Nitrogen use efficiency and recovery in a wheat-corn rotation under tropical savannah conditions

Autor: Marcelo Carvalho Minhoto Teixeira Filho, Castro Alves da Silva Júnior, Fernando Shintate Galindo, Paulo H. Pagliari, Eduardo Bianchi Baratella, Antônio Leonardo Campos Biagini, Willian Lima Rodrigues, Takashi Muraoka, Edson Cabral da Silva, Mário João Moretti Neto, Guilherme Carlos Fernandes
Přispěvatelé: Universidade Estadual Paulista (Unesp), Goiano Federal Institute, University of Minnesota, Universidade de São Paulo (USP)
Rok vydání: 2021
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
ISSN: 1573-0867
1385-1314
DOI: 10.1007/s10705-020-10115-4
Popis: Made available in DSpace on 2021-06-25T10:21:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-04-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Stable isotopes (e.g., 15N) can be used to develop best practices for fertilizer management in cereal crops under tropical conditions. The objectives of this study were to determine the N contribution from fertilizer and soil to wheat and corn grown in rotation and the residual N contribution from fertilizer applied to wheat and carried over to corn under Brazilian savannah conditions. This study was established in a no-till system on Rhodic Haplustox soil in a randomized complete block design with four replications. The N treatments applied to the wheat crops were 0, 20, 40, 60, 80 and 160 kg (urea-15N) ha−1. The residual effects of N on the succeeding corn crop were evaluated. During the corn phase, two additional treatments were included: a control (0 N) and a treatment with 160 kg N ha−1. Regression analysis showed that the highest estimated wheat yield (5415 kg ha−1) was observed with the application of 114 kg N ha−1. Significant effects from the residual N were observed in the corn shoot biomass and straw N uptake. On average, the recovery rate of the urea N fertilizer was 34% for wheat, and the residual urea N fertilizer use in corn (when applied to wheat) was less than 5% of the amount initially applied. The effect of the residual N was not enough to meet the N demands of the succeeding corn crop. The results of this study provide producers and the scientific community with good estimates of nitrogen use efficiency for wheat and corn. Department of Plant Health Rural Engineering and Soils College of Engineering Sao Paulo State University (UNESP), Avenida Brasil, 56 - Centro Goiano Federal Institute, Rio Verde Campus Department of Soil Water and Climate Southwest Research and Outreach Center University of Minnesota Center for Nuclear Energy in Agriculture University of Sao Paulo Department of Plant Health Rural Engineering and Soils College of Engineering Sao Paulo State University (UNESP), Avenida Brasil, 56 - Centro FAPESP: 18/08485-7 CNPq: 312359/2017-9
Databáze: OpenAIRE
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