Volume 30, Issue 3 (2026)
J Water Soil Sci. 2026, 30(3): 1-12 |
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Pourazizi M, Fallah S. Effects of Different Fertilization Systems on Nitrogen Mineralization and Dry Matter Yield in Sorghum Cultivation in Sandy Loam Soil. J Water Soil Sci. 2026; 30 (3) :1-12
URL: http://jstnar.iut.ac.ir/article-1-4545-en.html
URL: http://jstnar.iut.ac.ir/article-1-4545-en.html
Department of Agronomy, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran. , fallah-s@sku.ac.ir
Abstract: (35 Views)
This study evaluated the impact of four fertilization systems—no fertilizer, urea-based chemical fertilizer, cow manure, and combined urea and cow manure—on nitrogen mineralization and dry matter yield in sorghum cultivated on sandy loam soil with low fertility. Nitrogen mineralization potential (N₀) was assessed using a first-order kinetic model across various fertilizer treatments. Results indicated that urea-based treatments exhibited superior nitrogen mineralization potential compared to cow manure and combined treatments, with N₀ values ranging from 13.46 to 17.89 mg N/kg soil. Combined fertilization (urea + cow manure) consistently produced higher N₀k values, suggesting enhanced nitrogen availability and mineralization rates. Correspondence between nitrogen mineralization peaks and critical sorghum growth stages was observed, particularly during vegetative and reproductive phases. The highest dry matter yield was achieved with 240 kg N/ha from combined fertilizer, although 160 kg N/ha from the same source yielded comparably. These findings highlight the synergistic benefits of integrating organic and inorganic fertilizers to optimize nitrogen dynamics and crop productivity in low-fertility soils.
Keywords: Urea, Crop productivity, Nitrogen mineralization potential, Nitrogen dynamic, Animal manure
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