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Role of Organic and Mineral Fertilizers in the Availability of Molybdenum in the Rhizosphere and Beyond of Maize

Raaid Al-Zubaidy Raaid Riyadh, Jarallah Raid Shaalan

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 9

92--98

Molybdenum plays an important role as a nutrient for plants. It has an important role in the process of plant growth and fixing nitrogen for the plant. A field experiment conducted in the autumn of 2023 aimed to study how different fertilizer treatments affected the availability of molybdenum in maize (Zea mays L.) rhizosphere and nonrhizosphere soils. The treatments included sheep manure at a rate of 8 tons per hectare, urea at 400 kg per hectare, humic acid at 500 cm3 per liter per dunum, and a control group. The experiment followed a randomized complete block design (RCBD) with three replications, using local maize seeds planted in 3 m by 3 m plots. After applying the treatments, the concentration of available molybdenum was measured in both soil regions at 70 and 100 days after planting. Results indicated that adding fertilizers (sheep manure, humic acid, and nitrogen) increased the concentration of available molybdenum in both soil regions. Specifically, the humic acid treatment had the highest concentration of available molybdenum at both 70 and 100 days, while the nitrogen treatment had the lowest. This highlights the importance of humic acid and organic materials in improving molybdenum availability. Furthermore, molybdenum concentration increased at the 100-day mark for all treatments outside the rhizosphere, except for the control, showing that all treatments enhanced molybdenum content both within and beyond the rhizosphere.