膨润土/废菌糠复合剂保水保肥性能研究与评价

Study and Valuation on Capability of Moisture and Fertilizer Conservation of Bentonite/Waste Auricularia-bran Composite

本研究以膨润土和食用菌栽培的废弃物木耳菌糠为原料,将二者进行不同比例混合制得膨润土/废菌糠复合剂。研究结果表明:菌糠中添加膨润土能够降低菌糠交换性酸含量,菌糠的pH值<5.5,加入膨润土后pH值提高至6.5以上,有利于作物生长;保水性能和复合剂混合比有关,即复合剂(膨润土∶木耳菌糠,质量比,下同)1∶2>1∶4>1∶6>1∶8>原木耳菌糠>黑土,膨润土的加入增强了菌糠保水性能;对NH4+吸附性能力也与复合剂的混合比有关,即1∶2>1∶4>1∶6>1∶8>黑土>木耳菌糠,膨润土的加入有效降低了木耳菌糠NH4+的流失。

In this experiment, using the bentonite and waste aricularia-bran as raw materials, the composite was prepared in different mixing ratio of betonite to waste auricularia-bran. The results show that： mixing the betonies into the waste auricularia-bran can reduce the content of exchangeable acid , the original pH value of auricularia-bran is less than 5.5, after mixing bentonite, the pH value raises to higher than 6.5, which is advantage to the growth of crops; The capability of moisture conservation is related to the mixing ratio of bontonite to waste auricularia-bran, that is 1 ： 2〉 1 ： 4 〉 1 ： 6〉 1 ： 8〉original auricularia-bran〉black soil, it is obvious that the addition of bentonite increases the capability of moisture conservation ; The adsorption capacity to NH4^＋ is also related to the mixing ratio, that is 1 ： 2〉1 ： 4〉1 ： 6〉1 ： 8〉black soil〉 auricularia-bran, adding bentonite reduces the loss of NHf effectively which exists in the original auricularia-bran.