Efeito da Fonte de Nitrogênio e da Época de Aplicação na Cultura do Milho, em Plantio Direto, com Espaçamento Reduzido

Santos, Manoel Mota dos; Galvão, João Carlos Cardoso; Melo, Aurélio Vaz de; Adriano, Rodrigo Cabral; Fidélis, Rodrigo Ribeiro; Corrêa, Maria Lita Padilha

doi:10.18512/1980-6477/rbms.v10n1p29-37

Cited by 4 publications

(4 citation statements)

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“…Maize response to nitrogen fertilization depends on the amount of N available in soil, time of application and rates as well as the plant characteristics (Santos et al, 2011). There is also a distinct response of maize genotypes to nitrogen fertilization (Fagherazzi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Maize Response to Trinexapac-Ethyl and Nitrogen Fertilization

et al. 2020

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ABSTRACT: High nitrogen rates favor maize vegetative growth and grain yield losses due to stem lodging. The use of growth regulators can mitigate such effect. This work was carried out aiming to evaluate the effect of trinexapac ethyl on maize hybrids response to side-dress nitrogen rates. The experiment was carried out in Lages, Santa Catarina State, South of Brazil, during two growing seasons with two hybrids (P1680 and P30F53), and four nitrogen rates (0, 150, 300 and 450 kg N ha-1) were tested, with and without the presence of trinexapac ethyl. The experimental design was in randomized blocks arranged in split-split plots, with three replications per treatment. The plants height and ear insertion height, plant lodging and breaking, grain yield and yield components were evaluated. Grain yield increased in a quadratic way with increased nitrogen rate. The highest grain yields were 15,784 and 15,257 kg ha-1, in 2014/15 and 2015/16, respectively. Application rates higher than 150 kg of N ha-1, regardless of the use of the plant growth regulator, promoted maximum grain yield increases, ranging from 14.7 to 18.1%. The application of trinexapac-ethyl reduced the upper stem internode length, 1000-grain dry weight and did not affect the percentage of lodged plants and grain yield of both hybrids. Therefore, the use of trinexapac-ethyl did not enhance the maize grain yield response to increased rates of side-dress nitrogen.

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Section: Introductionmentioning

confidence: 99%

Maize Response to Trinexapac-Ethyl and Nitrogen Fertilization

et al. 2020

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“…Indirectly, the TGM was the characteristic that contributed most among the others to the YI of the corn genotypes in the two spacing analyzed (Figure 4), data which corroborates with Souza et al (2013) where the number of grains per plant and the TGM are those that are most directly associated with YI. Santos et al (2011) also observed estimates of the direct and indirect effects on the YI of corn genotypes. Biologically the plant patterns for both spacings are distinguished from each other.…”

Section: E45 E90mentioning

confidence: 81%

Genetic variability and effect of plant arrangement on corn

Ferreira¹,

Hunhoff²,

Amaral

et al. 2022

Agron. Sci. Biotechnol.

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One of the factors of great influence on the agronomic performance of corn plants is their population arrangement. In this respect, the objective of this work was to evaluate the effect of plant arrangement and genetic divergence in different corn genotypes. The study was conducted in the county of Mineiros-GO, Brazil. The soil is Quartzarenic Neosol (Entisol). The experimental design used was in random blocks in factorial 8x2, totaling 16 treatments corresponding to 8 corn genotypes (A8740, A8088, DKB290, DKB390, DKB177, P30F35, P30S31 and P3707) and 2 spacing between lines (0.45 m and 0.90 m), 4 repetitions. The soil preparation was done in the no-tillage system. At the end of the experiment, biometric and productivity variables were measured and analyzed using Softwares R and Genes. The analysis of variance revealed significance in the simple and main effects. Genetic divergence and the effect of plant arrangement on corn genotypes were observed, where the variables plant height, stem diameter and the thousand grain mass were the main characteristics that influenced yield. Among the analyzed genotypes, the growing of genetic material DKB390 is recommended in rows spaced at 0.45 or 0.90 m, as it has plants with ears of greater number of grains, thousand grain mass and yield, demonstrating its plasticity in adaptation to the proposed systems.

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“…A densidade ideal de semeadura associada ao melhor arranjo de plantas e ao manejo da adubação estão entre as práticas agronômicas recomendadas para a obtenção de maior produtividade de milho (STRIEDER et al, 2007;SANTOS et al, 2011). Segundo Rizzardi, Boller e Dalloglio (1994), o melhor arranjo populacional de plantas é aquele que oferece uma de avaliação da distribuição das plantas de milho no campo e a sua relação com a massa de grãos por espiga.…”

Section: Introductionunclassified

Metodologia de avaliação da distribuição das plantas de milho no campo versus massa de grãos

Klein

Klein²

2017

Pesquisa Agropecuária Pernambucana

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RESUMO:Há controvérsia se o arranjo de plantas de milho no campo realmente afeta o rendimento de grãos. Várias metodologias têm sido usadas para avaliar a eficiência das semeadoras na distribuição das sementes. Para detectar o efeito desse arranjo de plantas de forma pontual, determinaram-se os espaçamentos entre 1.115 plantas e a colheita e pesagem individual dos grãos por planta. A metodologia foi desenvolvida considerando-se os espaçamentos em ambos os lados (direito e esquerdo) das plantas e sua relação com a massa de grãos. Resultados demonstraram que a metodologia, considerando um único espaçamento, tem seus resultados afetados pelo sentido da avaliação na linha. A metodologia considerando as categorias baseadas nos espaçamentos de ambos os lados da planta mostrou-se adequada e demonstrou que apenas as plantas que apresentavam espaçamentos falhos em ambos os lados obtiveram maior massa de grãos por espiga, ocorram com baixa frequência (1,1%). A semeadora com dosador de sementes de discos alveolados proporcionou mais de 80% de espaçamentos aceitáveis. Correlacionando rendimento de grãos nas parcelas com as frequências de ocorrência das categorias de espaçamento não foi detectada significância. Conclui-se que o arranjo de plantas não afeta a massa de grãos por espiga e a estimativa de rendimento de grãos de milho. PALAVRAS-CHAVE:

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Efeito da Fonte de Nitrogênio e da Época de Aplicação na Cultura do Milho, em Plantio Direto, com Espaçamento Reduzido

Cited by 4 publications

References 0 publications

Maize Response to Trinexapac-Ethyl and Nitrogen Fertilization

Maize Response to Trinexapac-Ethyl and Nitrogen Fertilization

Genetic variability and effect of plant arrangement on corn

Metodologia de avaliação da distribuição das plantas de milho no campo versus massa de grãos

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