[Soil biological activities at maize seedling stage under application of slow/controlled release nitrogen fertilizers].
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.
Li
Dongpo
D
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. lidp1964@sohu.com
Wu
Zhijie
Z
Chen
Lijun
L
Liang
Chenghua
C
Zhang
Lili
L
Wang
Weicheng
W
Yang
Defu
D
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*
D005308:Fertilizers; D009566:Nitrates; D012987:Soil; D014508:Urea; D010088:Oxidoreductases; D014510:Urease; D009584:Nitrogen