Olivo, Clair Jorge and Aguirre, Priscila Flôres (2013) Produtividade e proteína bruta de pastagens de capim elefante manejadas sob os sistemas agroecológico e convencional. [Productivity and crude protein of elephant grass pastures managed under agroecological and conventional systems.] Ciência Rural, 43 (8), pp. 1471-1477.
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Summary
O objetivo desta pesquisa foi avaliar a massa, o teor de proteína bruta da forragem e a taxa de lotação em pastagens de capim elefante em dois sistemas de produção. No sistema convencional, o capim elefante foi plantado em linhas afastadas a cada 1,2m. No sistema agroecológico, o capim foi plantado em linhas afastadas a cada 3m; no espaço entre as linhas, no período hibernal, foram semeados o azevém anual e o trevo vermelho e, no período estival, permitiu-se o desenvolvimento de espécies de crescimento espontâneo. Foram utilizados 150kg de N ha-1 com fertilizantes químico e orgânico para os respectivos sistemas forrageiros. Foram usadas vacas em lactação que receberam complementação à razão de 0,9% do peso vivo. Para determinação do teor de proteína bruta, foram retiradas amostras simulando o pastejo. Valores similares foram observados quanto à composição estrutural do capim elefante em ambos os sistemas. Durante o período experimental, foram conduzidos oito e sete pastejos para os respectivos sistemas. Os valores médios de massa de forragem de pré-pastejo e da taxa de lotação foram de 3,7 e 4,8t ha-1 e de 2,10 e 2,51UA ha-1 dia-1. A pastagem sob sistema agroecológico apresenta melhor distribuição de forragem ao longo do ano. Teores elevados de proteína bruta foram observados no período hibernal, em ambos os sistemas forrageiros.
Summary translation
The objective of this research was to evaluate the forage mass, crude protein and stocking rate on elephantgrass pastures in two production systems. In the conventional system elephantgrass was planted in rows 1,2m apart from each other. In the agroecological system elephant grass was planted in rows 3m apart from each other. In the space between alleys, in cool season, annual ryegrass and red clover were introduced; allowing the development of spontaneous growing species in the warm season. It was applied 150kg of N ha-1 with chemical and organic fertilizers in the respective pastures. Holstein cows receiving 0.9% of body weight complementary concentrate feed were used. Hand-plucked samples were collected to analyze crude protein. Similar value was found in the structural components of elephantgrass pastures in both pasture systems. Eight and seven grazing cycles were performed during the experimental period for respective systems. The average dry matter value for pre-grazing and stocking rate were 3.7 e 4.8t ha-1 and 2.10 e 2.51AU ha-1 day-1 for each respective systems. Agroecological system presents best forage distribution throughout the year. Higher values of crude protein of elephantgrass were observed in cool season in both systems.
| EPrint Type: | Journal paper |
|---|---|
| Keywords: | Vacas leiteiras, Lolium multiflorum, Pennisetum purpureum, Sistemas de produção, Trifolium pratense. Lactating cows, Lolium multiflorum, Pennisetum purpureum, Production systems, Trifolium pratense. |
| Agrovoc keywords: | Language Value URI English agroecology http://aims.fao.org/aos/agrovoc/c_92381 English Cows http://aims.fao.org/aos/agrovoc/c_1939 English Lolium multiflorum http://aims.fao.org/aos/agrovoc/c_4424 English Pennisetum purpureum http://aims.fao.org/aos/agrovoc/c_5677 English Trifolium pratense http://aims.fao.org/aos/agrovoc/c_7917 English forage http://aims.fao.org/aos/agrovoc/c_36108 English Organic fertilizers http://aims.fao.org/aos/agrovoc/c_4592 |
| Subjects: | Crop husbandry > Production systems > Pasture and forage crops Crop husbandry > Production systems Farming Systems Farming Systems > Farm nutrient management |
| Research affiliation: | Brazil > Other organizations |
| ISSN: | 0103-8478 |
| DOI: | 10.1590/S0103-84782013000800021 |
| Related Links: | http://www.scielo.br/?lng=pt |
| Deposited By: | Sartor, Luana Alessandra |
| ID Code: | 28550 |
| Deposited On: | 19 May 2015 19:43 |
| Last Modified: | 19 May 2015 19:43 |
| Document Language: | Portuguese/Portugues |
| Status: | Published |
| Refereed: | Peer-reviewed and accepted |
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