MANEJO ALTERNATIVO DE IRRIGAÇÃO PARA O ARROZ

Abstract

Flooded rice cultivation has high water resources demand. Nowadays, due to water use conflicts among society sectors, such as, agriculture, industry and human consumption, increasing the water use efficiency in the agriculture must be an obligation. In this context, this work has as goal to evaluate irrigation rice alternative methods for reduction the amount of water consumed. As specific objective, this work intends to determine the impacts of irrigation alternative methods on crop development, yield and grain quality. An experiment was conducted at the Experimental Station of Embrapa Rice and Beans, located at Goianira, GO, Brazil. The experimental design was a splitplot randomized complete block with five replications. The main plot was composed by four irrigation managements, a) continuous flood (ICC), considered the conventional method, with continuous water depth throughout the cycle, b) intermittent flooding until flowering (IIF), and after continuous water depth , (c) intermittent flooding during the entire crop cycle (IIC, reinunduting the area after the water percolation) and (d) severe intermittent flooding during the crop cycle (SSC, soil maintained above field capacity, but no water deep). The subplot was composed by four irrigated rice cultivars (BRS Pampeira, BRS Catiana, Irga 424 and BRS A702 CL). The productivity of irrigated rice grains with intermittent management is similar or superior to conventional management (continuous flood), with lower water use and the grain quality of the cultivars differs with irrigation managemen