted. The areas were divided in high-yielding population (HYP) (>30 t ha-1 year-1) and in low-yielding population (LYP) (< 30 t ha-1year-1). The results of the leaves analyses and yield of each area formed a database. The average, the variance and the variation coefficient for the relationship two to two among nutrients tenors were calculated for HYP and LYP. The Norms DRIS were established using the results of the leaves analyses of coming samples of HYP. 55 relationship were selected among nutrients tenors that presented the largest reasons between the variances of LYP and HYP (s2l/s2h ).