Densidades de plantas e doses de nitrogênio no desempenho de híbridos de milho safrinha em Dois Vizinhos - PR
Corn grown as a second summer crop for grain is something new in the southwest of Paraná. The cultivation of early soybean varieties and the availability of new corn hybrids associated with its high demand have allowed it cultivation in offseason. In this context, it is important to study the behavi...
| Autor principal: | Giaretta, Roniel |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/10715 |
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| Resumo: |
Corn grown as a second summer crop for grain is something new in the southwest of Paraná. The cultivation of early soybean varieties and the availability of new corn hybrids associated with its high demand have allowed it cultivation in offseason. In this context, it is important to study the behavior of these corn hybrids and their response to planting densities and nitrogen levels in order to optimize the yield in new producing areas. The study aimed to evaluate the performance of agronomic traits and yield of two hybrids: 2B587 and AG9030 undergoing populations of 45, 55, 65, 75 thousand plants ha-1 with applications of 0, 50, 100, 150 kg ha-1 of nitrogen. Experiment was carried on in 2015 at Dois Vizinhos - PR in a randomized block design with three replications in a factorial 2 x 4 x 4 (hybrid x nitrogen x plant density). Were evaluated the structural components of plants and yield components. Final plant height, ear insertion height, stem diameter, plants with more than one ear, number of ears per area, number of rows per ear, number of grains per ear and productivity total increased as nitrogen rates increased. Regarding plant density, stalk diameter, plant with more than ear, prolificacy, number of kernels per row, number of grains per ear and thousand grain weight was affected by increased density, however, the height final plant, height insertion ear, plants without ears, number of ears per area, percentage of small ears and yield increased as plant density increased. |
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