Adubação orgânica e densidade de plantio alterando a fisiologia, produção e incidência de pragas no rabanete

Abstract

The radish can be grown in conventional or organic production system. This system of production as opposed to the conventional system, combined with the study of plant density, can make the form of radish cultivation even more sustainable. The objective of this study was to evaluate the effects of organic fertilization and planting density on growth, physiology, productivity and green aphid infestation in radish plants. The experiment was conducted in the Horta Didática of the Federal University of Ceará. The treatments were arranged in a completely randomized design, arranged in a 5 x 2 factorial scheme, with five doses of organic compound (0; 45; 60; 75; 90 ton.ha-1) and two plant densities per hole (one and two plants) with six replicates. It was determined the fresh mass of the aerial part and root, length and diameter of tubera, total length of the root, total productivity of tubers, gas exchanges, population survey of green aphid in the area besides the occurrence of other pests in the culture. The increase in organic fertilization rates resulted in an increase in crop productivity as well as in gas exchange parameters. The planting density affected the physiological and productive parameters, with a yield of approximately 4.43 and 7.09 ton.ha-13 in the density of one and two plants per hole, respectively. There was an increase in the population of green aphids as the level of fertilization increased, and there was a negative correlation between the density of aphids in relation to the incidence of leafminer in the crop. It is concluded that fertilization and density of radish cultivation affect crop growth, physiology, productivity, green aphid population and leafminer incidence.