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不同配比浓度的污泥对土壤保水性及有效养分有着不同程度的影响。污泥能提高基质的保水能力,延长植物的萎蔫时间,当添加浓度为60.5%时,达到最大值238h。栽培基质中速效氮、磷、钾含量随着污泥添加浓度增大而增大。当污泥施用浓度为80%时,种植植物的系列中,速效氮、磷、钾的含量分别达到:296.76mg/kg、199.45mg/kg、246.24mg/kg。因此,添加污泥能使栽培基质的保水能力和有效养分含量提高,为植物生长创造良好的条件。
Different concentrations of sludge have different degrees of impact on soil water retention and available nutrients. Sludge can increase the water holding capacity of the substrate and prolong the wilting time of the plant, reaching a maximum value of 238 h when the added concentration is 60.5%. The contents of available N, P and K in the cultivation medium increased with the increase of sludge concentration. When the concentration of sludge was 80%, the contents of available nitrogen, phosphorus and potassium in the planted plants reached 296.76mg / kg, 199.45mg / kg and 246.24mg / kg, respectively. Therefore, the addition of sludge can increase the water holding capacity and effective nutrient content of the culture substrate and create good conditions for plant growth.