Nitrogênio e época de colheita nos componentes da produtividade de forragem e sementes de capim-mombaça

Neto, Armindo Barth; Boleta, Vinícius Scandolara; Júnior, Edson José Pancera; Almeida, Gisele Luziane de; Canto, Marcos Weber do; Gasparino, Eliane; Baltazar, Leonardo Fiorio

doi:10.1590/s0100-204x2010001100012

Pesq. agropec. bras.

2010

DOI: 10.1590/s0100-204x2010001100012

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Nitrogênio e época de colheita nos componentes da produtividade de forragem e sementes de capim-mombaça

Armindo Barth Neto

Vinícius Scandolara Boleta

Edson José Pancera Júnior

et al.

Abstract: Resumo -O objetivo deste trabalho foi avaliar o efeito de doses de nitrogênio e de épocas de colheita de sementes sobre componentes de produtividade de forragem e sementes de capim-mombaça (Panicum maximum cultivar Mombaça). Os tratamentos foram constituídos das doses 0, 75, 150, 225 e 300 kg ha -1 de N e da colheita das sementes aos 8 e 14 dias após a antese. Utilizou-se o delineamento em blocos ao acaso em parcelas subdivididas, com quatro repetições. A produtividade de forragem e de lâmina foliar foi afetad… Show more

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Cited by 3 publications

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Production and Tillering of Mombaça Grass With Different Sources and Levels of Applied Nitrogen

Rosado¹,

Gontijo²,

Almeida³

et al. 2016

Reveng

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Nitrogen influences numerous physiological and morphological traits of forage grasses, which ultimately interfere directly with production and forage quality. Aimed to study was to evaluate the production of dry matter and the number of tillers of Panicum maximum cv. Mombaça grown with different sources and levels of applied nitrogen. The experiment was conducted at the Federal Institute of the Espírito Santo, Campus of Santa Teresa. The experimental design consisted of a randomised block design with three replicates in a 3 x 6 factorial design and three nitrogenous fertilizers (urea, ammonium sulphate and calcium nitrate), which were applied at six different levels (0, 120, 240, 360, 480 and 600 kg ha-1) during the experimental period, for a total of 54 experimental units. Nitrogen levels were divided into seven applications, and the treatments were applied every 28 days, always after the forage was cut. The results show that Mombaça grass is responsive to nitrogen fertilization, and the response in terms of dry matter production and number of tillers for the same level of nitrogen varies depending on the nitrogen source used. Of the nitrogen sources, calcium nitrate had the best performance for the variables evaluated here. For this nitrogen source, the production of dry matter achieved at the maximum level of nitrogen was 18% and 36% higher than the dry matter achieved with the use of ammonium sulphate and urea, respectively.

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Production and Tillering of Mombaça Grass With Different Sources and Levels of Applied Nitrogen

Rosado¹,

Gontijo²,

Almeida³

et al. 2016

Reveng

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Produção e qualidade de sementes do capim-mombaça em função da adubação nitrogenada

et al. 2012

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ResumoO objetivo deste experimento foi avaliar os componentes da produção de sementes, a produtividade de sementes aparentes e puras e a qualidade de sementes do capim-mombaça (Panicum maximum Jacq. cv. Mombaça), adubado com quatro doses de nitrogênio (0, 50, 100 e 150 kg ha -1 ). O delineamento experimental foi em blocos ao acaso, com quatro repetições. As variáveis analisadas foram os números de perfilhos vegetativos e com panículas, números de sementes por panícula e por área, índice de colheita, massa de mil sementes puras e a germinação de sementes. Houve efeito linear da dose de nitrogênio sobre o número de perfilhos com panículas, nos números de sementes aparentes e puras por panícula e por área, nas produtividades de sementes aparentes, puras e puras viáveis e sobre o índice de colheita. Na maior dose de N aplicada, a produtividade de sementes aparentes foi de 73 kg ha -1 e de sementes puras igual a 34 kg ha -1. Correlações significativas foram obtidas entre produtividade de sementes aparentes e puras, com a massa de perfilho com panícula, número de perfilhos com panícula, número de sementes aparentes e puras, por panícula e por área, com a matéria seca ha -1 e com o índice de colheita. A massa de mil sementes puras e a germinação de sementes não foi influenciada pela adubação nitrogenada.Palavras-chave: índice de colheita, Panicum maximum, produção de sementes de gramínea tropical, qualidade de sementes da cultivar Mombaça. Seed yield and quality of Mombaça grass submitted to nitrogen levels AbstractThe objective of this experiment was to evaluate the influence of nitrogen doses on seed production and quality of the Mombaça grass (Panicum maximum Jacq. cv. Mombaça). The nitrogen doses were 0, 50, 100 and 150 kg ha -1 , in a completely randomized block design with four replications. The variables evaluated were the number of vegetative and fertile tillers, the number of apparent and pure seeds per panicle and area, the harvesting index, the weight of one thousand pure seeds, and the percentage of seed germination. Linear effects were observed with the nitrogen doses on the number of fertile tillers, number of apparent and pure seeds per panicle and area, harvest index, apparent and pure seed yields, and the viability of the pure seeds. At the highest dose of N applied, the apparent seed yield was 72.6 kg ha -1 and pure seed yield was 34.3 kg ha -1 . Apparent and pure seed yields were highly correlated to the number of fertile tillers and their individual mass, number of apparent and pure seeds per panicle and area, dry matter ha -1 and harvest index. The nitrogen fertilization had no influence on the weight of one thousand pure seeds and percentage of seed germination.

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Seed production of 'Mombasa' grass subjected to different closing cut dates and nitrogen rates

Canto

Almeida

Costa

et al. 2016

Pesq. agropec. bras.

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-The objective of this work was to evaluate the effects of closing cut dates (CCD) and nitrogen (N) rates on the components of pure seed yield (PSY) and seed quality in 'Mombasa' grass (Megathyrsus maximus 'Mombaça'), besides determining the parameters of apparent N efficiency (ANE) and agronomic N efficiency (AgNE). The field experiments were carried out over two growing seasons, 2010/2011 and 2011/2012, in Umuarama, PR, Brazil. The folllowing treatments were evaluated: CCD on October 10, January 31, February 15, and March 1; and N doses at 0, 75, 150, and 225 kg ha -1 . Significant interactions between the CCD and N doses were observed for the panicle tiller number (PTN), pure seeds per panicle, PSY, ANE and AgNE. Values of ANE and AgNE were better for 150 kg N ha -1 . There were no effects of CCD and N doses on seed quality. PSY was closely correlated with PTN, pure seeds per panicle, and pure seed number.The CCD treatments of longer growth duration and higher N doses showed the higher PSY. Final CCD delaying until February and N availability reduced yield. Closing cut date and N fertilization affect pure seed yield and yield component responses of 'Mombasa' grass.Index terms: agronomic nitrogen efficiency, apparent nitrogen efficiency, seed quality, seed yield. de N. A DR e o N não tiveram efeitos sobre a qualidade das sementes. O RSP foi estreitamente correlacionado ao NPP, às sementes puras por panícula e ao número de sementes puras. As DRs com maiores durações de crescimento e doses de N tiveram maiores RSP. O atraso da DR final até fevereiro e a disponibilidade de N reduziram os rendimentos. A data de rebaixamento e a adubação com N afetam as respostas do rendimento de sementes puras e as componentes do rendimento do capim-mombaça. Produção de sementes de capim-mombaça submetido a diferentes datas de rebaixamento e doses de nitrogênioTermos para indexação: eficiência agronômica de nitrogênio, eficiência aparente de nitrogênio, qualidade de sementes, rendimento de sementes.

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Nitrogênio e época de colheita nos componentes da produtividade de forragem e sementes de capim-mombaça

Cited by 3 publications

References 9 publications

Production and Tillering of Mombaça Grass With Different Sources and Levels of Applied Nitrogen

Production and Tillering of Mombaça Grass With Different Sources and Levels of Applied Nitrogen

Produção e qualidade de sementes do capim-mombaça em função da adubação nitrogenada

Seed production of 'Mombasa' grass subjected to different closing cut dates and nitrogen rates

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