Preparation and Properties of a Slow Release NP Compound Fertilizer with Superabsorbent and Moisture Preservation
writer：Mingyu Guo, Mingzhu Liu*, Zheng Hu, Falu Zhan, Lan Wu
keywords：hydrogels; swelling; slow release fertilizer; moisture preservation; gels
source：期刊
specific source：J. Appl. Polym. Sci. 2005, 96, 2132-2138.
Issue time：2005年
A slow-release NP compound fertilizer with superabsorbent and moisture preservation was prepared by carboxyl methyl starch, acrylic acid, ammonia, urea, diammonium phosphate, and so on. The effects of the amount of initiator, crosslinker, and the degree of neutralization of
acrylic acid on water absorbency were investigated and optimized. The product was characterized by FTIR, ICP, and element analysis, and the results showed that the product
contained 22.6% nitrogen element and 7.2% phosphor (shown by P2O5) element. Its water absorbency was about 85 (g g1) times its own weight in tap water. We also investigated
the water retention property of the product and the slow release behavior of N and P in the product. The results showed that the product had a good water retention capacity and slow release property. The mechanism of the release of N and P in water was also investigated.