This study was carried out at the Research Station / College of Agriculture –University of Kirkuk during the spring season 2018, which targeted the study of the effect of adding humic acid to the soil at a rate of (0, 400) kg.h.-1 and spraying with different levels of boron (0, 15, 30) mg. L-1 in Growth and yield of two hybrids of zucchini squash Alexandria and Ardendo 174. The results showed that the addition of humic acid significantly affected plant height, evidence of chlorophyll content in the leaves, and gave a significant increase by 8.758% and 10.76%, respectively. Also, the number of female flowers increased significantly. At 7.392%, the results showed an increase in the number of
fruits, plant yields, and total yields insignificant. The results showed that the treatment with boron spray at a concentration of 15mg.L-1 gave the highest values in plant length 70.90 cm. The results showed that there were significant differences between the two hybrids. The Alexandria hybrid gave the best results in the length of the plant and total yield 84.62 cm, 19.16 Ton.h-1 while the Ardendo 174 hybrid gave the best results in the manual for chlorophyll content 31.85 SPAD, as well as the most number of female
flowers and the number of fruits per plant and insignificant in the yield of the plant 6.526 flowers. Plant-1, 5,801 fruit. Plant-1, respectively. The coefficients for binary and triple interference differ significantly in most studied traits.