Plant Soil Environ., 2014, 60(2):51-56 | DOI: 10.17221/881/2013-PSE

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

K.K. Hua1,2, B. Zhu2, X.G. Wang2, X.S. Guo1, D.Z. Wang1, Z.B. Guo1
1 Soil and Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei, P.R. China
2 Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, P.R. China

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

Published: February 28, 2014  Show citation

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Hua KK, Zhu B, Wang XG, Guo XS, Wang DZ, Guo ZB. Effect of long-term fertilization on soil aggregate-associated dissolved organic nitrogen on sloping cropland of purple soil. Plant Soil Environ. 2014;60(2):51-56. doi: 10.17221/881/2013-PSE.
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