MANEJO DE PLANTAS DANINHAS ATRAVÉS DE CONTROLE FÍSICO NO CRESCIMENTO DO SORGO GRANÍFERO

Abstract

Sorghum is the fifth most important cereal in the world, preceded by wheat, rice, corn, barley, it is used in energy production and in the food industry, human and animal. Northeast Brazil is used in animal feed, and a culture adapted to this region, but has its production affected by several factors, such as pests, diseases and interference imposed by weeds. Given the above objective of this study was to evaluate the efficiency of the physical weed control and its influence on the growth characteristics of the sorghum crop (Sorghum bicolor (L.) Moench). The experiment was conducted in the experimental area of the Department of Plant and Environmental Sciences, CCA UFPB. The experimental design was randomized blocks, which were applied 5 times hoeing: T1- weeded, T2 unchecked, T3-weeded 30 days after sowing (DAS), T4 weeded 40 (DAS) and T5- weeded 50 ( DAS). with four replications. For qualitative data was used the Tukey test at 5% probability to compare the means and quantitative data was used polynomial regression. Statistical analysis was employed Sisvar Software Program. It was observed that did not differ statistically the physical control methods in relation to the height of the plants so the greater height was weeding at 30 days after sowing, while the smaller the treatment without control. As for the diameter was no significant interaction between treatment and time to 1% probability, their values set to quadratic equations. The treatments performed plains have greater height, diameter and number of leaves, the presence of weeds in treatments interfere with the growth in diameter of the plant.