TILLERING DYNAMICS IN MASSAI GRASS FERTILIZED WITH NITROGEN AND GRAZED BY SHEEP

被引:0
作者
Lopes, Marcos Neves [1 ]
Duarte Candido, Magno Jose [2 ]
Fernandes Franco Pompeu, Roberto Claudio [3 ]
da Silva, Rodrigo Gregorio [4 ]
de Morais Neto, Luiz Barreto [5 ]
de Souza Carneiro, Maria Socorro [2 ]
机构
[1] Univ Fed Ceara, Dept Zootecnia, PDIZ, Fortaleza, Ceara, Brazil
[2] Univ Fed Ceara, Dept Zootecnia, Fortaleza, Ceara, Brazil
[3] Empresa Brasileira Pesquisa Agr, Ctr Nacl Pesquisa Caprinos EMBRAPA CNPC, Sobral, CE, Brazil
[4] Inst Fed Educ Ciencia & Tecnol Ceara IFCE, Limoeiro Do Norte, CE, Brazil
[5] Area Concentracao Forragicultura & Pastagens, Zootecnia, Sao Paulo, Brazil
来源
BIOSCIENCE JOURNAL | 2016年 / 32卷 / 02期
关键词
Nitrogen fertilization; Panicum maximum x P. infestum; Tillering stability index; Tiller survival rate; PERENNIAL RYEGRASS; REGROWTH; FORAGE; RESPONSES; PASTURES; BIOMASS;
D O I
暂无
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
To evaluate the tillering dynamics of massai grass under rotational sheep stocking and fertilized with nitrogen (control - 0; 400; 800 and 1200 kg ha(-1) year(-1)), this study was carried out, in a completely randomized design with repeated measures over time. The mob-grazing technique was applied to perform the grazing by employing groups of animals for rapid defoliation. The tiller appearance, survival and mortality rates, tiller biomass, and green/dead tillers ratio, have presented increase responses to nitrogen levels, with the three rates and the tiller biomass varying between evaluation periods. There was a quadratic response for the tiller flowering rate, population density of vegetative and reproductive tillers, reaching maximum values (0.051 tiller 100 tiller(-1) day(-1); 4,818 and 35 tillers m(-2), respectively) under the nitrogen levels of 613.5; 993.5 and 623.9 kg ha(-1) year(-1), respectively. For the tiller flowering rate and population density of reproductive tillers, it was verified a fluctuation between periods. The nitrogen fertilization promotes positive changes in tillering dynamics of massai grass, allowing the use of up to 800 kg ha(-1) year(-1) for maintaining the pasture stability. The tillering demography of the forage had varied little between assessment periods.
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页码:446 / 454
页数:9
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