Effect of detasseling and spraying of gibberellic acid in the growth and yield of some subspecies of yellow corn

الملخص EN

A field experiment was conducted during the Autumn Agricultural season for 2017 in two fields of yellow corn farmers in Babylon province with two locations, The first one in the center of Al-Hillah city within the latitude line 32.2513° north and longitude line 44.2352° east, the second in Abu Gharq within the latitude line 32.3146° north and longitude line 44.2217° east, to study the response of three subspecies of yellow corn are (Sweet corn and oily corn and Dent corn), Detasseling, Spraying of Gibberellic acid with a concentration of (100 mg.L-1 ) and their interaction treatments in growth of yellow corn (Zea mays L.) and grain yield, The experimental treatments were distributed in the factorial experiment according to the Randomized Complete Block Design (RCBD), with three replicates.

The first factor included three subspecies of yellow corn are (Sweet corn and oily corn and Dent corn), The second factor was the Detasseling for the plants of the two intermediate lines of each treatment when the lateral vegetative bud is transformed into a tasseling.

The third factor was the spraying of Gibberellic acid at a concentration of (100 mg.L-1 ), The results showed that there was a significant response to subspecies of yellow corn and spraying of Gibberellic acid in most growth and yield indices.

The treatment of subspecies oily corn, the Detasseling and spraying of Gibberellic acid at the concentration of (100 mg.L-1 ) was excelled by giving it the highest averages in the indices of vegetative growth, the height of the plant and the number of total leaves and the leaves content of total chlorophyll pigments while the Dent corn treatment was excelled in the number of grains in the plant, the number of grains in the cob, the weight of 500 seeds, the grains yield and the productivity of the plant amounted of (172.1, 188.4 cm.plant-1 , 13.72, 13.90 leaf.plant-1 , 73.89, 77.62 SPAD, 622.1, 1.80, 1.87 cob.plant-1 , 424.2, 436.4 grain.cob-1 , 157.9 162.8 g, 93.93, 78.92 g.plant-1 and 4.978, 4.182 ton.ha-1 ), respectively