Evaluation of the effect of different irrigation regimes on the growth characteristics and yield of aerobic rice genotypes in northern Khuzestan

The aim of this study was to determine the role of different irrigation regimes on flag leaf and other leaves , stem length, stem weight, average leaf length and width of aerobic rice genotypes was carried out during 2014 and 2015 in Shavoor Agricultural Research Station in northern of Khuzestan. Four irrigation regimes (1, 3, 5 and 7 days) in main plots and twelve rice genotypes in subplots with three replications. The results of combined analysis showed that there was a significant difference between genotypes, irrigation regimes and their interactions in all traits. One-day and three-day irrigation regimes had the highest and the seven-day irrigation regimen the lowest in terms of less time in nutrient accumulation in all traits. Grain yield, while having the highest positive and significant correlation (0.486 **) with flag leaf weight in terms of providing the most photosynthetic material for the main reservoir in the All genotypes tended to produce the most grain yield in the second irrigation regime (the three-day irrigation interval); genotype IR 81025-B-327-3, with 6555.10 kg ha-1 of grain yield, out-performed the remaining genotypes in this level of irrigation regime. Examination of the growth index showed that all genotypes reached their maximum growth by reducing the irrigation cycle in a shorter period of time, while more resistant genotypes maintained their growth process in the conditions of better irrigation cycle reduction, which can be due to breeding and Corrected figures used.