Crescimento e períodos de decomposição de plantas de cobertura e seus efeitos sobre a supressão de plantas infestantes no Amazonas

Abstract

The productivity of citric plants has not reach their maximum potential due to the action of various biotic factors that directly affect agricultural profitability. These factors have great importance interference from infesting plants. The objective of this study was to evaluate the growth and periods of decomposition of plant cover and its effects in the management of weeds in the orange orchard of Amazonas. The research was performed in Citrus Farm IMF, road of Procopius, located at km 112 on highway AM 010, city of Rio Preto da Eva-AMs. The experimental design was a randomized block design with 6 treatments and 4 replications. Treatments with plant covers were as follows: millet, pork beans, turnip, brachiaria millet mixture over and pork bean producer (control) management. The weed community, growth and dry matter production for coverage and the rate of degradation of the vegetation cover by the methodology of litter bags were evaluated. Cover crops showed good dry matter production except the turnip. The highest rates of decomposition occurred in the first 28 days, especially the turnip that had large losses in the initial stage and after these periods, there was a stabilization in the rate of decomposition of the remaining biomass. Brachiaria, pork bean and mixing showed higher half-lives proving to be good alternatives for ground cover.