Nutrição mineral do feijoeiro em influência de nitrogênio e palhadas de milheto solteiro e consorciado com feijão-de-porco

Abstract

RESUMO.O objetivo foi avaliar o efeito das palhadas de milheto (Pennisetum typhoides (Burm.) Stapf) e milheto + feijão-de-porco (Canavalia ensiformes (L.) DC.) e diferentes doses de nitrogênio, na nutrição mineral do feijoeiro. O delineamento foi em blocos casualizados, com quatro repetições, em esquema de parcelas subdivididas, em Latossolo Vermelho, em plantio direto. As parcelas foram constituídas pelas palhadas e as subparcelas por um fatorial 2 x 4 + 1, representado por duas doses de N na semeadura (30 e 60 kg ha de N na semeadura, sem cobertura, com inoculação das sementes com Rhizobium tropici e aplicação foliar de Co e Mo. A palhada de milheto + feijão-de-porco proporcionou maiores teores foliares de N e Mg. A cobertura nitrogenada aumentou o teor do nutriente até a dose de 116 kg ha -1 , proporcionando incrementos lineares nos teores de K e S. Para os teores de Mg houve interação tripla. O tratamento adicional aumentou o teor de N sob palhada de milheto, os teores de K e Cu e o rendimento de grãos sob ambas palhadas e reduziu os teores de Ca e Mg, sob palhadas de milheto e milheto + feijão-de-porco, respectivamente. As doses de N em cobertura aumentaram o rendimento de grãos em ambas as doses de base, com maior resposta na de 30 kg ha ABSTRACT. Bean mineral nutrition influenced by nitrogen and straws of millet and millet plus jack bean intercropping. This study was carried out to evaluate the effect of straws of millet (Pennisetum typhoides (Burm.) Stapf) and millet plus jack bean (Canavalia ensiformes (L.) DC.) intercropping and nitrogen fertilization levels on bean mineral nutrition in a no-till system. The experiment was carried out in a randomized blocks design and four replications in a split-plot arrangement, with the straws in the plots and nitrogen levels at sowing (30 and 60 kg ha -1) and at topdressing (0, 40, 80 and 120 kg ha -1

Seed inoculation with Azospirillum brasilense and N fertilization of corn in the Cerrado biome

“…Thus, foliar Ca decreases in the presence of ammonia nitrogen, as observed in this study, because urea is biologically converted to ammoniated form (Kamowaga et al, 2000). Teixeira et al (2010), evaluating the effect of N doses and millet mulch on bean crop, found the highest Ca content for the highest N dose applied at planting, (60 kg ha -1 ). These results contradict the results obtained in our study, which may be due to accelerated mineralization of organic matter caused by high N levels in the planting row.…”

Absorption, Accumulation and Export of Macronutrients by Common Bean Irrigated, and Influenced by Nitrogen Fertilization

“…Teixeira et al (2010) observed that the application of N in sidedressing (0-120 kg ha -1 ) promoted linear increments in the N and Mg contents in beans with no-tillage and Rajesh et al (2011a) showed N increase in shoot. According to Kikuti et al (2006) the fertilization with N and P in bean BRS-MG Talismã increase N, P and K content in leaves and petioles, and, decrease K and sulphur (S) content in flowers and strings but the nutritional contents still remained in the level considered as adequate.…”

“…Nitrogen is one of the main nutrients by beans, especially for increasing the productivity and production of biomass (Lima et al, 2001;Nascimento et al, 2009;Teixeira et al, 2010;Albuquerque et al, 2012;Maia et al, 2012) and nutrient absorption (Fageria & Baligar, 2005;Teixeira et al, 2010). Teixeira et al (2010) observed that the application of N in sidedressing (0-120 kg ha -1 ) promoted linear increments in the N and Mg contents in beans with no-tillage and Rajesh et al (2011a) showed N increase in shoot.…”