Charão, Pablo Santini ; Olivo, Clair Jorge ; Meinerz, Gilmar ; Pereira, Lilian Elgalise Techio ; Scaravelli, Luciene Fernanda de Barros ; Ziech, Magnos Fernando ; Both, José Francisco and Dullius, Ana Paula (2008) Valor nutritivo de pastagens de capim-elefante manejadas sob sistema convencional e agroecológico. [Nutritive value of elephantgrass pasture managed under conventional and agroecologic systems.] Ciência Rural, 38 (4), pp. 1092-1098.
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Summary
O capim-elefante é utilizado, na sua grande maioria, em sistemas convencionais de produção animal. O objetivo deste trabalho foi comparar o valor nutritivo do capimelefante em sistemas de manejo agroecológico e convencional, quanto a proteína bruta (PB), fibra em detergente neutro (FDN) e digestibilidade in vitro da matéria seca (DIVMS). Foram usados quatro piquetes, com 0,12ha cada um. No sistema convencional, o capim-elefante foi estabelecido singularmente. No sistema agroecológico, o plantio foi feito em linhas afastadas de 3m. Nas entrelinhas, estabeleceu-se a aveia e o azevém no período hibernal, enquanto que no período estival permitiu-se o desenvolvimento de espécies espontâneas. A adubação foi feita com fertilizantes orgânicos (150kg ha-1 de N). No sistema agroecológico, foram conduzidos sete pastejos, de 24/04/2004 a 05/05/2005. Na pastagem convencional, usouse a mesma quantidade de N (uréia), sendo conduzidos quatro ciclos de pastejo, de 06/10/2004 a 05/05/2005. Para ambos os sistemas foram utilizadas vacas da raça Holandês, recebendo complementação alimentar de 3,5kg dia-1 de concentrado com 20% de proteína bruta, constituindo-se nos animais experimentais. Nas avaliações, considerou-se a massa de forragem inicial com base na matéria seca (MS), os componentes botânicos da pastagem e estruturais do capimelefante. As análises de qualidade foram feitas em amostras de pastejo simulado. O delineamento experimental foi o inteiramente casualizado com dois tratamentos, convencional e agroecológico, duas repetições (piquetes) e em parcelas incompletas subdivididas no tempo (pastejos). Houve interação (P<0,05) entre tratamentos e pastejos em todas as variáveis. Na pastagem agroecológica, o modelo que melhor se ajustou foi o cúbico para todas as variáveis, em função do tempo de pastejo. Na pastagem convencional, a PB e a DIVMS ajustaram-se melhor ao modelo linear, com taxa positiva de crescimento, sendo observado comportamento inverso para FDN, com o decorrer dos pastejos. Tanto na pastagem convencional quanto na agroecológica encontraram-se associações negativas entre lâmina foliar do capim-elefante com PB e DIVMS e positiva com FDN. Ambos os sistemas apresentaram teores qualitativos elevados das pastagens, considerando-se a adubação, o manejo e o tempo de utilização.
Summary translation
The elephantgrass (EG) used as grazing is primarily based on the conventional systems. The objective of
this research was to evaluate the pasture quality in crude protein (CP), neutral detergent fiber (NDF) and dry matter in vitro digestibility (DMIVD), comparing distinct forage systems(agroecologic and conventional). Four paddocks, each one with 0.12ha, were used in the evaluation. In the conventional pasture, the EG was established in singular form. In agroecologic the EG plantation was in lines with a distance of 3m between lines. The mixture of oat and ryegrass in the coolseason, while spontaneous species in the warm-season have been done in the space between the lines. The fertilization was done with organic fertilizers (150kg ha-1 of N). Seven grazings were performed during the experimental period from 04/24/2004 to 05/05/2005 (375 days). Using the same amount of N(urea), four grazing cycles were performed in the conventional pasture which was evaluated for 213 days (from 10/06/2004 to 05/05/2005) on the warm-season. In both systems, Holstein cows receiving 3.5kg daily-1 complementary concentrate feed were used in the evaluation. The initial forage mass based on dry matter and pasture components was considered in the evaluation. Samples from hand-plucking method were collected to develop the qualitative analyses. The experimental design was completely randomized, with two treatments, conventional and agroecologic, two replicates (paddocks) and incomplete split plot to the time (grazings). There was interaction (P<0.05) between treatments and grazings for all parameters. At agroecologic pasture was verified cubic effect for all variables, during grazing time. In the conventional pasture, CP and DMIVD were adjusted better to the linear model, with positive growth rate, and inverse behavior were found to NDF during the grazings. In the conventional pasture as well as in agroecologic, negative associations between EG leaf lamina with CP and DMIVD and positive with NDF were found. In short, the agroecologic likewise the conventional system showed high qualitative values considering fertilization, manage and utilization time.
| EPrint Type: | Journal paper |
|---|---|
| Keywords: | Avena strigosa, Lolium multiflorum, Pastagens mistas, Pennisetum purpureum, Sistemas de produção. Avena strigosa, Lolium multiflorum, Mixed pastures, Pennisetum purpureum, Production systems. |
| Agrovoc keywords: | Language Value URI English Avena http://aims.fao.org/aos/agrovoc/c_728 English Lolium multiflorum http://aims.fao.org/aos/agrovoc/c_4424 English Mixed pastures http://aims.fao.org/aos/agrovoc/c_4876 English Pennisetum purpureum http://aims.fao.org/aos/agrovoc/c_5677 English farming systems http://aims.fao.org/aos/agrovoc/c_2807 |
| Subjects: | Crop husbandry > Production systems > Pasture and forage crops Crop husbandry |
| Research affiliation: | Brazil > Other organizations |
| ISSN: | 0103-8478 |
| DOI: | 10.1590/S0103-84782008000400029 |
| Related Links: | http://www.scielo.br/?lng=es |
| Deposited By: | Pereira, Hémilly Rose da Cruz |
| ID Code: | 21912 |
| Deposited On: | 26 Mar 2013 17:03 |
| Last Modified: | 26 Mar 2013 17:03 |
| Document Language: | Portuguese/Portugues |
| Status: | Published |
| Refereed: | Peer-reviewed and accepted |
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