SOURCES AND DOSES OF NITROGEN AND PHOSPORUS IN NO TILL COMMON BEANS

Abstract

The objective of this study was to evaluate the effect of doses and sources of nitrogen and phosphorus, on the production components and grain yield, on irrigated common beans cultivated in a Cerrado area of Selvíria, Mato Grosso do Sul State, Brazil (20°22’S, 51°22’W, altitude 335 m). The experimental design was a randomized block, with 4 doses of top-dressed N (0 kg ha^-1, 40 kg ha^-1, 80 kg ha^-1, and 120 kg ha^-1) and 2 sources (urea and coated urea), and 4 doses of phosphorus (0 kg ha^-1, 50 kg ha^-1, 100 kg ha^-1, and 150 kg ha^-1 of P₂O₅) and 2 sources (triple super phosphate and coated triple super phosphate), at sowing, with 4 repetitions. Nitrogen and phosphorus content in leaves, pod/plant number, grain/plant number, mass of 100 grains, and grain yield were evaluated. The sources of N, as well as the sources of P₂O₅, did not differ, as related to the number of pods per plant, grains per plant, mass of 100 grains, and grain yield. The doses of N influenced linearly the leaf N content, as well as the grain yield. The doses of P increased linearly the leaf P content and the grain yield, up to the 120 kg ha^-1 dose.

KEY-WORDS: Phaseolus vulgaris L.; coated fertilizer; Cerrado.