Influência da variação da temperatura da água no arroz irrigado.

Abstract

976/5000 In order to determine the effects of high temperature on irrigated rice (Oriza sativa L.), an experiment was carried out using sand substrate and nutrient solution. The plants were subjected to the maximum temperatures of 30, 35, 40 and 45 C. The parameters used to verify the rice behavior were the final root length, wet and dry root weight, final plant length, shoot development. number of panicles and tillers, wet and dry grain weight, negative cycle duration and nitrogen, phosphorus and potassium absorption. It was found that the high temperatures significantly affect the considered variables, influencing the production as a consequence of the negative interference of high temperature on the vegetable components during the whole crop cycle. There was also a reduction in the total absorption of nitrogen, phosphorus and potassium as well as blockage in the translocation of nutrients in plants.