| Abstrakt: |
A field experiment was conducted in Al-Muthanna Governorate on the banks of the Al-Suwer River in Iraq in the spring of 2017. The objective of this study was to know the effect of adding humic and fulvic fertilizers and zinc sulfate fertilizers on the availability of zinc and phosphorous in the soil and plants and the yield of maize crops. Four treatments of humic and fulvic fertilizers were used: Without adding acid (H0), spraying at a concentration of 10 mL/L after 40 and 80 days of planting (H1), soaking the seeds at a concentration of 20 mL/L24 h before planting (H2), and soaking seeds at a concentration of 20 mL/Lplus spraying at a concentration of 10 mL/L(H3). Furthermore, three levels of zinc sulfate fertilizer were used after 40 and 80 days of planting: 0 mL/L (Z0), 30 mL/L (Z1), and 60 mL/L (Z2). The experimental design of this study was a Randomized Complete Block Design (RCBD) with three replicates/treatments. Soil and plant samples were collected at the end of the experiment. The results showed the superiority of the treatments H3Z2 and H3Z1, suggesting the dependence on the availability of zinc and phosphorus in the soil that impacted its content in the plant, dry matter, and grain weight. The H3Z2 and H3Z1 treatments achieved 0.683 and 0.678 mg Zn/kg soil and 0.241 and 0.230 kg Zn/ha and 26.25, 24.02 mg P/kg soil and 22.49 and 21.51 kg P/ha and 10.19 and 9.75 mg Mg/kg soil, and 7.712 and 7.632 kg Mg/ha, respectively. [ABSTRACT FROM AUTHOR] |
