Abstract
The present field trial aimed to study the effect of fertilizer type and growth duration on copper availability in the maize soil. In addition to the control, six different fertilizer treatments of mineral fertilizers, organic fertilizers, and humic acid (two levels each) were applied in the experiment. Soil samples were collected 70 and 100 days after planting. The results present that there were no significant differences between the half-recommendation fertilizer treatments (the first level) for all fertilizers, and the effect of the entire recommendation treatments (the second level) for poultry waste and humic acid 0.37 mg kg-1 and their superiority over the urea fertilization treatments 0.33 mg kg-1 in 70 days of cultivation. At 100 days, the fertilization treatments with poultry waste resulted in the highest concentration of available copper, 0.41 and 0.35 mg kg-1, respectively, the two levels. The results present a decrease in the concentration of available copper in the soil with an increase in the growth period.
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