title: [Soil biological activities at maize seedling stage under application of slow/controlled release nitrogen fertilizers].
abstract: With pot experiment and simulating field ecological environment, this paper studied the effects of different slow/ controlled release N fertilizers on the soil nitrate - reductase and urease activities and microbial biomass C and N at maize seedling stage. The results showed that granular urea amended with dicyandiamide (DCD) and N-(n-bultyl) thiophosphoric triamide (NBPT) induced the highest soil nitrate-reductase activity, granular urea brought about the highest soil urease activity and microbial biomass C and N, while starch acetate (SA)-coated granular urea, SA-coated granular urea amended with DCD, methyl methacrylate (MMA) -coated granular urea amended with DCD, and no N fertilization gave a higher soil urease activity. Soil microbial C and N had a similar variation trend after applying various kinds of test slow/controlled release N fertilizers, and were the lowest after applying SA-coated granular urea amended with DCD and NBPT. Coated granular urea amended with inhibitors had a stronger effect on soil biological activities than coated granular urea, and MMA-coating had a better effect than SA-coating.
authors.affiliation: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. lidp1964@sohu.com
authors.forename: Dongpo
authors.initials: D
authors.lastname: Li
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Wu
authors.forename: Lijun
authors.initials: L
authors.lastname: Chen
authors.forename: Chenghua
authors.initials: C
authors.lastname: Liang
authors.forename: Lili
authors.initials: L
authors.lastname: Zhang
authors.forename: Weicheng
authors.initials: W
authors.lastname: Wang
authors.forename: Defu
authors.initials: D
authors.lastname: Yang
mesh_terms: D005308:Fertilizers; D009566:Nitrates / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D010088:Oxidoreductases / Q000378:metabolism; D036226:Seedlings / Q000254:growth & development*; D012987:Soil / Q000032:analysis*; D014508:Urea / Q000032:analysis*; D014510:Urease / Q000378:metabolism; D003313:Zea mays / Q000254:growth & development*
chemical_list: D005308:Fertilizers; D009566:Nitrates; D012987:Soil; D014508:Urea; D010088:Oxidoreductases; D014510:Urease; D009584:Nitrogen