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Characterization of vegetable nitrogen uptake and soil nitrogen transformation in response to continuous molybdenum application
Author(s) -
Wen Xin,
Hu Chengxiao,
Sun Xuecheng,
Zhao Xiaohu,
Tan Qiling,
Liu Peijie,
Xin Juan,
Qin Shiyu,
Wang Pengcheng
Publication year - 2018
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.201700556
Subject(s) - nitrification , chemistry , denitrification , nitrite reductase , nitrate reductase , agronomy , nitrite , nitrogen , nitrogen cycle , nitrate , fertilizer , zoology , environmental chemistry , biology , organic chemistry
Molybdenum (Mo), a plant micronutrient, is involved in nitrogen (N) cycling of global ecosystem, but little is known about its effect on soil N transformation especially the key processes nitrification and denitrification. A long‐term field experiment was carried out to investigate the effects of continuous sufficient soil available Mo on vegetable N uptake and soil N transformation. The experiment consisted of three treatments: control (CK), Mo deficiency (NPK), and Mo application (NPK+Mo). The results show that (1) after a 7‐year‐experiment, continuous Mo application significantly increased soil available Mo content. (2) Compared to the NPK treatment, NPK+Mo treatment showed an increase of 11, 18, and 8% in the cumulative crop yield, plant N uptake, and N fertilizer use efficiency. (3) With continuous Mo application, the soilNO 3-- N ,NH 4+- N , microbial biomass N, and total N contents were reduced by 14, 29, 40, and 12%, the soil nitrate reductase (NR) and nitrite reductase (NiR) activities were reduced by 14 and 8%, as well as the potential denitrification activity (PDA) and gross nitrification rate (GNR) were decreased by 64 and 80%, respectively. Additionally, continuous Mo application decreased the abundance of ammonia‐oxidizing archaea (AOA) and increased the abundance of narG ‐containing denitrifiers ( narG ) and nirK ‐type nitrite reducers ( nirK ) significantly. The data suggest that a deficiency in soil available Mo may induce the risk of soil N accumulation and environmental N emission in vegetable soil, whereas continuous Mo application could mitigate this risk by increasing crop yield and N uptake and, by decreasing soil N residues, soil nitrification and denitrification.