Technical and agronomic efficiency of nitrogen use on the yield and quality of oat grains/Eficiencia tecnica e agronomica do nitrogenio na produtividade e qualidade de graos de aveia.

Citation metadata

Publisher: ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior
Document Type: Article
Length: 4,749 words

Document controls

Main content

Abstract :

HIGHLIGHTS: Sustainable cultivation management of oats should consider the efficiency of nitrogen in association with weather conditions. Technical efficiency of nitrogen use showed doses that certify greater economic return with reduced environmental impact. Agronomic efficiency of nitrogen indicated an unstable increase in productivity of oats affected by weather conditions. The efficiency of nitrogen use by oats in association with climatic conditions is fundamental to the development of more sustainable managements with yield and quality. The objectives of this study were to define the agronomic efficiency of nitrogen by the ratio of the dose provided and product obtained, estimate the maximum technical efficiency of the nutrient on grain yield; and for the optimum dose, simulate the expression of the straw and industry yields, protein and total fiber in different conditions of the agricultural year in a soybean/oat system. The study was conducted from 2011 to 2016, in Augusto Pestana, RS, Brazil, in a randomized block design with four repetitions in a 4 * 2 factorial referring to nitrogen doses (0, 30, 60 and 120 kg [ha.sup.-1]) and oat cultivars (Barbarasul and Brisasul) in a soybean/oat system. Nitrogen increased grain, straw, and industry yields and total grain protein, with agronomic efficiency of 7.8, 19.7 and 3.3 kg [ha.sup.-1] and 0.10 g [kg.sup.-1], respectively, with reduction of the total fiber in 0.05 g [kg.sup.-1] per kg of N supplied. The dose of maximum technical efficiency in the expression of grain yield is dependent on the weather conditions during cultivation. In general, the maximum efficiency of grain productivity was obtained with 86 kg [ha.sup.-1] of N, with linear equations showing increased productivity of straw and industry yield, total protein, and reduction of the fiber content of oat grains by nitrogen use. Key words: Avena sativa L., meteorological elements, sustainable agriculture A eficiencia do nitrogenio na aveia associada as condicoes climaticas sao fundamentais no desenvolvimento de manejos sustentaveis com produtividade e qualidade. Objetivou-se neste estudo definir a eficiencia agronomica do nitrogenio pela relacao dose fornecida e produto obtido, estimar a maxima eficiencia tecnica do nutriente na produtividade de graos, e pela dose ideal, simular a expressao da produtividade de palha e de industria, proteina e libra total em diferentes condicoes do ano agricola no sistema soja/aveia. O estudo foi conduzido de 2011 a 2016, em Augusto Pestana, RS, em delineamento de blocos casualizados com quatro repeticoes em esquema fatorial 4*2 referente a doses de nitrogenio (0, 30, 60 e 120 kg [ha.sup.-1]) e cultivares de aveia (Barbarasul e Brisasul) no sistema soja/aveia. O nitrogenio incrementa a produtividade de graos, de palha, de industria e o teor de proteina dos graos, com eficiencia agronomica de 7,8, 19,7 e 3,3 kg [ha.sup.-1] e 0,10 g [kg.sup.-1], respectivamente, com reducao na fibra total de graos de 0,05 g [kg.sup.-1] por kg de N fornecido. A dose de maxima eficiencia tecnica na expressao da produtividade de graos depende das condicoes de cultivo. Em geral, a maxima eficiencia de produtividade de graos e obtida com 86 kg [ha.sup.-1] de N, com equacoes lineares que mostram acrescimos da produtividade da palha e de industria e a proteina total, e reducao do teor de fibras dos graos de aveia pelo uso do nitrogenio. Palavras-chave: Avena sativa L., elementos meteorologicos, agricutura sustentavel

Source Citation

Source Citation   

Gale Document Number: GALE|A662090027