| Abstrakt: |
Macronutrients and micronutrients are one of the factors affecting the production of field crops, especially in soils that are deficient or have problems in its nutrient's availability or absorption by the plant. Thus, two field experiments were carried out during the spring and autumn seasons of 2016 in Basrah governorate, in a silty clay soil with an electrical conductivity of 7.5 dS m-1 and soil acidity 7.6. Nitrogen was studied as one of the macronutrients added to soil at levels 50, 100, 150 or 200 kg N ha-1 and one of the micronutrients (zinc) at levels 0, 50, 100, or 150 mg Zn l-1 added as foliar spraying. The results showed that nitrogen significantly affected the plant height (for the autumn season only), number of grains in the ear, weight of 500 grains (for the spring season only) and total yield. Plants fertilized by 150 kg N ha-1 gave the highest grain yield in the spring season attained 5974.0 kg ha-1, while the nitrogen level 200 kg ha-1 recorded the highest grain yield (7882.8 kg ha-1) in the autumn season. Spraying of zinc significantly affected the height of the plant, leaf area index, number of grains in ear, weight of 500 grains, and the grain yield (in the autumn season only) by using 100 mg Zn l-1, which gave 7583.4 kg ha-1. Interaction between N and Zn caused significant differences in some parameters. The highest grain yield obtained attained (6425.2 kg ha-1) by using 150 kg N ha-1 +100 mg Zn l-1 in the spring season, while the interaction (200 kg N ha-1 + 100 mg Zn l-1) gave the highest grain yield in the autumn season (8867.5 kg ha-1). [ABSTRACT FROM AUTHOR] |
