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Nucleus  2011 

PRODU O DE FITOMASSA SECA DE OITO ESPéCIES VEGETAIS EM DUAS éPOCAS DE SEMEADURA NA REGI O NOROESTE DO ESTADO DE S O PAULO

Keywords: Forage. Cover crops. Millet. Sorghum. Sunn hemp. - Forragem. Plantas de cobertura. Milheto. Sorgo. Crotalária.

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Abstract:

This work was done in Fernandópolis/SP, with the purpose of evaluate production potentialand bromatologic composition of dry phytomass produced by eight vegetable species in two sowing seasons forsoil covering and/or animal feeding. The studied species were: millet, forage sorghum, finger-millet, gray andblack mucuna, sunn hemp, lablab and forage turnip. The assay was installed in two steps, May 12, 2002 (draughtseason) and December 3, 2002 (rain season). All the phabaceae, besides forage sorghum and millet, producedabout twice more phytomass per area during the rain season compared to the draught season. The millet wassuperior to the other species during the rain season, reaching 16.7 t ha-1 of dry phytomass, being the sunn hempthe phabaceae with the biggest production (12.1 t ha-1). The forage turnip isn't indicated for the dry phytomassproduction for soil covering in the seasons studied. During rain season all others respond to the minimumnecessary production of dry phytomass for soil covering and during the draught season, just the millet does it.Aiming animal feeding, all the species studied can be used, with restrictions to sunn hemp, which may have toxicsubstances, independent of sowing season. The millet is the favorite culture once it presents adequate dryphytomass production in both evaluated seasons, associated to nutritional quality of the produced forage crop,besides possibility of re-sprouting after the cut or grazing.Este trabalho foi realizado no município de Fernandópolis/SP com o objetivo de avaliar opotencial de produ o e a composi o bromatológica da fitomassa seca de oito espécies vegetais e em duasépocas de semeadura para cobertura de solo e/ou alimenta o animal. As espécies estudadas foram: milheto,sorgo forrageiro, capim pé-de-galinha, mucuna cinza e preta, crotalária, lablabe e nabo forrageiro. O ensaio foiinstalado em duas etapas, 12/05/2002 (época da seca) e 03/12/2002 (época das águas). Todas as fabáceas, alémdo milheto e do sorgo-forrageiro, produziram cerca de duas vezes mais fitomassa por área na época das águas emrela o à da seca. O milheto foi superior às demais espécies nas águas, atingindo 16,7 t ha-1 de fitomassa seca,sendo a crotalária, a fabácea com maior produ o (12,1 t ha-1). Concluiu-se que o nabo forrageiro n o é indicadopara a produ o de fitomassa seca para cobertura do solo nas duas épocas estudadas, sendo que, nas águas, todasas demais atendem à produ o mínima de fitomassa necessária para uma adequada cobertura do solo, e na seca,apenas o milheto. Visando à alimenta o animal, todas as espécies estudada

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