The Effect of Boron, Humic Acid and Interference on Water Productivity and Yield of Cauliflower (Brassica Oleracea)

An experiment has been carried out at field in Gardmalla/Qushtapa with reading GPS (longitude 440035E, Latitude 360023N) ,414 meter above sea level, 15.5 Km far Southern of Erbil city during the Winter season of 2017 to test the effect of application humic acid in soil and spraying boron on the growth and productivity of water on cauliflower. Factorial experiment 3 (humic acid) (0, 10 and 20 kg ha-1 using) × 4 (boron foliar) ( 0, 0.5, 1.0, and 2.0 kg B ha-1 ) using solid snow cultivars in RCBD with three replicates. Planting solid snow cultivars was done on 11/7/2017 (seeding date), 10 /8 /2017 (transfer to field) and 22/12/ 2017 picking or harvesting date. Irrigation water was applied at 35% depletion to the depth of total plant root and calculate the depth of water applied up to field capacity. Irrigation system is surface flow irrigation through line pipe provided with meter gages for measuring water applied. The results show that the application of boron and humic acid increase significantly all growth and yield parameters of cauliflower improved the highest values of leaf length (cm), leaf width (cm) and chlorophyll content (mg/cm2), recorded 47.67 cm, 28.45 cm and 40.66 mg/cm2; 75.39 cm, 37.55 cm and 43.11 mg/cm2 and 80.0 cm, 40.29 cm and 47.33 mg/cm2 in treatment 2 kg ha-1 of boron foliar and 0, 10 and 20 kg ha-1 of humic acid addition, respectively. The values of curd weight (kg), curd diameter (cm) and total yield (Mg/ha) values were 0.97 kg, 19.45 cm and 25.38 Mg/ha; 1.33 kg, 22.33 cm and 32.66 Mg/ha and 1.40 kg, 23.78 cm and 36.53 Mg/ha in treatment 2 kg ha-1 of boron foliar and 0, 10 and 20 kg ha-1 of humic acid application, respectively. Values of water productivity (Kg/m3) ranged between 6.25 to 12.18 Kg fresh (green) curd m-3 water applied