RESUMO
This study analyzes the implementation costs of four models of integrated Crop-Livestock systems, with corn in tillage (Zea mays L.) intercropped with Brachiaria decumbens, without conventional tillage in the first year and subsequent years, while comparing them with two others grazing models used to rear Nellore females during the agricultural years of 2007-08, 2008-09 and 2009-10. This economic study was based on the technical coefficients matrices constructed from data gathered from an experiment on Crop-Livestock Integration (CLI) developed at the Unidade de Pesquisa e Desenvolvimento de São José do Rio Preto (SP), no Pólo Centro Norte. In this experiment, four models of rotational grazing with Brachiaria decumbens x corn in comparison to permanent pasture of Brachiaria decumbens fertilized with two levels of nitrogen fertilizers (45 and 90 kg/ha/year), with and without correction of soil acidity, respectively. The four integration models differ by the occupation of the areas during the rainy season, with the following combinations: one or two consecutive years of corn intercropped with brachiaria, followed by one or two years of grazing. During the dry season, all areas are used as pasture. The economic results were grouped into four categories with similar characteristics in terms of area occupation and management, regardless of treatment, considering the averages: P- per
O artigo não apresenta resumo em português.
RESUMO
This study analyzes the implementation costs of four models of integrated Crop-Livestock systems, with corn in tillage (Zea mays L.) intercropped with Brachiaria decumbens, without conventional tillage in the first year and subsequent years, while comparing them with two others grazing models used to rear Nellore females during the agricultural years of 2007-08, 2008-09 and 2009-10. This economic study was based on the technical coefficients matrices constructed from data gathered from an experiment on Crop-Livestock Integration (CLI) developed at the Unidade de Pesquisa e Desenvolvimento de São José do Rio Preto (SP), no Pólo Centro Norte. In this experiment, four models of rotational grazing with Brachiaria decumbens x corn in comparison to permanent pasture of Brachiaria decumbens fertilized with two levels of nitrogen fertilizers (45 and 90 kg/ha/year), with and without correction of soil acidity, respectively. The four integration models differ by the occupation of the areas during the rainy season, with the following combinations: one or two consecutive years of corn intercropped with brachiaria, followed by one or two years of grazing. During the dry season, all areas are used as pasture. The economic results were grouped into four categories with similar characteristics in terms of area occupation and management, regardless of treatment, considering the averages: P- per
O artigo não apresenta resumo em português.
RESUMO
The aim of this work was to evaluate the implementation of the Integrated Crop-Livestock (ICL) in beef cattle farms where the corn was planted directly on the pasture, under no-till system, in the first year. The Crop-Livestock Integration (CLI) models evaluated consisted of Brachiaria decumbens pastures intercropped with corn in the no tillage system. However, the evaluated CLI system differed from the usual system because it did not use the conventional tillage in the first year, while the conventional soil preparation and sowing of grass is used by most of the Brazilian farms. The results show that in the first year the period of time spent planting and side-dressing nitrogen on corn was longer compared to the following years, mainly due to the lack of uniformity of the ground surface, once no conventional tillage was used to prepare the soil and these operations were performed with own implements for direct planting. Therefore, many seeds were placed either very deep or not buried, thus compromising the crop and becoming necessary to replant the corn with a manual planter. From the second year on, even though the conditions were not ideal, the ground surface became more accessible for the sowing and cultivation of corn, after the tillage of the first year. The time spent in most operations performed was longer than usual, especially planting and side-dressing nitrogen on
O artigo não apresenta resumo em português.
RESUMO
The aim of this work was to evaluate the implementation of the Integrated Crop-Livestock (ICL) in beef cattle farms where the corn was planted directly on the pasture, under no-till system, in the first year. The Crop-Livestock Integration (CLI) models evaluated consisted of Brachiaria decumbens pastures intercropped with corn in the no tillage system. However, the evaluated CLI system differed from the usual system because it did not use the conventional tillage in the first year, while the conventional soil preparation and sowing of grass is used by most of the Brazilian farms. The results show that in the first year the period of time spent planting and side-dressing nitrogen on corn was longer compared to the following years, mainly due to the lack of uniformity of the ground surface, once no conventional tillage was used to prepare the soil and these operations were performed with own implements for direct planting. Therefore, many seeds were placed either very deep or not buried, thus compromising the crop and becoming necessary to replant the corn with a manual planter. From the second year on, even though the conditions were not ideal, the ground surface became more accessible for the sowing and cultivation of corn, after the tillage of the first year. The time spent in most operations performed was longer than usual, especially planting and side-dressing nitrogen on
O artigo não apresenta resumo em português.