Impact of foliar application by urea phosphate and salicylic acid on the growth and seed yield of Allium cepa L.

Abstract

Abstract A field experiment was conducted in the agricultural season 2011-2012 in the vegetable field of the Department of Horticulture and Landscape Gardening – College of Agriculture - University of Baghdad to observe the impact of each salicylic acid and urea phosphate on the growth and seed yield of onion plant var. Texas Early Grano. The plants sprayed with different concentrations of salicylic acid (0,100,200 mg. L -1) (S0, S1, S2) and urea phosphate (urea 18%, P2O544%) (0, 2.5,5 gm.L-1) (P0, P1, P2) until the complete wetness for four times at the beginning of each month, starting from 1st of December, the experiment was designed under factorial arrangement within RCBD (3X3X3). The statistical analysis showed the significant results of the sole factors. S2 treatment gave the highest numbers in Umbel's diameter and Setting percent (7.789 cm) (78%) respectively. P2 treatment demonstrated more superiority in all the experiment parameters, such as plant seed yield and weight of 1000 seeds (28.42gm.) (3.889gm.) in sequence ,while the interaction treatments showed a distinct findings precisely S2P2 treatment which showed significant results in all parameters ,such as reducing the number of days required for seed maturity (day) germination vigor (210.3day) (80.33%).