Effect of Kinetin on Water use efficiency of Corn under skipping irrigation

Abstract

A field study was conducted during two seasons (Spring and Autums) 2014 at the experimental farm of Field crop Department, College of Agriculture, University of Baghdad_ Abe Grebe to study effect of Kinetin on water use efficiency of corn under skipping irrigation. By using Randomized Complete Block Design with split–plot, with three replicates. Skipping irrigation at elongation (T2), emergence of areanas T3, 10% flowering feminization T4, milk stage T5, and dough stage T6. All these treatments were irrigated when 85% of the available water was depleted with control treatment T1 which was irrigated when 50% of the available water was depleted , were assigned as a main plots while the Kinetin spray in the six and ten leaves stages K1, K2 in addition to without spray K0 treatment were assigned as a sub-plots. The results showed that highest values for evapotranspiration in spring season was 7.57 mm day-1 were observed when skipping irrigation at 10% flowering feminization compared with 7.57 mm day-1 at the same stage at the control treatment. While the highest values for evapotranspiration in Autum season was 7.58 mm day-1 at emergence of Areanas compared with 8.24 of the control treatment at the same stage. The results also showed that the highest value for the coefficient of the crop found when the two phases of the emergence of Aeranas and 10% flowering female for the treatment of measurement (T1) stood at 1.22 and 1.29 in the spring season and 1.00 and 1.25 in the autumn season, while it decreased crop coefficient values when the plant offering age-even up to less value when the phase dough phase amounted to 0.67 and 0.81 for both the spring and autumn seasons in succession.