Influência da época de entrada de água na aplicação da ureia e no crescimento do arroz irrigado

Abstract

Rice is one of the most important foods for human nutrition, being the staple food of more than three billion people. The Rio Grande do Sul stands out as the largest national producer, accounting for over 61% of total production in Brazil, followed by Santa Catarina with production around 9%. This large volume produced in the two southern states, totaling about 70%, is considered stabilizer for the Brazilian market and ensures the supply of this grain to the Brazilian population. The objective of this study is to evaluate three cultivars of rice, subjected to water inlet times and ways of nitrogen application. We conducted three experiments in completely randomized design with six treatments and four repetitions. The experiments were made by rice cultivars Guri, PUITA Inta Cl and Irga 409. The treatments were six times the water intake: T1 water intake the day before; T2 input water after the application of urea; T3 water intake a day after the application of urea; T4 water intake two days after the application of urea; T5- water inlet four days after the application of urea; T6- water intake six days after the application of urea. For variables, plant height, dry weight of shoot and tiller numbers, we can report that to cultivate Guri was significant only for plant height. As for the growing PUITA Inta Cl indicated significant height and tiller number, however cultivating Irga 409, showed no significance to any variable analyzed. We conclude that each rice genotype responds differently to managements that are applied and that each of these genotypes should be evaluated on the production site, it will have the effect of environment that will assist in the loss of N.