Effects of Co-application of Biochar and Nitrification Inhibitor on Soil Nitrification and N2O Emissions in Tropical Vegetable Soil

doi:10.3969/j.issn.1000-2561.2021.10.039

Abstract

Abstract:

To evaluate the effects of co-application of biochar and nitrification inhibitor on regulating soil nitrification and mitigating N₂O emission, an incubation experiment was conducted to explore the dynamic variations of inorganic N concentration and the associated intensity and N₂O emissions in tropical vegetable soil. Four treatments were established as N fertilizer alone (N), N fertilizer applied with biochar (N+Bc), N fertilizer applied with nitrification inhibitor (N+Ni), and N fertilizer applied with biochar and nitrification inhibitor (N+Bc+Ni). Results showed that biochar amendment accelerated the conversion of NH₄⁺-N to NO₃^--N, while nitrification inhibitor significantly decreased this process, and the co-application of the both weakened the nitrification to some extent. Moreover, biochar amendment elevated the NO₃^--N intensity by 15.8%, while nitrification inhibitor amendment promoted NH₄⁺-N intensity by 33.4%, and the significant interaction occurred between biochar and nitrification inhibitor on NH₄⁺-N and NO₃^--N intensity. In addition, NO₂^--N intensity was decreased by biochar or nitrification inhibitor amendment, with the latter having more obvious effects. Furthermore, biochar and nitrification inhibitor amendment alone decreased N₂O emission by 15.1%-68.3%, and further decline in N₂O emission occurred in the co-application of the both. Therefore, the co-application of biochar and nitrification inhibitor would be a promising strategy for simultaneously sequencing carbon and mitigating N₂O emission in tropical vegetable soil.

Key words: Biochar, nitrification inhibitor, nitrification, nitrous oxide (N₂O), vegetable soil

CLC Number:

ZHU Yunfei, ZHANG Qi, HUANG Yilun, LENG Youfeng, CHEN Miao, FAN Changhua, LI Qinfen. Effects of Co-application of Biochar and Nitrification Inhibitor on Soil Nitrification and N₂O Emissions in Tropical Vegetable Soil[J]. Chinese Journal of Tropical Crops, 2021, 42(10): 3042-3048.

Figures/Tables 5

Fig. 1 Dynamics of soil inorganic N concentrations during incubation period

Tab. 1 Soil inorganic N intensity of different treatment

处理 Treatment	NH₄⁺-N Intensity /(mg•d•kg^?1)	NO₂^--N Intensity /(mg•d•kg^?1)	NO₃^--N Intensity/(mg•d•kg^?1)
N	68.46±1.35^c	0.47±0.03^a	54.29±2.10^b
N+Bc	45.64±0.76^d	0.43±0.03^a	62.86±0.43^a
N+Ni	91.34±3.41^a	0.36±0.01^b	38.10±0.82^d
NI+Bc+Ni	73.71±0.88^b	0.35±0.00^b	42.18±0.46^c
Two-way ANOVA
Bc	*	n.s.	*
Ni	*	*	*
Bc×Ni	*	n.s.	*

Fig. 2 N2O production rate of different treatment during incubation period

Fig. 3 Cumulative N2O emissions of different treatment Different lowercase letters indicate significant difference (P<0.05).

Fig. 4 Linear regression analysis of cumulative N2O emissions with soil inorganic N concentrations

References 23

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Effects of Co-application of Biochar and Nitrification Inhibitor on Soil Nitrification and N₂O Emissions in Tropical Vegetable Soil

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