Characteristics of nitrogen and phosphorus release from struvite coated urea and struvite combined with biochar coated urea in calcareous soil

doi:10.7523/j.issn.2095-6134.2021.01.011

Abstract

Abstract: The characteristics of nitrogen (N) and phosphorus (P) release from slow-release urea, developed based on urea (U) as fertilizer core and struvite (S) and biochar (B) as coating materials, are significant for evaluating the application of high N and low P fertilizer in agriculture system. In the present study, the hydrostatic test and soil column intermittent leaching experiment including five treatments (CK, U, S coated urea (USR), S+low proportion of B coated urea (USB1R), S+high proportion of B coated urea (USB2R)) were carried out to investigate the N and P release from individual S coated U and S combined with B coated U in calcareous soil based on analysis of TN, TP, NH₄⁺-N, NO₃^--N, and PO₄^3-. The results showed that release rate of N in slow-release fertilizers based on hydrostatic test was not higher than 15% within 24 h and 80% within 28 d, which meets the standards of the slow-release fertilizer (GB/T 23348—2009). The release rates of N and P in the three slow-release fertilizers swiftly increased in soil for the first 7 days, and then gradually decreased. The release rates of P in the three slow-release fertilizers were in the decreasing order: USB1R (50.9%) > USB2R (38.3%) > USR (10.0%), and the release rates of N were in the order: USB2R (86.2%) > USB1R (83.1%) > USR (74.0%). The release rates of N in slow-release fertilizers were lower by 9-21 percentages than that in urea. The individual S coated urea and S combined with B coated urea showed slow release of N and P in calcareous soil. The actual efficacy of the developed slow-release fertilizers needs to be further verified.

Key words: stuvite, biochar, slow-release fertilizer, nitrogen, phosphorus, nutrient release, calcareous soil

CLC Number:

X703

TANG Sichen, YANG Xiaosong, ZHANG Wantong, MU Jing, XIE Zijian, WANG Jinzhi, HU Zhengyi. Characteristics of nitrogen and phosphorus release from struvite coated urea and struvite combined with biochar coated urea in calcareous soil[J]. Journal of University of Chinese Academy of Sciences, 2021, 38(1): 83-93.

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