Clorofila e rendimento de grãos da cultivar de feijoeiro IAC milênio em sistema de integração lavoura pecuária

Abstract

The livestock farming integration system seeks the sustainable development of agriculture, as it is based on some pillars that provide a dynamic production model and reuse the resources generally used in a conventional system. The fertilization in a conventional crop system is done in the grains culture, but in a crop integration system, because of the nutrient dynamics, the fertilization is also used in the winter pasture and not only in the grain crop to be cultivated. Implanted in the summer. Nitrogen, in turn, is the nutrient of higher demand for beans (Phaseolus vulgaris L.), and has high relation with the chlorophyll content in the leaf. In the agricultural environment, tools are used that help in the detection of the nutritional state of plants, for later use in the management of fertilization, reducing wastes and maximizing the productive results. However, these methods often require great time and end up not helping decision making in the same crop. The experiment was carried out in an integrating cattle breeding system, in Abelardo Luz-SC, in the trifactorial scheme 2 x 2 x 4, in subdivided plots. In the main plot were allocated the combinations of two heights of grazing and two times of application of nitrogen; And, in the subplot of four nitrogen doses, in the randomized block design, with three replications. The chlorophyllometer (ClorofiLOG®, model CFL 1030) was used to evaluate the chlorophyll content in the vegetative stage V4 and reproductive R5, R6 and R7 of the bean plant, in three thirds of the plant, to evaluate the effect of the treatments on the contents Chlorophyll and yield components. The evaluations of the chlorophyll content were carried out in 5 plants per plot, marked in the lower, middle and upper third, in the central leaflet. After the plants were harvested and evaluated the yield components, such as: plant height, height of first pod insertion, number of pods per plant, number of grains per pod, number of grains per plant, weight of grains per plant, Thousand grain weight and productivity. The assumptions of the anova were verified and the analysis of variance in a trifactorial scheme, 2 x 2 x 4, in subdivided plots, in the DBA, at a level of 5% of probability of error, were performed, and the interactions were unfolded using regression analysis For nitrogen doses and Duncan test for grazing heights and times of nitrogen application. Statistical analyzes were performed in the GENES program.