Effects of Nitrification Inhibitors on Nitrous Oxide Emissions, Main Crop Yield and Nitrogen Use Efficiency in Cropland in China: A Meta-analysis

doi:10.11924/j.issn.1000-6850.casb2024-0293

Abstract

Abstract:

Excessive or irrational application of nitrogen (N) fertilizer not only increases N losses, decreases N use efficiency (NUE) and affect yield improvement in cropland, but also causes some environmental problems. Nitrification inhibitors (NIs) can reduce N losses and improve NUE through inhibiting nitrification process. Although numerous studies about NIs focused on the reduction of nitrous oxide (N₂O) emissions and promotion of yield in cropland in China, systematic analysis was still poor. In this paper, meta-analysis was used to study the effects of N fertilizer combined with NIs on the reduction of N₂O emissions, major crop yield and NUE in cropland in China, so as to clarify the influences of soil pH, N application amounts and crop types on effects of NIs. The results showed that N fertilizer combined with NIs reduced the N₂O emissions effect from cropland by 38.66% significantly (P<0.05), increase the effect of major crop yield by 7.31% (P>0.05), and enhance the effect of crop N uptake and NUE by 10.97% (P>0.05) and 25.64% (P>0.05), respectively. Among the different types of NIs, DMPP reduced the effect of N₂O emissions to maximum extent (57.30%), followed by CP and DCD, which reduced the effect of N₂O emissions by 35.07% and 32.28%. CP enhanced the effect of yield to maximum extent (12.76%), followed by DCD (5.65%) and DMPP (4.25%). The reduction size of NIs on N₂O emissions in high N input cropland (≥300 kg/hm²) was greater than that in medium and low N input cropland (<300 kg/hm²). The increasing effect of NIs on yield of main crops in medium N input cropland (200-300 kg/hm²) was greater than that in high and low N input cropland. The effects of NIs on reducing N₂O emissions and increasing crop yield in neutral soil were greater than those in acidic and alkaline soil. Principal component analysis (PCA) showed that soil pH was the main factor affecting crop yield and N₂O emission under the condition of N fertilizer applied with NIs. To sum up, N fertilizer combined with NIs could reduce N₂O emissions significantly, increase crop yield, improve N uptake and NUE to a certain extent, which was an effective path to decrease N losses and promote N utilization.

Key words: nitrification inhibitor, N₂O emission, crop yield, nitrogen use efficiency, nitrogen uptake

KANG Lixia, LUO Weigui, HOU Zhen'an, MIN Wei, LIU Tao. Effects of Nitrification Inhibitors on Nitrous Oxide Emissions, Main Crop Yield and Nitrogen Use Efficiency in Cropland in China: A Meta-analysis[J]. Chinese Agricultural Science Bulletin, 2024, 40(32): 107-115.

Figures/Tables 4

References 71

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