| Stability of gel\|based water\|absorbent slow\|release urea |
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| DOI：10.7606/j.issn.1000-7601.2021.04.18 |
| Key Words: gel\|based water\|absorbent slow\|release urea stability urea/SAP ratio UV\|aging water absorbency |
| Author Name | Affiliation | | HE Xusheng | College of Environment and Resources, Northwest A & F University, Yangling, Shaanxi 712100, China | | XU Shiyan | Fruit Industry Research & Development Center of Shaanxi Province, Xi'an, Shaanxi 710018, China | | WAN Tian | Horticulture College, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The stability of the functional controlled\|release materials used to slow/controlled\|release fertilizer is very important to maintain its function of controlled\|release material in soils during a long period of time. In this article, a gel\|based water\|absorbent slow\|release urea fertilizer (WASRNF) was prepared by co\|polymerization with SAP（Super Absorbent Polymer）and urea (U). The stability of WASRNF was evaluated by DSC\|TGA, soil incubation, ultraviolet aging (UV\|aging), IR, ESEM and water\|absorbency. The thermal analysis results indicated that thermal stability of WASRNF was related to ratio of U/SAP in WASRNF, the better ratio was 0.54∶1 and 0.44∶1. The water\|absorbency indicated that the SAP still had the capability of water\|absorbing and water\|holding after the urea was released from WASRNF incubated in soils. The analysis of IR and ESEM results also showed that soil nutrients and salts had been adsorbed onto WASRNF after release of urea from WASRNF. The experiment results of UV\|aging showed that the morphology and color of WASRNF had changed, however, their IR indicated that the chemical structure of WASRNF had not changed. Thus, the WASRNF still had function of water\|absorbing and water\|holding and nutrient slow\|release. Therefore, the laboratory\|made WASRNF was a water\|absorbing and water\|holding slow/controlled release nitrogenous fertilizer with certain stability. The better ratio of U/SAP in WASRNF was 0.54∶1 and 0.44∶1. |
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