The effect of complementary irrigation in different growth stages on yield, qualitative and quantitative indices of the two wheat (Triticum aestivum) cultivars in Mazandaran

In most wheat growing moderate regions and especially in the north of Iran climate, is affected grain filling period by several physical and abiotic stresses. In this region, grain filling often occurs when temperatures are increasing and moisture supply is decreasing. The study was carried out in Agricultural Research farm, Jouybar Branch in 2007-2008. Four irrigation treatments included (I ) no irrigation (check); (I ) 0 1 one irrigation (50 mm) at heading stage; (I ) two irrigation (100 mm) at heading and anthesis stage; and (I ) 2 3 three irrigation (150 mm) at heading, anthesis and early grain filling growth stage, two wheat cultivars (Milan and Shanghai) were used the experiment. Totally raining was 453 mm during the growth season. The results indicated that biological yield, grain yield and harvest index were significantly affected by irrigation levels. I treatment produced more tillers number / m , fertile tillers number / m , harvest index and biological 3 2 2 yield. Milan cv. produced more tillers number / m2, fertile tillers / m2, while Shanghai cv. produced heavier tillers and 1000grains weight. Plant height was significant in wheat varieties, while were not statistically significant under irrigation levels. Milan produced more grain yield, harvest index and biological yield. Grain yield 5228 (21%), 5460 (27%) and 5670 (29%) kg haG1, under I , I and I , respectively. There was an interaction of 1 2 3 irrigation and cultivars on grain yields. In the absence of the irrigation 1000 grains weight was reduced from 45 to 40 g. No irrigation reduced soil moisture extraction during the grain filling stage. It is concluded from research work that wheat crop irrigated Milan cultivar could increase the grain yield in comparison with Shanghai cultivar. Although, the grain yield of Shanghai under irrigation was slightly lower than Milan. The best result was produced by I treatment. I and I treatments were not significantly difference with I 1 2 3 1 treatment. Therefore, I irrigation was better than I .

Wheat % Anthesis % Supplementary irrigation % Grain yield