Contribuição da raiz e da parte aérea de duas leguminosas de adubação verde na produção do repolho

• Autor(a) principal: Vargas, Thiago de Oliveira
• Data de Publicação: 2009
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4500
• topic: Crotalaria juncea; Canavalia ensiformis; Crescimento; Efeito residual; Crotalaria juncea; Canavalia ensiformis; Growth; Residual effect; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA

In the evaluation studies of green manure the effect of the roots are not considered. So the knowledge of the effects of parties on the production of legume crops may help to better understand the use of green manure. In this context, this work aimed to study the general effect of root and shoot of green manure Crotalaria juncea (sunnhemp) and Canavalia ensiformis (jack beans) on the nitrogen nutrition, growth and yield of cabbage. The specific objectives were to evaluate the effect of root, shoot or whole plant of green manure C. juncea and C. ensiformis on growth and production of cabbage, and evaluate the residual effect of the root, shoot or whole plant of legumes on the growth and production of cabbage. Three experiments were installed, in pots and two in the field, in a factorial way (2 x 3) + 2, being 2 species of legumes (Crotalaria juncea and Canavalia ensiformis), 3 parts of the plant (root, shoot or whole plant) and 2 additional treatments (mineral fertilizer with 100% and 50% of the recommended dose of N for the cultivation of cabbage). The second planting of cabbage was done in the same area as of the first experiment in the field, already defined in the same plots without any fertilization. In the experiment in pots, the application of the entire plant of both species of legumes reduced the production of heads of cabbage. Fertilization with N can be reduced by 50% without loss of productivity with the implementation of the roots or shoots of any species of legume. In the first cultivation of cabbage in the field, the application of whole plant of sunnhemp increased the production of cabbage, compared to plants grown on 100% Nmineral fertilization (N.M.F.). Growth of the roots of jack beans production decreased compared to plants grown with 50% N.M.F. The implementation of the shoot or whole plant of any of the legumes with N-mineral fertilizer can be reduced by 50% without loss of production. Areas that were left in the shoot or whole plant of sunnhemp or jack beans resulted in higher yields and therefore higher residual effects than with N-mineral fertilizer. The successive cultivation of the roots of legumes resulted in no residual effect from the different mineral fertilizer with 50 or 100% of the recommendation of N fertilizer.