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Management of defoliation in ecophysiology of forage production and annual ryegrass

By Ricardo Pereira da CUNHA

Abstract

No Rio Grande do Sul, a produ????o de sementes de azev??m anual (Lolium multiflorum Lam.) ?? normalmente obtida de ??reas destinadas ao pastejo e posteriormente diferidas. Compreender a ecofisiologia das plantas de azev??m anual ?? essencial para programa????o de um manejo adequado, tendo em vista uma maior produ????o de forragem e sementes. Para tanto, mediu-se os efeitos de diferentes frequ??ncias de desfolha (zero, uma, duas e tr??s) sobre as caracter??sticas morfog??nicas (taxa de aparecimento de folhas, filocrono, taxa de expans??o de folhas, taxa de senesc??ncia de folhas, taxa de expans??o dos colmos, taxa de perfilhamento e dura????o de vida da folha), produ????o de forragem e de sementes, bem como, os componentes de rendimento de sementes (n??mero de perfilhos por planta, n??mero de perfilhos f??rteis por planta, comprimento dos perfilhos, comprimento das espigas, n??mero de espiguetas por espiga, n??mero de sementes por espigueta e produ????o total de sementes) em plantas de azev??m anual da cultivar BRS Ponteio. O comportamento das plantas foi avaliado por sete meses (29/04/11 a 18/11/11). A desfolha afetou as caracter??sticas morfog??nicas, quantidade de forragem e de semente colhida de azev??m anual cultivar BRS Ponteio. A execu????o da segunda desfolha incrementou em mais de 100% a quantidade de forragem colhida em rela????o ao manejo com uma desfolha, sem reduzir o rendimento de sementes. Apesar de ter contribuido de forma importante na totalidade de forragem colhida, a terceira desfolha, afetou negativamente o filocrono, taxa de perfilhamento e dura????o de vida da folha, al??m de ter reduzido o rendimento de sementesAnnual ryegrass production of (Lolium multiflorum Lam) in Rio Grande do Sul is usually obtained from pasture areas and subsequently deferred pasture. Understanding the physiological ecology of annual ryegrass plant is essential for proper management program, with objective of getting higher forage production and seed. Therefore, the effects of different frequencies of defoliation were measured at (zero, one, two and three) on morphogenesis characteristics of annual ryegrass plants, cultivar BRS Ponteio‟. The following characteristics were evaluated (rate of leaf appearance, phyllochron, leaf expansion rate, rate of leaf senescence, rate of stem expansion, tillering rate and leaf lifespan), forage and seed, and the seed yield components (number of tillers per plant, number of fertile tillers per plant, length of tillers, length of spike, number of spikelets per spike, number of seeds per spikelet and total seed production). The plant behavior was assessed for seven months from (04/29/11 to 11/18/11). Defoliation affected the morphogenesis characteristics, amount of forage and seed harvested of ryegrass cultivar BRS Ponteio‟. The implementation of the second defoliation increased more than 100% the amount of harvested forage in relation to only one defoliation management and without reducing seed yield. The third defoliation contributed significantly to the total harvested forage, but affected negatively the phyllochron, tillering rate and leaf lifespan, and has also reduced seed yield

Topics: lolium multiflorum, poaceae forrageira, caracter??sticas morfog??nicas, rendimento, lolium multiflorum, poaceae forage, morphogenesis characteristics, yield, CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA::PRODUCAO E BENEFICIAMENTO DE SEMENTES
Publisher: Universidade Federal de Pelotas
Year: 2012
OAI identifier: oai:agregador.ibict.br.RI_UFPEL:oai:repositorio.ufpel.edu.br:123456789/1381
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