Fitorregulador no tratamento de sementes de cultivares de arroz irrigado e biótipo de arroz vermelho

Abstract

Rice is one of the most important components in meals of thousands of people around the world. Brazil ranks among the major producers of rice and the state of Rio Grande do Sul is reference in rice-growing activity. However, its production can still grow, as productivity in crops is below those obtained in the experimental areas. One reason for this low productivity is due to the inadequate management of weeds that are competing for resources essential. One of the main weed plants in rice crop is red rice. Phytoregulator vegetables are substances that can improve growth plant and stimulate cell division to assist in seed germination, thus making a cultural method of weed control due to rapid germination and crop establishment. The objective of this study was to evaluate morphological and physiological variables by using phytoregulator in seed treatment of rice cultivars and red rice biotype. The experimental design was completely randomized with bifactorial arrangement (4x3) with four replications. We used seeds of 3 cultivars of irrigated rice, a biotype of red rice and 2 concentrations of the regulator Stimulate® and the control treatment consisting of treatment with distilled. The collected data was subjected to analysis of variance and analyzed by DMS Fisher test. The regulator cause influence of rice cultivars positive or negative, according to the cultivars. When Stimulate® is used in red rice biotype, not interfering in germination, but the other variables the weed averages higher than cultivars when used at rate 1,2 L. of product.