浅谈污泥对栽培基质保水性和有效养分的影响

Impact on Water Retaining Capacity and Effective Nutrients of Sludge

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。

In this article, soil of reclamation area in Shendong Majiata open pit mining was the study object, sludge was mixed separately with soil in ratio of 0%, 20%, 40%, 60%, 80% to get new cultural substrates, using pot experiments to study on the growth of yellow horn （Xanthoceras sorbifolia Bge.）, analysis of the water retaining capacity and the impact of effective nutrients on different mixing concentration of sludge. The results showed that： Sludge can improve the water retaining capacity; extend the time of plants wilting point, the maximum value up to 238h when the addition is 60.5 percent, sludge can obviously increase the wilting point of the cultural substrates, as well as the content of available nitrogen, phosphorus and potassium, and increased with the amount of adding sludge. When the concentration of sludge application up to 80% Cultivation of plants in the series, available nitrogen, phosphorus and potassium content, respectively： 296.76 mg/ kg, 199.45 mg/kg, 246.24 mg/kg.Therefore, adding sludge can greatly increase the water retaining capacity and content of effective nutrients, and create good conditions for plant growing.