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- Title
抑制剂和猪粪对尿素氮在稻田土壤中转化的影响.
- Authors
于春晓; 张丽莉; 杨立杰; 李文涛; 武开阔; 解学仕; 李东坡; 武志杰
- Abstract
With the aim to understand the response of different nitrogen forms in paddy soil under the conditions of urea combined with inhibitors and pig manure, and to explore the nitrogen retention and supply capacity of paddy soil under different management strategy, we conducted a pot experiment with 15N labeled urea. There were six treatments: no nitrogen fertilizer (CK), pig manure (M), urea (N), urea+ pig manure (NM), urea+ inhibitor (NI), urea+ inhibitor+ pig manure (NIM). Urease inhibitor (PPD+NBPT) and nitrification inhibitor (DMPP) were used as the inhibitor combination. Soil nitrogen pools, conservation of 15N labeled urea, and rice N adsorption were measured in rice seedling, tillering, and mature stages. Results showed that pig manure significantly increased soil ammonium concentration, soil microbial biomass nitrogen and fixed ammonium, as well as the storage of urea nitrogen in various pools at tillering stage, and significantly increased rice yield. Addition of the inhibitors increased NH4+ fixation by clay minerals and nitrogen immobilization by microorganisms compared with treatment N, and increased urea-derived NH4+ fixation by clay minerals compared with treatment NM. pathway analysis showed that pig manure increased urea-N assimilation and yield of rice. The urea-derived ammonium fixed by clay minerals was temporarily stored after inhibitors application. NiM treatment stored more N in microbial biomass, and the released ammonium coupled the turnover and mineralization of mierohial provided more availahle nitrogen lor the later growth of rice. Both NM and NIM treatments are recommended in paddy lields of north China.
- Subjects
CHINA; NITROGEN fertilizers; UREA as fertilizer; NITRIFICATION inhibitors; CLAY minerals; MANURES; NITROGEN in soils
- Publication
Yingyong Shengtai Xuebao, 2020, Vol 31, Issue 6, p1851
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.202006.026