文献类型： 外文期刊

作者： Maitlo, Ali Akbar ¹ ; Zhang, Shuiqing ³ ; Ahmed, Waqas ⁴ ; Jangid, Kamlesh ⁵ ; Ali, Sehrish ¹ ; Yang, Hongbo ¹ ; Bhatti, Saleem Maseeh ⁷ ; Duan, Yinghua ¹ ; Xu, Minggang ¹ ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Arable Land Qual Monitoring & Evaluat, Minist Agr & Rural Affairs, Beijing 100081, Peoples R China

2.Govt Sindh, Soil Fertil Res Inst, Agr Res, Tandojam 70060, Pakistan

3.Henan Acad Agr Sci, Inst Plant Nutr & Environm Resources Sci, Zhengzhou 450002, Peoples R China

4.Hainan Univ, Coll Ecol & Environm, Haikou 570100, Hainan, Peoples R China

5.SP Pune Univ, Natl Ctr Microbial Resource, NCCS, Pune 411007, Maharashtra, India

6.Univ Toronto Mississauga, Dept Biol, Evolutionary Ecol Lab, Toronto, ON L5L 1C6, Canada

7.Sindh Agr Univ, Dept Soil Sci, Tandojam 70060, Pakistan

关键词： aerobic incubation; manure application; mineralization rate; NH4+ fixation; nitrification rate; nitrogen mineralization potential

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2022 年 12 卷 6 期

页码：

收录情况： SCI

摘要： The determination of organic nitrogen (N) mineralization is crucial for estimating N availability, quantifying exogenous inputs, and estimating associated environmental impacts. The objective of this study was to explore the effect of long-term various fertilization on soil organic N mineralization potential (NMP), which influences plant N accessibility. Treatments from a 26-year long-term field experiment with no fertilization (CK), chemical fertilizer N at 165 kg N ha(-1) and P at 82.5 kg P2O5 ha(-1) (NP), NP with K fertilizer at 165, 82.5, 82.5 kg ha(-1) N, P2O5 and K2O (NPK), NPK at 165, 82.5, 82.5 kg ha(-1) N, P2O5 and K2O with manure at 7857.14 kg ha(-1) (NPKM), and NPKM at 165, 82.5, 82.5 kg ha(-1) N, P2O5 and K2O with manure at 1.5x application rate (11,785.71 kg ha(-1)) (1.5NPKM) were examined for potentially mineralizable N by aerobic incubation at 35 degrees C for 30 weeks. Three pools (Pools I, II, and III) of mineralizable N were recognized. Pool I, the mineralization flush on rewetting in the first 2 weeks; Pool II, gross N mineralization between weeks 2 and 30; and Pool III, the potentially mineralizable N, predicted from the fitted curve, that did not mineralize during the incubation period. Soil microbial biomass carbon (SMBC) and N (SMBN) as well as fixed ammonium (NH4+) contents and relationship with N mineralization rate (k) were also studied. Long-term manure application yielded a significantly higher k (0.32 week(-1)) than other treatments (0.12-0.22 week(-1)) but not a significantly higher NMP. Nitrogen mineralization during the wheat and maize-growing seasons was predicted to be 8.7-26.3 (mg N kg(-1) soil) and 25.9-42.1 (mg N kg(-1) soil), respectively. Both labile mineralizable N pools (Pools I and II) followed the same patterns in the treatments: 1.5NPKM > NPKM > NPK > NP > CK, while the reverse was true for stable N (Pool III). The significant positive correlation between k with SMBC and SMBN (R-2 = 0.93, p = 0.008 and R-2 = 0.94, p = 0.006) suggested that the higher mineralization rate might be contributed by the higher soil microbial biomass in NPKM. The trends of fixed NH4+ and mineralized N were coupled. Long-term manure application significantly improved the N mineralization rate in soil. Manure application is an effective strategy to enhance soil microbial biomass and soil N availability and has the potential to reduce the dependence upon chemical N fertilization.