RESPONSE OF DIFFERENT GENOTYPES FROM RICE (Oryza sativa L.) TO DRY CULTIVATION UNDER DIFFERENT IRRIGATION METHODS

Abstract

This study aimed to determine the water requirements and grain yield for rice (Oryza sativa L. ) using 16 genotypes of aerobic rice had gotten from the International Rice Research Institute in Philippine and two local genotypes (Anbar 33 and Yasamin) under three irrigation methods namely flooding, alternate wetting and drying and sprinkler. Randomized Complete Block Design (RCBD) was used with four replicates. In flooded irrigation a constant depth of 0.05-0.1 m water covered soil surface through the growth season. Whereas in AWD and sprinkler irrigation methods water was applied when the average of soil water potential (SWP) reached 30kpa and 50 kpa respectively, at the 0.30 m depth and then bring it back to the saturation. Alternate wetting and drying and sprinkler irrigation methods reduce the quantity of irrigation water by 34.8% , 42.1% respectively, as compared with flooded irrigation which gave the largest water consumption 2286 mm. season-1. There were significant differences between flooded and sprinkler irrigation method for grain yield  4723.1 , 3656.9 kg.h-1 respectively. Wherease, there were nonsignificant differences between flooded and alternate wetting and drying methods which was closely to 89.7%. Therefore, the use of modern technologies for irrigation methods such as alternate wetting and drying and sprinkler irrigation and the use of new genotypes of rice tolerant to drought (Aerobic rice) are effective ways to increase yield and to save irrigation water for the save of water resources management strategy to combat the current deficiency in water resources