Nitrogen Release Characteristics of Slow-release Fertilizer and Its Efficiency

Abstract

Abstract: Two slow-release nitrogen fertilizers (SRF) were self-produced by coating humic acid or fused calcium- magnesium phosphate on the surface of urea granule. Indoor soil culture and pot experiment were carried out to study the nitrogen release characteristic of SRF and its efficiency，respectively. The results of soil culture experiment showed that both two SRFs had significant effect of nitrogen slow release. After 24h’s incubation， the nitrogen release percentage of urea was 56.78%，however，which of SRFs was 15.28% and 11.58%， respectively. The results of pot experiment with corn showed that, compared with urea，SRFs significantly increased the yield and nitrogen uptake of corn as well as apparent nitrogen recovery, in which the SRF2 of coating urea with humid acid performed best.

CLC Number:

S143.1

Zhao Qingbing，Xing Shangjun，Liu Chunsheng，Du Zhenyu，Liu Fangchun，Duan Chunhua，Feng Zhimin. Nitrogen Release Characteristics of Slow-release Fertilizer and Its Efficiency[J]. Chinese Agricultural Science Bulletin, 2007, 23(8): 265-265.

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Nitrogen Release Characteristics of Slow-release Fertilizer and Its Efficiency

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