太湖蓝藻发酵后沼渣和沼液的肥效研究

The Research on Fertilizer Efficiency of Taihu Lake Cyanobacteria Residue

以无锡夏季蓝藻暴发期间打捞出的蓝藻发酵后的沼渣沼液为原料,研究其作为有机肥施用的肥效。设置5个盆栽试验处理:2008年发酵沼渣沼液(处理A)、2007年发酵沼渣沼液(处理B)、新鲜蓝藻(处理C)、化学肥料(处理D)及空白对照(CK),以小白菜为试验植物。结果表明,蓝藻发酵沼渣沼液处理的小白菜株高和产量均有显著提高,并且亚硝酸盐含量低于国家规定的4 mg/kg,VC含量相对于化肥处理有显著提高。施用蓝藻发酵液和新鲜蓝藻的土壤全氮、有效磷和有机质含量显著增加,土壤酸碱缓冲能力提高。施用处理A和处理C土壤C/N比下降。

The research on the eyanobacteria residue fertilizer efficiency was made by the pot experiment with the cyanobacteria residue fermented by cyanobacteria fished from Taihu Lake in summer. The pot experiment included 5 treatments ： cyanobacteria residue fermented in 2008 （treatment A）, cyanobacteria residue fermented in 2007 （treatment B）, fresh cyanobacteria （treatment C）,chemical fertilizer（ treatment D）, control treatment （CK） with pakchoi cultivar Sijiqin. The experiment indicated that the treatment with cyanobacteria residue increased plant yield and height significantly, and the Vc content of plant increased significantly, and the nitrite content was less than national standard 4 mg/kg. Total N, available P, organic material contents in the soil in the two treatments fertilized with cyanobacteria residue and fresh cyanobacteria increased significantly, and soil buffer capacity to acid and alkaili also enhanced. The soil C/N ratio of treatment A and treatment C reduced.