Impacts of potassium humate and manganese on nutrients uptake and maize yield at two irrigation water levels | ||
| Aswan Journal of Agricultural and Biological Sciences | ||
| Articles in Press, Accepted Manuscript, Available Online from 05 November 2025 | ||
| Document Type: Research article | ||
| DOI: 10.21608/ajabs.2025.410147.1023 | ||
| Authors | ||
| Madiha M. A. Mahmoud* 1; Kassem A. S. Mohammed1; Ayman M. S. Elshamly2 | ||
| 1Institute of African Research and Nile Basin Countries Research and Studies, Aswan University, Aswan, Egypt. | ||
| 2National Water Research Center, Cairo, Egypt. | ||
| Abstract | ||
| Effective fertigation management is crucial for maximizing maize yield and irrigation water use efficiency, particularly in arid regions. This involves understanding how different irrigation conditions affect crop response to nutrient application and optimizing fertilizer and water use efficiency for optimal growth and yield. The current study evaluated the effectiveness of potassium humate and chelated manganese in both single and combined applications on maize nutrient uptake, grain production, and irrigation water use efficiency across two irrigation levels. A split-plot experiment was conducted, whereas two irrigation requirements of maize (Ir) levels (100% and 70%) were designated for main plots. While in the subplots featured maize plants treated with either tap water (control), potassium humate at a rate of 15 Kg ha-1, chelated manganese at rates of 0.5%, and combined applications of potassium humate + chelated manganese. Based on the results, compared to a 100% Ir level, applying potassium humate chelated manganese under 70% Ir resulted in increased levels of K and Zn by 15.0% and 24.0%, respectively. Simultaneously, nitrogen (N) and iron (Fe) levels decreased by 9.6% and 5.1%. Overall, the study suggests that combining a 70% irrigation level with soil application of potassium humate and foliar-applied chelated manganese can significantly improve maize yield and water use efficiency under water-stressed conditions. This approach helps plants mitigate the negative impacts of water deficiency. | ||
| Keywords | ||
| Keywords: Maize; Fertilization management; Water deficit | ||
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