Nitrogen rates on the agronomic performance of second-crop corn single and intercropped with ruzigrass or showy rattlebox

Authors

Abstract

Topdressing nitrogen (N) rates may alter the second-crop corn performance, and this response may vary if the corn is grown single or intercropped with grass or leguminous species. This study aimed to evaluate the effect of topdressing N rates on the growth and productive performance of second-crop corn grown single or intercropped with ruzigrass (Urochloa ruziziensis) or showy rattlebox (Crotalaria spectabilis). The experiment was carried out in a randomized block design, with a split-plot arrangement and four replications. The plots consisted of corn grown single or intercropped with ruzigrass or showy rattlebox, while the subplots consisted of N rates (0, 60, 120, 180 and 240 kg ha-1). The evaluated variables were: SPAD index at R1; normalized difference vegetation index at V4 and V7; leaf area at R1; leaf and total corn dry mass at R1; grain and total corn dry mass at R6; number of ears per plant and grains per ear; 1,000-grain mass; and grain yield. In the absence of N fertilization and with topdressing of 60 kg ha-1 of N, the intercropping with U. ruziziensis reduces the growth and productive performance of second-crop corn. The topdressing N fertilization for second-crop corn intercropped with U. ruziziensis minimizes the forage competition on corn growth and provides a productive performance similar to monocropping from 120 kg ha-1 of N. The intercropping with C. spectabilis does not change the corn growth and productive performance, as well as the response to the topdressing N rates, when compared to monocropping, in the second crop cultivation.

KEYWORDS: Zea mays L., Urochloa ruziziensis, Crotalaria spectabilis, nitrogen fertilization.

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Author Biographies

  • Moryb Jorge Lima da Costa Sapucay, Londrina State University

    Doutor, Pós-Graduação em Agronomia, Universidade Estadual de Londrina, Londrina-PR, Brasil

  • Antonio Eduardo Coelho, Santa Catarina State University

    Doutorando, Pós-Graduação em Produção Vegetal, Universidade do Estado de Santa Catarina, Lages-SC, Brasil

  • Felipe Bratti , Federal University of Paraná

    Mestrando, Programa de Pós-Graduação em Ciências do Solos, Universidade Federal do Paraná, Curitiba-PR, Brasil

  • Jorge Luiz Locatelli , University of São Paulo

    Mestrando, Programa de Pós-Graduação em Solos e Nutrição de Plantas, Universidade de São Paulo,  Piracicaba-SP, Brasil

  • Luis Sangoi , Santa Catarina State University

    Professor, Pós-Graduação em Produção Vegetal, Universidade do Estado de Santa Catarina, Lages-SC, Brasil.

  • Alvadi Antonio Balbinot Junior , Brazilian Agricultural Research Corporation

    Pesquisador, Embrapa Soja, Empresa Brasileira de Pesquisa Agropecuária, Londrina-PR, Brasil.

  • Claudemir Zucareli , Londrina State University

    Professor, Pós-Graduação em Agronomia, Universidade Estadual de Londrina, Londrina-PR, Brasil

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Published

2020-12-08

Issue

Vol. 50 (2020)

Section

Research Article

License

Authors will not be paid for published articles and must waive their copyright in favor of the PAT journal. On the other hand, they are solely responsible for the content of those articles, even if the Editor holds the right to adjust them to the norms of the journal. Authors are allowed to publish their articles simultaneously in their institutional repositories, as soon as the original publication at the PAT journal is mentioned.

How to Cite

LIMA DA COSTA SAPUCAY, M. J. et al. Nitrogen rates on the agronomic performance of second-crop corn single and intercropped with ruzigrass or showy rattlebox. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], v. 50, p. e65525, 8 Dec.2020.