A novel amended nitrification inhibitor confers an enhanced suppression role in the nitrification of ammonium in soil

Abstract

Purpose Nitrification inhibitor plays an important regulatory role in inhibiting the nitrification of ammonium in soils. However, most of nitrification inhibitors lack the sustainable effects in suppressing the nitrification of ammonium. In this study, a novel DMS nitrification inhibitor was prepared and tested to explore its lasting effect of nitrification suppression in black soil. Materials and methods Both culture experiments and field trial were performed in black soils. Three kinds of nitrification inhibitors (NIs), dicyandiamide (DCD) with low bioactivity, 3,4-dimethylpyrazole phosphate (DMPP) with high bioactivity, and a novel 3,4-dimethylpyrazole sulfate zinc (DMS) with long half-life, were applied into soils, respectively, and the abundance changes of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) were investigated; then, the accumulation changes of inorganic nitrogen, nitrogen use efficiency, and crop yields were furtherly evaluated. Results and discussions A novel DMS nitrification inhibitor with high activity and long half-life maintained a persistent effect of nitrification suppression, and remarkably increased the accumulation of ammonium nitrogen in soil, thus improving nitrogen use efficiency and crop yields. This study implies that lowering the nitrogen loss of nitrification-triggered in soil is of great importance for improving nitrogen use efficiency. Conclusions This study provided an insight into the sustainable nitrification suppression of a novel DMS nitrification inhibitor under excessive application of nitrogen fertilizer in black soils. Compared with improving the activity, reasonably prolonging the validity of nitrification inhibitors in soil is a more important strategy increasing the sustainable effects of nitrification inhibition, and the survival period of nitrification inhibitors in soil should be a crucial factor improving nitrogen use efficiency.

Effects of neem leaf extract on inorganic nitrogen transformation in sandy soil

“…The long-lasting and high NH 4 + -N concentrations in the soil, attributed to the inhibitory effects of neem leaf extract (Fig. 1A), may become toxic to the plant (Guo et al, 2022).…”

Rapid and Inexpensive Assay for Testing the Efficiency of Potential New Synthetic Nitrification Inhibitors

“…NUEs can be increased by using fertilizers amended with nitrification inhibitors (NIs). , These additives inhibit nitrifying microorganisms in the soil, such as ammonia oxidizing bacteria (AOB), that are responsible for the conversion of NH 3 to NO 3 – via hydroxylamine (NH 2 OH), nitric oxide (NO), and nitrite (NO 2 – ), thereby increasing the residence time of ammonium (NH 4 + ) and reducing undesired N losses. − AOB are ubiquitous, and NIs are designed to target ammonia monooxygenase (AMO), , the key enzyme in the nitrification process, which is responsible for the initial (and rate determining) transformation NH 3 → NH 2 OH …”