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Chinese Journal of Applied Ecology ›› 2002, Vol. ›› Issue (11): 1417-1420.

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ZHANG Xiaoxiao, SHEN Qirong, TAN Jiankang, MAO Zesheng   

  1. Resource and Environment Science College, Nanjing Agricultural University, Nanjing 210095
  • Received:2001-01-12 Revised:2001-04-16

Abstract: Incubation test and pot experiments were conducted with haplic luvisols and hydragric anthrosols to study the effects of neem seed extracts (NⅠ, NⅡ) on nitrification and immobilization of ammonium sulfate. NⅠ could significantly inhibit the nitrification of Napplied to the two soils. NⅡ was effective in promoting the immobilization of NH4+-N. Pot experiments showed that NⅡ could increase the use efficiency of chemical nitrogen significantly in fimic anthrosols.

Key words: biomass conversion and expansion factors., Cubist model, random forest, boosted regression trees, national forest inventory

CLC Number: