Sprinkler irrigation management strategies as a function of "Kc" and mineral fertilization on upland rice cropThe use of the sprinkler irrigation to reduce the risk of forfeit production, by water deficiency, and increase yield, encouraging to use of the tecnologies like mineral fertilizer. With the objective of evaluate the effects at sprinkler irrigation management strategies based on crop coefficient (Kc) and mineral fertilizers on the performance upland rice, cv. IAC 201, two experiments were conducted. The experimental design was a randomized blocks and treatments consisted of five water management strategies: natural rain and four water supplied by sprinkler irrigation. Irrigation management were based on Kc for dryland rice that resulted in water management 2 (M2). Water management M1 and M3 were then defined as 0.5 and 1.5 Kcs used in M2, respectively. In 1995/96 same treatments were applied in a split-plot scheme, where subplots consisted of two NPK-fertilization levels (AD1 - 12 kg ha-1 of N, 90 kg ha-1 of P2O5 and 30 kg ha-1 of K2O kg ha-1, and AD2 - 24 kg ha-1 of N, 180 kg ha-1 of P2O5 and 60 kg ha-1 of K2O ha-1). Low water availability during the vegetative phase increased plant cicle and reduced plant height. Low water availability among panicle primordial differentiation and booting stages decreased number of spikelet for panicle. The highest grain yield was obtained under water management using 1,5 of the recommended Kc value. Nutrient levels did not affect the crop response for sprinkler irrigation management strategies.
Oryza sativa L.; water levels; yields components; levels fertilization
