Effect of long-term fertilization on soil aggregate-associated dissolved organic nitrogen on sloping cropland of purple soil

K.K. Hua, B. Zhu, X.G. Wang, X.S. Guo, D.Z. Wang and Z.B. Guo
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K.K. Hua: Soil and Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei, P.R. China
B. Zhu: Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, P.R. China
X.G. Wang: Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, P.R. China
X.S. Guo: Soil and Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei, P.R. China
D.Z. Wang: Soil and Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei, P.R. China
Z.B. Guo: Soil and Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei, P.R. China

Plant, Soil and Environment, 2014, vol. 60, issue 2, 51-56

Abstract: To investigate the effect of fertilization practice on dissolved organic nitrogen (DON) in aggregates, the study was conducted and involved four fertilization treatments: no fertilizer; mineral fertilizer (MF); pig manure matched with mineral fertilizer (MFP) and crop straw matched with mineral fertilizer (MFR). The results showed that DON content and storage were the highest in > 5 mm aggregates and were the lowest in < 0.25 mm aggregates. Compared with MF, MFP and MFR significantly increased DON contents in > 5 mm by 404.7% and 184.4%. In comparison with MFR, DON content and storage in > 5 mm aggregates for MFP were significantly enhanced by 77.5% and 75.0%. A significantly positive linear correlation relationship between DON content and microbial biomass carbon content was observed in aggregates (R2 = 0.84; P < 0.01). The results suggest that pig manure matched with mineral fertilizer is a preferred strategy for retaining DON nutrient due to enhanced microbial biomass in aggregates on sloping upland of purple soil.

Keywords: cropland; mineral fertilizer; manure; crop straw; microbial biomass (search for similar items in EconPapers)
Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:60:y:2014:i:2:id:881-2013-pse

DOI: 10.17221/881/2013-PSE

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