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Leguminosas em consórcio com milho segunda safra e o seu efeito no manejo do nitrogênio na soja e arroz de terras altas cultivados em sucessão

  • Gerlach, Gustavo Antonio Xavier
Publication Date
Dec 22, 2017
Repositório Institucional UNESP
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The high rates of decomposition of organic material in tropical regions has been one of the problems for the maintenance and sustainability of the no-tillage system, due to the need to produce large amounts of straw and nitrogen immobilization in the no-tillage system. The intercropping of green manure in maize can produce more dry matter than in single crops. In this condition the crop consortium is a alternative to supply the annual straw supply and supply nitrogen to crops. Depending on the C/N ratio of the straw that has an area, there may be less nitrogen availability for the soybean crop. The cultivation of legumes with the maize crop can supply this nitrogen deficiency due to the greater nitrogen fixation. In rice cultivation with the inoculation of Azospirillum brasilense it was able to take advantage of the nitrogen in the area, with nitrogen fertilizer economy. Thus, the objective of this work was to study the effect of legumes in intercropping with maize crop 2 nd crop for dry matter production with intermediate C/N ratio and later to verify its effect on the nitrogen supply to the soybean crop with and without nitrogen fertilization and the greater use of nitrogen for upland rice cultivation with and without inoculation of Azospirillum brasilense. The research is made up of three subprojects and was developed at the experimental farm of UNESP - Ilha Solteira Campus. The experimental design was a randomized complete block design with 4 replicates and 10 treatments consisting of the effect of the cultural remains of maize, estilosantes, Pigeon pea and Crotalaria spectabilis. The experimental design for soybean and rice in succession to maize will be a randomized block design in a 10x2 factorial scheme with the treatments constituted by maize and green manure crop residues and the presence and absence of nitrogen fertilization in sowing for Soja and presence and absence of inoculation with Azospirillum brasilense for rice cultivation. It was concluded that the intercropping with the green manures did not interfere in the maize productivity and there was an increase in total dry matter after maize harvest and reduction of the C/N ratio of the intercropping treatments; The maize and legume consortium inoculation with Azospirillum brasilense and the absence of nitrogen at sowing influenced rice yield; and the production components and yield of soybean respectively. The highest financial returns was observed in maize intercropping with stylers and pigeon pea in simultaneous sowing and by the inoculation of Azospirillum brasilense in rice and absence of mineral nitrogen in soybean sowing

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