Industrial quality of an upland rice variety cultivated in rotation with several crops and nitrogen doses in a no-till system

Abstract

The industrial quality of rice is very important to determine its market prices, this industrial quality being understood as the amount of whole grains resulting from the mechanical hulling of the grains. Genotype, cropping system, and crop management are important agronomical factors determining the amount of whole grains resulting after grain processing. The objective of this study was to evaluate how two crop management practices could influence the industrial quality of the upland IAC 202 rice cultivar. These practices consisted of sowing the rice variety in crop succession with either millet, grain sorghum, corn, pigeon pea, crotalaria, velvet bean, or a fallow area. The areas where rice was sown were previously fertilized in topdressing with either 0; 25; 50; 75; 00, or 25 kg ha- of N. Although the species previous to rice influenced some of the evaluated characteristics, that influence was not enough to lead to significantly different industrial quality. N doses were neither capable of resulting in significantly different levels of industrial quality. The no-till system, when allowing for crop rotation, permits excellent rice industrial quality.Additional keywords: Oryza sativa L.; sprinkler irrigation; hulling yield; whole grains; broken grains.