Effect of applying Hong Kong Biosolids and Lime on nutrient availavbility and plant Growth in an acidic loamy soil

摘要

A greenhouse experiment was conducted to evaluate the growth of Brassica chinensis L. In an acidic loamy soil amended with municipal biosolids with or without lime treatment(750 mg kg~-1). The soil was amended with one of two municipal biosolids from Tai Po(TP) or Yuen Long (YL) wastewater treatment plants at application rates of 0,5,10,25 and 50/100(v/v). Initial NH~+_4-N and PO_4~3-P concentrations in the amended soil increased with an increase in municipal biosolids loading rates and Those with biosolids from TP had a greater increase in nutrients than those from YL. However, initial NO_3-N contents in Both municipal biosolids amended soils decreased with an increase in biosolids loading rates, particularly for the soil Amended with YL.