Aduba??o verde com crotal?ria consorciada ao milho, com colheita de minimilho, antecedendo a alface e a couve-folha sob manejo org?nico

• Ano de defesa: 2011
• Autor(a) principal: Corr?a, Andr? Luiz
• Orientador(a): Abboud, Antonio Carlos de Souza
• Banca de defesa: Ribeiro, Raul de Lucena Duarte, Santos, Ricardo Henrique Silva
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal Rural do Rio de Janeiro
• Programa de Pós-Graduação: Programa de P?s-Gradua??o em Fitotecnia
• Departamento: Instituto de Agronomia
• País: Brasil
• Palavras-chave em Português: minimilho; agricultura org?nica; plantio direto
• Palavras-chave em Inglês: baby corn; organic agriculture; no-tillage system
• Área do conhecimento CNPq: Agronomia
• Link de acesso: https://tede.ufrrj.br/jspui/handle/jspui/3926

Two experiments were conducted to evaluate the effect of green manuring through intercropping of sunnhemp (Crotalaria juncea) with corn for production of baby corn (immature ears), preceding lettuce and kale production under organic management. The first experiment, in the Campo Experimental de Avelar ? CEA, of PESAGRO-RIO, in Paty do Alferes, in the state of Rio de Janeiro, Brazil, was done in a randomized block design where the treatments consisted of green manure pre-crops of corn, intercropping of corn with sunnhemp, sunnhemp and spontaneous vegetation. During the growth of these crops, the harvest of baby corn was done. After cutting the plants, lettuce (cv. Vera) was planted over the stubble produced. The corn monoculture yielded productivity, a commercially viable number of immature ears, as well as a greater number of ears per plant; however, in relation to the length and diameter of the ears, there was no difference to the intercropping. The biomass production provided by the intercropping of sunnhemp and corn was always greater than for the corn monoculture and the spontaneous vegetation, and equivalent to the sunnhemp monoculture. In relation to nutrient accumulation, the intercropping was superior to the corn monoculture and the spontaneous vegetation for N, superior to the sunnhemp monoculture and the spontaneous vegetation for P, and equivalent to the other treatments for K, Ca, and Mg. Direct planting (no-tillage) over the stubble of the sunnhemp or the intercropped corn with sunnhemp gave superior yields for the lettuce. The second experiment, in the Sistema Integrado de Produ??o Agroecol?gica ? SIPA (UFRRJ/Embrapa Agrobiologia/PESAGRO-RIO), in Serop?dica, in the state of Rio de Janeiro, which also had a randomized block design, combined treatments of green manure crops consisting of corn, intercropping of corn with sunnhemp, and sunnhemp, with two planting methods in a scheme of subplots. During the growth of these crops, the baby corn harvesting was done. After cutting the plants, kale (F1 hybrid Hi Crop) was planted using both no-tillage and conventional tillage and this provided 21 weekly harvests. The corn monoculture yielded productivity, a commercially viable number of ears, as well as a greater number of ears per plant; however, in relation to the length and diameter of the ears, there was no difference to the intercropping. Biomass production provided by the intercropping of sunnhemp and corn was greater than for the monoculture. The accumulation of nutrients provided by the intercropping was always greater than for the corn monoculture and greater than or equal to the sunnhemp monoculture. The no-tillage management provided comparable productivity and kale leaf growth greater than for the conventional tillage. For both the lettuce and the kale, the option of green manuring through intercropping of corn with sunnhemp had the advantage of harvesting baby corn and the management system adopted allowed most of the nitrogen in the systems to remain. Soil fertility was also evaluated by collecting soil samples at different times. There was an effect on the pH and levels of Ca+Mg and K.