Agronomic optimal plant density for corn in subtropical environments

Autor: Eduardo Daniel Friedrich, Bruna San Martin Rolim Ribeiro, Victória Brittes Inklman, Isabela Bulegon Pilecco, Nereu Augusto Streck, Mateus Possebon Bortoluzzi, Astor Henrique Nied, Alencar Junior Zanon
Jazyk: English<br />Spanish; Castilian<br />Portuguese
Rok vydání: 2022
Předmět:
Zdroj: Pesquisa Agropecuária Brasileira, Vol 57 (2022)
Druh dokumentu: article
ISSN: 1678-3921
DOI: 10.1590/s1678-3921.pab2022.v57.02963
Popis: Abstract The objective of this work was to determine the agronomic optimal plant density (AOPD) for corn (Zea mays) in environments with a high, medium, and low grain yield, as well as to define which yield component is the most sensitive to variations in plant density. On-farm experiments were conducted in the municipalities of Júlio de Castilhos, in the 2018/2019 growing season, and of Entre-Ijuís, Jóia, Agudo, and Júlio de Castilhos, in the 2019/2020 growing season, in the state of Rio Grande do Sul, Brazil. The production environments were classified as having a low (< 10 Mg ha-1), medium (from 10 to 16 Mg ha-1), and high (> 16 Mg ha-1) grain yield. Júlio de Castilhos was identified as a site of high yield; Jóia and Entre-Ijuís, as of medium yield; and Agudo, as of low yield. The AOPDs ranged from 60,000 to 140,000 plants per hectare in the different production environments. The AOPD was of 110,300 to 116,200 plants per hectare for the high-yield environment, 101,000 plants per hectare for the medium-yield environment, and 60,000 plants per hectare for the low-yield environment. The number of grains per row is the yield component that is the most sensitive to variations in plant density in all production environments.
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