Study of yeild and physiological responses of corn new hybrids under irrigation volumes

In order to investigate the effect of irrigation volumes under drip irrigation condition on grain yield and morphological parameters of corn cultivars, an experiment was conducted during 2018 and 2019 in Gorgan agricultural research station. The experiment was laid out in a randomized complete block design in form of split plot factorial experiment and replicated three times. Treatments were including three irrigation volumes [Irrigation at %100 (I1), %75 (I2) and %50 field capacity (I3)], as A factor, and varieties (SC704, SC705 and SC706) as B factor. The results of analysis varians showed that; effects of irrigation treatments on yield and yield components was significant at %1 probablity and the difference between Varieties was significant at %1 probablity, but intraction effects of two treatments on yield and yield components was not significant. Investigation of grain yield at irrigation treatment showed, the highest yield of I1 treatment was 7.85 ton ha-1, and reduced by %15.03 and %29.68 respectively when the irrigation interval was reduced by 75% to %50 field capacity. Comparison of grain yield at varieties showed, yield of single cross 706 with 7.03 ton ha-1 was%12.84 and %3.68 higher than single cross 704 and single cross 705 respectively. Interaction effect of irrigation value and variety showed, the most grain production was belong treatment of single cross 706 and irrigation at %100 field capacity. Investigation of WUE of showed, irrigation at %75 field capacity and single cross 706 with WUE of 1.15 kg m-3 grain yield had the most WUE compared to other irrigation treatments and varieties. With dimitation of irrigation, plant height and ear length also decreased.