Document Type : Research Paper
Authors
1
PhD Student, Department of Soil Science, College of Agriculture, Shahid Chamran University of Ahvaz,Iran
2
Professor, Department of Soil Science, College of Agriculture, Shahid Chamran University of Ahvaz,Iran.
3
Associate Professor, Department of chemistry, College of Science, Shahid Chamran University of Ahvaz,Iran.
10.22092/ijsr.2025.368881.772
Abstract
Salinity stress is one of the stresses that disrupts the absorption of water and nutrients by plants. Therefore, in order to use saline and sodic soils and provide the nutrients needed by plants, the use of slow-release fertilizers based on hydrogel compounds can be useful in better absorption of water and nutrients. The use of new and environmentally friendly hydrogels can be a solution to soil salinity stress. First, a composite hydrogel of N-P-K fertilizers based on carboxymethyl cellulose was synthesized in the laboratory. Necessary morphological and stability tests of the synthesized hydrogel were performed, including TEM, SEM, FTIR, EDS and TGA. The release of N-P-K nutrients was investigated at different EC and pH levels over a period of 28 days. The results showed that the nutrient release curve at different pH had almost the same slope, indicating controlled release and matrix-based release. The release curve of nitrogen, phosphorus, and potassium elements and the percentage of element release from the synthesized hydrogel were consistent with the international standard definition for slow-release fertilizers. To investigate the effectiveness of fertilizers in saline soil on the growth characteristics of tomato plants and some soil properties, an experiment was conducted in a randomized complete factorial design with three replications in a greenhouse. The experiment was conducted in a completely randomized design with three replications in a greenhouse. The experiment was factorial. The factors studied included: 1) soil type at two levels (saline and non-saline) and 2) slow-release fertilizer at three levels (0, 1, and 2 percent).The results showed that the interaction effect of applied fertilizer level and soil salinity on some vegetative characteristics of tomato, percentage of nitrogen, phosphorus, and potassium in tomato plant shoots, and soil characteristics was significant at the 5 percent level. The effect of applied hydrogel caused a significant increase in the amount of organic carbon, nitrogen, phosphorus, and potassium in the soil compared to the control soil. The highest amount of nutrient absorption in tomato plants was obtained at 2% hydrogel fertilizer levels compared to the control treatment. Therefore, the plant has sufficient nutrients for growth and development at all stages of growth, which makes the use of nutrients more efficient compared to conventional fertilizers.
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