INTERACTED EFFECT OF HUMIC ACID AND SPRAYING DIFFERENT CONCENTRATIONS OF NANO ZINC OXIDE AND ZINC OXIDE ON THE GROWTH AND YIELD OF ONION (ALLIUM CEPA L.)

Abstract

This factorial field experiment had been conducted in 2019 at Al-Jazeera township in Al-Garma district (Anbar province, Iraq) according to Randomized complete block design to investigate the influence of foliar application of Humic Acid (H0 = 0 mg HA L-1 and H1 = 500 mg HA L-1), the formulas and concentrations of sprayed Zinc which are (Zn0 = 0 mg Zn L-1; ZnN = 20 mg Zn L-1 as Nano-particles zinc oxide; ZnNC = 20 mg Zn L-1 as Nano-particles zinc oxide with Chelated material (EDTA); ZnT = 100 mg Zn L-1 as Traditional zinc oxide) on growth and yield indicators of onion. The results of the study showed a powerful increase when spraying HA and all the different zinc formulas in all the studied properties, the interaction of the study’s factors also increased significantly with H1ZnN interference treatment achieved the highest values in zinc concentration in the leaves and protein content and with an increase of 127.8 % and 15.40 % whereas the treatment H1ZnNC achieved the highest values in plant height, the number of leaves, leaf area, root length, bulb thickness, zinc concentration in the bulbs and in the bulbs yield at the time of treatment with an increase of 34.02%, 84.21%, 69.63%, 53.30, 51.21%, 134.20%, and 39.91%. successively compared to H0Zn0, the same treatment H1ZnNC achieved the highest value of fertilization efficiency of 66.41% in succession compared to H0 ZnT.