Sustainable nitrogen efficiency in wheat by the dose and mode of supply

ABSTRACT The management of nitrogen by the assessment of agronomic and environmental indicators ensures satisfactory productivity with higher environmental quality. The objective of this study was to propose more sustainable management of nitrogen use in wheat, considering the supply of full and fra...

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Published in:Revista brasileira de engenharia agrícola e ambiental 2022-09, Vol.26 (9), p.670-679
Main Authors: Trautmann, Ana P. B., Silva, José A. G. da, Carvalho, Ivan R., Colet, Christiane de F., Lucchese, Osório A., Basso, Natiane C. F., Alessi, Odenis, Sgarbossa, Jaqueline, Dias, Jéssica E. L., Peter, Cibele L.
Format: Article
Language:eng ; por
Subjects:
AGRICULTURAL ENGINEERING
ENVIRONMENTAL SCIENCES
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Summary:ABSTRACT The management of nitrogen by the assessment of agronomic and environmental indicators ensures satisfactory productivity with higher environmental quality. The objective of this study was to propose more sustainable management of nitrogen use in wheat, considering the supply of full and fractioned doses with an estimate of technical, economic efficiency, and expected productivity. Two experiments were conducted, one to quantify biomass productivity and the other to evaluate grain yield. The experimental design consisted of a randomized block with four repetitions in a 5 × 3 factorial, for N-fertilizer doses (0, 30, 60, 90, and 120 kg ha-1) and nutrient supply form [full condition (100%) in the phenological stage V3 (the third leaf expanded); fractionated (70/30%) in the phenological stage V3/V6 (third and sixth leaf expanded) and; fractionated (70/30%) in the phenological stage V3/R1 (beginning of anthesis)], respectively. The most sustainable management of nitrogen in wheat was obtained with the expected yield rate of 3 t ha-1 by manual fertilization, with nitrogen supplied in full dose at the V3 phenological stage. RESUMO O manejo do nitrogênio analisando indicadores agronômicos e ambientais garante produtividade satisfatória com maior qualidade ambiental. O objetivo neste estudo é propor um manejo mais sustentável de uso do nitrogênio em trigo, considerando o fornecimento em dose cheia e fracionada com estimativa da eficiência técnica, econômica e de expectativa de produtividade. Dois experimentos foram conduzidos, um para quantificar a produtividade de biomassa e outro, para avaliação do rendimento de grãos. O delineamento experimental foi o de blocos casualizados com quatro repetições em fatorial 5 × 3, para doses de N-fertilizante (0, 30, 60, 90 e 120 kg ha-1) e forma de fornecimento do nutriente [condição cheia (100%) no estádio fenológico V3 (terceira folha expandida); fracionada (70/30%) no estádio fenológico V3/V6 (terceira e sexta folha expandida) e; fracionada (70/30%) no estádio fenológico V3/R1 (início da antese)], respectivamente. O manejo mais sustentável do nitrogênio em trigo é obtido com a dose de expectativa de produtividade de 3 t ha-1 pela adubação manual, com o nutriente fornecido em dose cheia no estádio fenológico V3.
ISSN:1415-4366
1807-1929
1807-1929
DOI:10.1590/1807-1929/agriambi.v26n9p670-679