Resposta da produtividade de grãos e outras características agronômicas do trigo EMBRAPA-22 irrigado ao nitrogênio em cobertura

Coelho, Mariane; Souza, Moacil Alves de; Ribeiro, Ailton; Sediyama, Carlos Sigueyuki

doi:10.1590/s0100-06831998000300022

Cited by 22 publications

(20 citation statements)

References 14 publications

(12 reference statements)

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“…Results were different from those found by Coelho et al (1998), where the weight of hectoliter, in two years of evaluation of wheat irrigated with application of N in cover, reduced linearly with the increment of the doses. Experiments conducted by Oliveira et al (2013) point out that they did not obtain differences with different N dosages, and these dosages ranged from 0 to 120 Kg ha-1 of N and the PH remained at 79.…”

Section: Resultscontrasting

confidence: 99%

Doses and Stages of Application of Nitrogen In The Wheat Culture

2017

Aust. J. Basic & Appl. Sci.

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Triticunaestivun is considered a high yield crop, climate factors, handling and nutrition can compromise its yield. Regarding the nutrition of T. aestivun, nitrogen is a limiting factor in production, being one of the most absorbed and required elements. Nitrogen deficiency interferes with the growth and development of the plant, because this element is fundamental in the formation of compounds, like all proteins and nucleic acids. The objective of this research was to evaluate the wheat production components with the application of nitrogen in different doses and times and thus to indicate the appropriate management for the application of this nutrient in the crop under the edaphoclimatic conditions of the Southwest region of Paraná. The experiment was carried out in a randomized block design, with plots subdivided into five replicates. The treatments were composed of four nitrogen doses (0, 50, 100, 200 kg ha -1 ) and three application stages (tillering, booting and grouting). The variables evaluated were the severity of the disease (%), plant height (cm), fresh plant mass (kg ha -1 ), plant dry mass (kg ha -1 ), number of growing spikes (m 2 ), yield (ha -1 ), number of spikelets per ear, weight of grain and weight of hectoliters. The results were submitted to analysis of variance using the Assistat statistical program for later comparison of the means by regression analysis. There was interaction between treatments for fresh and dry mass varied. The number of cultivars, plant height (cm), spikelets per spike, peaks per m2 and yield (ha -1 ) were significant for the doses. As to the severity of the diseases and the weight of the hectoliters, they did not present any significance. The highest productivity was obtained with the application of 110.4 kg ha -1 in the cropping of the crop. However, the need to develop further studies to suit the most ideal phenological stage for nitrogen application as well as the dose.

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Section: Resultscontrasting

confidence: 99%

Doses and Stages of Application of Nitrogen In The Wheat Culture

2017

Aust. J. Basic & Appl. Sci.

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“…The maximum harvest index, estimated at 86.20kg ha -1 N, was 0.4921 ( Figure 3A). The quadratic response was similar to that reported for the wheat cultivar 'EMBRAPA-22' in two years of cultivation (COELHO et al, 1998). This is because nitrogen applications promote increases in plant growth and reductions in harvest index, since increases in grain yield are proportionately smaller than the increase in vegetative growth (KOLCHINSKI & SCHUCH, 2002).…”

Section: Resultssupporting

confidence: 78%

“…The rise in N supply stimulates vegetative growth (BUZETTI et al, 2006), reduces tissue hardness and, among other agronomic effects, contributes to increase in grain yield (COELHO et al, 1998;TEIXEIRA FILHO et al, 2007). These combined factors contribute to plant lodging, which is caused by low stem resistance, greater mass of mature ears and winds.…”

Section: Resultsmentioning

confidence: 99%

Rates of nitrogen and growth retardant trinexapac-ethyl on wheat

et al. 2011

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The objective in this study was to evaluate the effects of nitrogen rates in association with rates of the growth retardant trinexapac-ethyl on wheat. The experiment was conducted in Viçosa, MG and arranged in a 5×4 factorial, randomized block design, with four repetitions. A combination of five nitrogen rates (30, 60, 90, 120 and 150kg ha -1 ) with four rates of trinexapac-ethyl (0, 62.5, 125 and 187.5g ha -1

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“…Fageria et al (2007) afirmam que o peso de 100 sementes é um componente da produtividade bastante estável e característico da cultivar, podendo portanto ser utilizado na seleção indireta para o aumento da produtividade, já que este sofre menor interferência do fator ambiente. Coelho et al (1998) atribuíram ao aumento nos valores da massa de cem grãos com o aumento no número de grãos por espiga, diminuindo a competição por nutrientes e fotoassimilados dentro da espiga e, como consequência, aumentando a massa dos grãos. Carvalho e Nakagawa (2000) , respectivamente, sendo o baixo N 23% menos produtivo em relação a alto N. Souza (2007) avaliando famílias de meios-irmãos de milho observou 32% de aumento de produtividade no ambiente de alto N. No ambiente de alto N, 18 populações apresentamse no grupo de produtividades superiores, sendo que a população mais produtiva foi a 12-6, com 6.956 kg ha -1 e a população 11-3 a menos produtiva neste grupo, com média de 5.500 kg ha -1…”

Section: Resultados E Discussõesunclassified

Eficiência no uso de nitrogênio e correlação fenotípica em populações tropicais de milho no Tocantins

Cancellier¹,

Afférri²,

Carvalho³

et al. 2011

Rev. Ciênc. Agron.

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Resumo -O objetivo deste trabalho foi avaliar a eficiência no uso do nitrogênio e a correlação fenotípica de 24 populações de milho no Sul do Tocantins. Foram realizados dois experimentos, cada um correspondendo a um nível de adubação nitrogenada (alta e baixa) plantados no dia 21/11/2009. Os tratamentos foram constituídos de 24 populações obtidas do Programa de Melhoramento de Milho da Universidade Federal do Tocantins e uma variedade comercial, BR 106, usada como testemunha. O delineamento experimental utilizado, nos dois experimentos, foi blocos casualisados com duas repetições, sendo avaliado o peso de 100 sementes, peso hectolítrico, produtividade, e os índices de eficiência de uso do nitrogênio segundo metodologia proposta por Fischer et al. (1983) e Moll et al. (1982. Os genótipos 12-6; 25-5; 35-5; 12-2; 12-3 e 1-5 formaram o grupo das populações de maiores produtividades independente da condição de N no solo, com médias variando de 6.348 a 5.774 kg ha -1 . Pela metodologia de Moll foi possível diferenciar populações quanto à eficiência no uso de nitrogênio, no ambiente de baixa disponibilidade de N no solo. As características estudadas foram influenciadas pelos diferentes níveis de nitrogênio aplicados, exceto para a característica de peso de 100 sementes. As populações avaliadas apresentaram diferenças entre si, em todas as características estudadas, indicando variabilidade. O índice de Moll apresentou associação significativa com todas as características, exceto para o índice de Fischer, indicando ser possível a obtenção de genótipos eficientes no uso de nitrogênio por meio de seleção destas características. Palavras-chave -Milho. Melhoramento genético. Plantas-efeito do nitrogênio.Abstract -The objective of this study was to evaluate the nitrogen efficiency use and phenotypic correlation of 24 maize populations in Tocantins. Two experiments were conducted, each corresponding to a level of fertilization (high and low N) planted on 21/11/2009, treatments consisted of 24 populations obtained from the Maize Breeding Program of Federal University of Tocantins and a commercial variety, BR 106, used as control. The experimental design in both experiments was randomized blocks with two replicates, and evaluated 100 seeds weight, hectoliter weight, yield and nitrogen use efficiency according to the methodology by Fischer et al. (1983) and Moll et al. (1982). The genotypes 12-6; 25-5; 35-5; 12-2; 12-3 and 1-5 formed the group of genotypes of higher yields, independent of soil N, with averages ranging from 6,348 to 5,774 kg ha -1. By the methodology of Moll was possible to differentiate populations for nitrogen use efficiency in environment of low availability of soil N. The characteristics evaluated were influenced by different levels of nitrogen, except for 100 seeds weight. The populations studied differ itself in all characteristics, indicating variability. Moll index was significantly associated with all characteristics studied except for the Fischer index, indicating possible to obtain genotypes efficient...

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Resposta da produtividade de grãos e outras características agronômicas do trigo EMBRAPA-22 irrigado ao nitrogênio em cobertura

Abstract: RESUMO

Cited by 22 publications

References 14 publications

Doses and Stages of Application of Nitrogen In The Wheat Culture

Doses and Stages of Application of Nitrogen In The Wheat Culture

Rates of nitrogen and growth retardant trinexapac-ethyl on wheat

Eficiência no uso de nitrogênio e correlação fenotípica em populações tropicais de milho no Tocantins

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