Publicação: NITROGEN ACCUMULATION AND EXPORT BY COMMON BEAN AS A FUNCTION OF STRAW AND N SPLITTING IN NO-TILLAGE SYSTEM
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Univ Fed Rural Semi-arido-ufersa
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Resumo
Determining nitrogen (N) accumulation and export by common bean as a function of straw and of the splitting of this nutrient is very important, aiming at the management and sustainability of agricultural systems. This study aimed to determine the N accumulation and export by common bean as a function of Zea mays and Urochloa ruziziensis grass straw (maize, maize/U. ruziziensis intercropping and U. ruziziensis) and splitting of top-dressing N fertilization. The experiment was conducted in Jaboticabal-SP-Brazil, during the 2012/13 crop season, in a Red Eutrophic Oxisol (Eutrudox) in no-tillage under irrigation. The experimental design was a randomized block with split plots with four replicates, totaling 120 subplots sized in 25m(2) each. The plots consisted of the cropping systems prior to common bean: maize, maize/U. ruziziensis intercropping and U. ruziziensis. The subplots were composed of ten top-dressing N fertilization splitting schemes (NS) at the phenological stages V3, V4 and R5 in different combinations. Common bean grain yield differs among cropping systems and as a function of top-dressed N split application. U. ruziziensis grass as single crop promotes greater N accumulation in common bean shoots compared to maize and its intercropping with U. ruziziensis grass. Regardless the cropping system, top-dressing N application in a single dose (90 kg ha(-1)) at V-4 leads to similar accumulations and exports to those found in the absence of N fertilization. Splitting schemes with N application at the R-5 stage increase the exports of this nutrient by common bean in succession to maize and its intercropping with U. ruziziensis grass.
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Phaseolus vulgaris, Plant mineral nutrition, Conservation agriculture
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Inglês
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Revista Caatinga. Mossoro: Univ Fed Rural Semi-arido-ufersa, v. 34, n. 1, p. 108-118, 2021.
