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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Manejo org?nico da cultura da couve em rota??o com o milho, consorciados com leguminosas para aduba??o verde intercalar em plantio direto. / Organic management of collard greens in rotation with corn intercropped with green manure legumes in no tillage system

Silva, Edmilson Evangelista da 17 March 2006 (has links)
Made available in DSpace on 2016-04-28T14:58:37Z (GMT). No. of bitstreams: 1 2006-Edmilson Evangelista da Silva.pdf: 1489224 bytes, checksum: dd161137d6e6f221ffe192912c264f26 (MD5) Previous issue date: 2006-03-17 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Human being has been searching for health foods and environmental conservation in a crescent path. Is this way, organic agriculture activities are showing good results. Nevertheless, several techniques need to be improved for farm adoption. The objective of this work was to evaluate a collard greens and green corn rotation intercropped with legume plants for green manuring in a no tillage system. This work started in May 2003 with the rotation of collard-corn-collard for two years in a SIPA (Integrated Agroecological Production System, Serop?dica, RJ). Mucuna deeringiana and Crotalaria spectabilis intercropped with collard, and C. juncea e M. pruriens intercropped with corn were used. Surface application of 0 and 200 kg ha-1 N-equivalent as poultry bed manure at 6th and 16th harvesting time (100 kg in each application) in 2003; 0 and 100 kg ha-1 of N at 10th harvesting time in 2004 for collard were used. The experimental design was a randomized complete block design, a factorial 3 x 2 with four replications. Treatments were kept in the same plots during all three cropping periods. Leaf number, yield, specific leaf area, leaf area index, and nutritional analysis were performed for collard, as well as number of corn spikes and nutritional status for corn. In the second collard cropping year chemical analysis and chemical fractionation analysis of soil were performed. Plant biomass, legume plant nutrient level, and biological nitrogen fixation (BNF) rate were determined. M. deeringiana and C. spectabilis yielded 1.5 Mg ha-1 of dry plant biomass where intercropped with collard, but BNF was significantly higher for Crotalaria sp. M. pruriens over C. juncea yielded 2.8 and 5.6 Mg ha-1 of dry plant biomass respectively where intercropped with corn. The presence of legume plants intercropped with collard promoted higher numbers of leaf and yield in 2003 and 2004. In 2004, collard leave from plots intercropped with M. pruriens were larger and more turgid, and with better nutritional status. Surface fertilization for collard increased yield, leaf number, leaf area index, and specific leaf area. Residual fertilization from collard cropped in 2003 affected positively corn plants, but there was no residual effect from legumes. Corn plants showed nutritional N deficiency symptoms. This indicated that residual effect from surface fertilization or green manuring were not sufficient for N supply to the crop. Soil carbon level increased on green manure and poultry bed surface fertilization plots. Preference for humin and humic acid formation, and higher levels of N, P, K, Ca e Mg occurred on places where surface organic fertilization was performed. Levels of Ca, K, carbon, and humin occured from starting to the ending point of the second cycle of collard cropping period, demonstrating the enrichment of the soil fertility. / O ser humano tem buscado cada vez mais alimentos saud?veis e a conserva??o do meio ambiente. Neste sentido, a agricultura org?nica em suas atividades tem conseguido bons resultados Entretanto, v?rias t?cnicas ainda devem ser aferidas para que pr?tica seja adotada pelos agricultores. O objetivo do trabalho foi avaliar a rota??o couve e milho verde em cultivo intercalar com leguminosas para aduba??o verde, em plantio direto. O trabalho iniciou-se em maio de 2003 com rota??o couve-milho-couve por dois anos no SIPA (Sistema Integrado de Produ??o Agroecol?gica, Serop?dica, RJ). As leguminosas utilizadas foram Mucuna deeringiana e Crotalaria spectabilis em cons?rcio com a couve; C. juncea e M. pruriens com milho. Aduba??o em cobertura com cama de avi?rio nas doses equivalentes a 0 e 200 kg ha-1 de N na 6a e 16a colheita (100 kg em cada cobertura) em 2003 e 0 e 100 kg ha-1 de N na 10a colheita em 2004 nos cultivos de couve. O delineamento foi em blocos ao acaso, em fatorial 3 x 2, com quatro repeti??es. Os tratamentos foram conservados nas mesmas parcelas durante os tr?s cultivos. Na couve, foram analisados o n?mero de folhas, produtividade, ?rea foliar especifica, ?ndice de ?rea foliar e an?lise nutricional. No milho produtividade, n?mero de espigas e estado nutricional. No segundo ano de cultivo de couve foi realizada an?lise qu?mica e fracionamento qu?mico do solo. Nas leguminosas determinouse a biomassa produzida, teor de nutrientes e taxa de fixa??o biol?gica de nitrog?nio (FBN). Nos cultivos consorciados de couve as leguminosas M deeringiana e C. spectabilis aportaram cerca de 1,5 Mg ha-1 de mat?ria seca, entretanto a FBN foi significativamente maior para as esp?cies de Crotalaria spp. No milho as leguminosas promoveram aporte significativo de mat?ria seca, destacando-se M. pruriens sobre C. juncea com produtividades de 2,8 e 5,6 Mg ha-1, respectivamente. A presen?a das leguminosas em cons?rcio com a couve promoveram aumentos no n?mero de folhas e na produtividade em 2003 e 2004. As folhas de couve em 2004, nos tratamentos com M. pruriens, eram maiores e mais t?rgidas, al?m de estarem em melhor estado nutricional. A aduba??o em cobertura na couve aumentou a produtividade, n?mero de folhas, ?ndice de ?rea foliar e ?rea foliar espec?fica. As plantas de milho aproveitaram a aduba??o residual de 2003 na couve, mas m?o foi detectado efeito residual das leguminosas. Nutricionalmente as plantas de milho se encontravam deficientes em nitrog?nio, indicando que o efeito residual, tanto da aduba??o em cobertura e aduba??o verde, n?o era suficiente para suprir a cultura. Houve aumento no teor de carbono do solo no manejo com aduba??o verde e com aduba??o em cobertura com cama de avi?rio. Houve prefer?ncia na forma??o de huminas e ?cido h?mico, e maiores teores de N, P, K, Ca e Mg nos locais onde foi realizada aduba??o org?nica em cobertura. Do in?cio para o final do segundo ciclo de couve houve aumento nos teores de Ca, K, carbono e humina, demonstrando o enriquecimento da fertilidade do solo.

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