Doses de calcário calcítico e dolomítico e efeitos no desenvolvimento, produção e qualidade de grãos de arroz de terras altas

Abstract

This study aimed to evaluate the effect of limestone doses and dolomite in the development, production and quality of rice grain highlands. The experiment was conducted in a greenhouse at the Federal University of Mato Grosso in the University Campus of Sinop MT in the year 2015. The soil used was from 0-20 cm of native forest, which was classified Oxisol dystrophic. The experimental design was a randomized entirely (DIC) in 2x5 factorial with five replications, two limestone (calcite and dolomite) and five doses - 0.0; 2.0; 4.0; 8.0; 12.0 t ha -1 The plots consisted of plastic pots 10.0 dm 3 , kept close with humidity of 80% of field capacity through daily weighing vessel. During the experiment were evaluated: number of tillers, number of panicles. At the end of the experiment, the plants were chosen for the determination of the dry matter of tillers and panicles. After drying, the panicles were threshed and obtained the dry matter of grain, and then proceeded to the grain quality analysis (entire yield and broken and income). From the results it is concluded: a) the upland rice responds to application sources and lime rates; b) the application of limestone promotes gains in morphology and grain quality, and, c) the addition of dolomitic limestone affect the quality of the grains, reducing the density of grain, increasing the proportion of broken, reducing the yield benefit.