desempenho de pastagem nativa e pastagem sobre-semeada com forrageiras hibernais com e sem glifosato performance of native pasture and pasture sodseeded with winter species with or without glyphosate

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ID: 146002
2004
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Abstract
O experimento foi desenvolvido em Bagé-RS, visando avaliar a produção de matéria seca (MS), taxa de lotação (kg de PV ha-1), ganho de peso vivo por animal (GMD, kg an-1 dia-1) e ganho por hectare (GPV ha-1) em: T1-pastagem nativa (testemunha); T2-pastagem nativa sobre-semeada com azevém (Lolium multiflorum), trevo branco (Trifolium repens) e cornichão (Lotus corniculatus); T3- semelhante ao anterior, mais aplicação de glifosato; T4- semelhante ao anterior, porém com adubação dobrada. Foram utilizados novilhos Braford. O sistema de pastejo foi o contínuo com ajustes na lotação para manter um nível de oferta de forragem de 10% (10kg de MS 100kg PV-1 dia-1). Para a determinação da MS da pastagem, utilizou-se o método da dupla amostragem com uso de disco e para a determinação da taxa de acúmulo de MS, utilizou-se o método da gaiola de exclusão. As análises estatísticas foram feitas no programa SAS (1997). O delineamento experimental foi blocos inteiramente casualizados, tendo dois blocos e quatro tratamentos. A introdução de espécies hibernais em pastagem nativa com ou sem uso de glifosato contribuiu para aumentar a produtividade do campo nativo. A sobre-semeadura de espécies hibernais permitiu maior carga e ganho por animal e por área comparados com a pastagem nativa.
The experiment was developed in Bagé-RS, Brazil, to evaluate the dry matter production (DM), stocking rate (kg LW ha-1), live weight gain per animal (ADG, kg head-1 day-1) and gain per area (GPA, kg LW ha-1) in: T1-native pasture (control); T2-native pasture sodseeded with Italian ryegrass (Lolium multiflorum), white clover (Trifolium repens) and birdsfoot trefoil (Lotus corniculatus); T3-similar to anterior, plus glyphosate spraying; T4-similar to anterior, but with double fertilization. It were utilized Braford steers. The grazing method was the continuous stocking, with stocking adjustments to maintain a level of forage on offer of 10% (10kg of DM 100kg LW-1 day-1). To determine the DM of pasture, it was utilized the double sample method with a disc meter and the cage method for the pasture accumulation rate. The experimental design was a complete randomized blocks, with two blocks and four treatments. The introduction of cool season species in native pasture, with or without glyphosate spraying, contributes to increase native pasture productivity. Over-seeding cool season species allowed a higher stocking rate and animal production per animal and per area as compared to natural pasture.
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Authors Luciana Melo Rizo, Eduardo Londero Moojen, Fernando Luiz Ferreira de Quadros, Francisco Leal Côrrea, José Acélio Fontoura Júnior
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Journal Trials
Year 2004
DOI
10.1590/S0103-84782004000600039
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000600039
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