Grain yield and quality of common bean cultivars in response to nitrogen

Bruno Corrêa Aires, Rogério Peres Soratto, Fernando Vieira Costa Guidorizzi

Resumo


Nitrogen (N) is the nutrient most required by common bean, and the response to N fertilization may be variable among genotypes. The objective of this work was to evaluate the N nutrition, grain yield, grain size, and crude protein concentration of common bean cultivars in response to topdressing N rates. Two experiments were con­ducted on a Typic Rodudalf, under two growth conditions (“dry” and “rainy” seasons). A randomized complete block design with a 7 × 4 factorial arrangement and four replicates was used. The treatments consisted of seven cultivars (Pérola, BRS Ametista, BRS Notável, IPR Campos Gerais, IPR Tangará, IAC Formoso, and IAC Impe­rador) and four N rates (0, 35, 70, and 140 kg ha-1). The experiments were analyzed jointly. The application of N did not affect the cycle, plant population, and number of grains per pod, but increased the leaf N concentration, number of pods per plant, grain size, and grain yield, regardless of the cultivar. The responses of common bean cultivars to N rates varied according to the growth condition, with response to N only in the “rainy” season experi­ment, under conditions of lower N and higher C/N ratio in the straw of the preceding crop. The crude protein con­centration in the grains was influenced in an inconsistent manner by the factors studied.


Texto completo:

ARTIGO COMPLETO - FULL TEXT


DOI: http://dx.doi.org/10.15361/1984-5529.2019v47n2p231-238