| Characteristics and performance of water-absorbent slow-release calcium fertilizer |
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| DOI：10.7606/j.issn.1000-7601.2017.01.13 |
| Key Words: water-absorbent calcium fertilizer chemical polymerization characteristics performance |
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| Abstract: |
| Incorporating super absorbent polymer (SAP) and calcium nitrate into one body by chemical polymerization, and then water-absorbent/-retaining capability, some chemical properties, morphology and nutrient release performance of water-absorbent calcium fertilizer (WACF) were characterized by water absorbency, soil water characteristic curve, ultimate analysis, IR, SEM and 7-day dissolution rate. The results show that the WACF has water-absorbency of approximately 165 g·g-1, 103 g·kg-1 of calcium content, nearly neutral pH. The SAP incorporated with calcium fertilizer by chemical bond and substrate occlusion. The pores of cross-linked network of WACF are space to storing water. In comparison with the check treatment, WACF can increase volumetric water content of soil by average 14.0%between tested suction when the ratio of WACF to soil is 1%wt. Also, WACF show better slow-release performance of calcium nutrient which retain calcium nutrient in hydrogel substrate much more time that increase available duration of soluble calcium. |
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