改良剂结合羽毛发酵液施用对吹填土的改良效果

Improvement of dredger fill soil by ameliorant combined with feather fermentation broth

吹填土由于含盐量高、黏重板结、通气透水差和脱盐率低等特性,严重限制了其绿化能力。选取稻壳和蛭石为物理改良剂,研究不同配比的改良剂对吹填土脱盐效果和性质的影响。土柱实验结果表明:与未掺拌改良剂的对照组(CK)相比,掺拌改良剂能有效提高脱盐效果。其中,以质量分数4%稻壳和4%蛭石配比最佳,洗盐效率为88􀆰75%,改良后土壤容重降低了30%,有效磷含量提高了18%,有效钾含量提高了12%。利用最佳改良后的土壤进行了小白菜盆栽种植,结果表明:与利用羽毛发酵液(羽毛降解菌发酵制得)联合作用效果最佳,小白菜株高提高了41􀆰11%,鲜重提高了283􀆰78%。由此可知,以来源于低劣固体废弃物的改良剂进行吹填土洗盐处理,并配施一定量的羽毛降解发酵液,可提高吹填土的可植性及肥效。

Dredger fill has severely restricted its greening ability due to its high salt content,heavy compaction,poor ventilation,water permeability and low salt rejection rate.In our experiment,rice husk and vermiculite were selected as physical modifiers,and the effects of modifiers with different proportions on the desalination effect and properties of dredger fill were studied.The results of the soil column experiment show that:compared with the control group without mixed modifier,the mixed modifier can effectively improve the desalination effect.Among them,the ratio of 4%rice husk and 4%vermiculite is the best,the salt washing efficiency is 88􀆰75%,the soil bulk density after the improvement is reduced by 30%,the effective P content is increased by 18%,and the effective K is increased by 12%.The best improved soil was used for pot planting of Chinese cabbage.The results showed that the combined effect of using feather fermentation broth(produced by feather degrading bacteria)was the best.Plant height of Chinese cabbage increased by 41􀆰11%,fresh weight increased by 283􀆰78%.Therefore,the dredger fill soil washing salt treatment with the improver derived from inferior solid waste and a certain amount of feather fermentation broth can improve the plant ability and fertilizer efficiency of the dredger fill soil.