Effect of Artificial Detasseling and Defoliation on Maize Seed Production
Marcio Paulo Czepak
Departament of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
Marcio Kliemann
Agricultural Science Center, State University of Western Parana, Marechal Cândido Rondon, PR, Brazil.
Omar Schmildt
Postgraduate Program in Tropical Agriculture, Federal University of Espírito Santo, São Mateus, ES, Brazil.
Rubens Neres Araujo
Departament of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
Vinicius de Souza Oliveira *
Postgraduate Program in Tropical Agriculture, Federal University of Espírito Santo, São Mateus, ES, Brazil.
Lucas Moreira Borges Junior
Departament of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
Ana Gabriela Berger Zanala
Departament of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
Ana Gabriela Berger Zanala
Departament of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
Karina Tiemi Hassuda dos Santos
Departament of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
Jéssica Sayuri Hassuda Santos
Departament of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
Gleyce Pereira Santos
Departament of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
Edilson Romais Schmildt
Departament of Agrarian and Biological Sciences, Federal University of Espírito Santo, São Mateus, ES, Brazil.
*Author to whom correspondence should be addressed.
Abstract
The objective of this work was to evaluate the effect of artificial detasseling and defoliation on the production of Pioneer 30F90 simple hybrid corn (Zea mays L.) seeds. The experiment was set up in a randomized complete block design, consisting of seven treatments (Control; detasseling; detasseling + defoliation of the top leaf; detasseling + defoliation of the two upper leaves; detasseling + defoliation of the three upper leaves; detasseling + defoliation of the upper four leaves; detasseling + defoliation of the upper five leaves), with 4 replicates. The plots were composed of 6 spaced rows of 0.90 cm by 6.00 m in length. At the time of the issue of 50% of the tassel were carried out the treatments. For the evaluations the two central lines of each plot were collected, eliminating 1.00 m from each end, totaling a useful area of 7.2 m². At harvest, the crop presented a final stand of 5 plants m² (50000 ha-1). According to the results obtained, it was concluded that the detasseling positively influenced the production components, due to the decrease of the auto-shading. The higher the level of defoliation, the lower the active photosynthetic area of the plant, and consequently the lower the productivity. The most affected production components in defoliation are grain numbers in the row, grain numbers in the ear and weight of 1000 grains. detasseling and defoliation do not interfere with the germination of corn seeds.
Keywords: Zea mays L., light interception, tassel, grain yield.