Diyala University, Education for Pure Sciences College, Biology Department, Diyala, Iraq Corresponding Author: Amjad Shaker Hammoud

Abstract

In the spring season of Iraq / Diyala Governorate in the year 2023, work experiments were conducted on soil with a mixture of clay and sandy Maize plant (Zea mays L.) textures to study the growth response of the synthetic class 5018, according to the randomized complete block design (R C B D) in the Abi Saida district / Abu Sebaa village, located 60 km northeast of the governorate center (Baquba). The study included sowing dates 3/15, 4/1 and 4/15/2022, and foliar Nutrition of two levels of humic 2- and as well as Control. The results showed that the dates 15/4 and 1/4 -1 3-ml L were superior in plant height and number of leaves, with an average of compared to the date 3/15, -1 210.91, 193.16 cm, 15.00, and 15.22 leaf leaf, respectively. -1 which reached the lowest mean is 175.83 cm, 14.86 cm The date 15/3 excelled in stem diameter with an average of 2.64 cm, compared to the two dates 1/4 and 15/4, which recorded the lowest average were superior in all -1 of 2.19 cm. The concentrations of humic 3- and 2-ml L studied traits, especially (Leaf area index) and (Shoot dry weight), as they -1 recorded the highest mean of 30.23, 27.82, 134.50, and 118.30 g plant compared to the control. The overlap between appointments and humic acid showed no significant differences in most study indicators