The Effect of Different Irrigation Regimes on The Growth Process of The Reproductive and Vegetative growth Traits of the Aerobic Rice Genotypes in the northern region of Khuzestan (Iran)

Abstract

The study was carried out and planned to determine the effect of different irrigation regimes on the growth process of the area and weight Leaf also the number of florets and panicle weight in the aerobic rice and also determining the variety of the genotypes florets of it at Khuzestan province (Iran) for two years (2014-2015). Four irrigation regimes (For 1-, 3-, 5- and 7-days interval) are placed in the main split-plots and 12 genotypes of rice in the sub-split plots by 3 repetitions. The results of the combined analysis show that there was a significant difference in all traits between genotypes, irrigation regime and the mutual effect of two factors on the level of one percent. Two irrigation regimes of the one-day and three-day intervals have the maximum value and the seven-day irrigation regime has the minimum value in the accumulation of the food material for all the traits in terms of less time. The grain yield had the highest value in the second irrigation regime and IR 81025-B-327-3 genotype with the average of 6555.10 kg for per hectare, and in addition it had the greatest positive and significant correlation (0.506**). The study of the trait’s growth process showed that all genotypes reached to their maximum growth by reducing the irrigation cycle in a less time and we observed the time reduction in the reproductive phase that had the least positive change in the last two weeks in terms of the grain’s sterility in this interval. As well as some types of this plant with the low-resistance, reduced 49% and 21%, respectively, and they were with more severe in terms of the dry weight of panicle and the number of florets in comparison of the conventional irrigation regime which can be called it as a mechanism to escape from the drought.