A Novel High Temperature Resistant and Multifunctional Nitrification Inhibitor: Synthesis, Characterization, and Application

Abstract

The industrialized nitrification inhibitors are not suitable for compound fertilizer fabrication through high tower melt granulation process due to their poor resistance to high temperature. In this paper, a novel high temperature resistant and multifunctional nitrification inhibitor (HTRMFNI) was synthesized. The HTRMFNI is a polymer product with the complex of silicic acid and 3,4-dimethylpyrazole (DMPZ) wrapped inside the polymer and the effective content of DMPZ is 0.484 wt %. The HTRMFNI presents good nitrification inhibitory performance and rapid phosphate-solubilizing ability. The decomposition temperature of HTRMFNI is ∼212 °C, satisfying the temperature requirements for the high tower melt granulation process. The fabricated compound fertilizer presents good nitrogen immobilization performance but loses the phosphate-solubilizing ability, possibly due to the damages of carboxyl functional group on the wrapping polymer by the high melting temperature. Moreover, the addition of HTRMFNI did not affect the physicochemical properties and the overall performance of the compound fertilizer.

Synthesizing a Water-Soluble Polymeric Nitrification Inhibitor with Novel Soil-Loosening Ability

“…By introducing a copolymer structure with a strong flocculation capacity, the polymeric nitrification inhibitor is further endowed with soil-loosening function, which can increase the porosity of soil to improve the soil environment. Compared with other reported nitrification inhibitors [11][12][13][14]19,20], our NI possesses additional functions without the reduction in nitrification inhibition efficiency. This paper provides a new idea and method to improve the high temperature resistance of NI and to endow NI with multifunctionality.…”

“…Even after complexing with phosphoric acid, these shortcomings have not been effectively improved, limiting NIs’ application in some production processes that require high-temperature treatment [ 12 , 13 , 14 , 15 ]. Based on our earlier studies, the high temperature resistance can be improved by wrapping the NI in polymer networks, thus expanding its application in high tower melting granulation process [ 16 , 17 , 18 , 19 , 20 ]. The phosphorous-solubilizing ability can also be endowed by regulating the functional groups on the polymer networks [ 19 , 20 ].…”

“…Based on our earlier studies, the high temperature resistance can be improved by wrapping the NI in polymer networks, thus expanding its application in high tower melting granulation process [ 16 , 17 , 18 , 19 , 20 ]. The phosphorous-solubilizing ability can also be endowed by regulating the functional groups on the polymer networks [ 19 , 20 ].…”