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| DOI：10.13522/j.cnki.ggps.2025300 |
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| Development and evaluation of a solid fertilizer addition-dissolution- application system for precision fertigation |
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ZHANG Zhiyang, LI Yang, GAO Juling, HUANG Feng
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1. School of Mechanical and Electrical Engineering of Jiangsu Vocational College of Agriculture and Forestry, Jurong 212400, China;
2. School of Mechanical Engineering of Jiangsu University of Technology, Changzhou 213001, China;
3. Jiangsu Modern Agricultural Equipment and Engineering Center, Jurong 212400, China;
4. Nanjing Wotian Intelligent Technology Company Limited, Nanjing 210046, China
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| Abstract: |
| 【Objective】Efficient fertigation of solid fertilizers is often constrained by rapid concentration attenuation and the difficulty of precise controlling fertilizer solution concentration in traditional equipment, reducing nutrient use efficiency. We developed and evaluated a novel fertigation system to address these issues and to increase effective application of solid fertilizers in fertigation.【Method】The system was developed based on theoretical analysis and experimental verification. A model describing the dynamics of fertilizer solution concentration in a fertilizer-mixing barrel was proposed based on mass balance theory and the Hixson-Crowell dissolution kinetics. A solid fertilizer addition-dissolution-application (ADA) fertigation prototype was then developed. The accuracy of the model and the performance of the prototype were verified through indoor and outdoor experiments.【Result】①The dynamic concentration change predicted by the model agreed well with experimental data, with an average error of 9.67%. A simplified version of the model remained accurate, with an average error of 10.08%. ②The effluent concentration of the prototype was stable. In field application, fertilizer solution concentration at the sprinkler nozzle was uniform and maintained at approximately 1.66 g/L. ③Both model analysis and experimental verification indicated that adjusting the ratio of fertilizer application flow rate to water supply flow rate enabled precise control of fertilizer solution concentration.【Conclusion】The constructed dynamic model for solid fertilizer dissolution kinetics was accurate and effectively captured the dynamic balance between fertilizer addition and dissolution. The prototype demonstrated good fertilization uniformity. Further improvements should consider the influence of other environmental factors such as ambient temperature and water flow turbulence on solid fertilizer dissolution. |
| Key words: fertigation; solid fertilizer; concentration regulation; dissolution mechanism |
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