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为探讨沼肥培育新垦耕地地力的效果,进行了为期3年的田间小区试验,比较研究对照、低用量和高用量等3个沼肥用量水平(对照、低用量和高用量处理的沼渣年用量分别为0、15和30 t hm-2;沼液年用量分别为0、500和1000 m3 hm-2)对新垦红壤物理、化学和生物学性状的影响。结果表明,施用沼肥可明显改善新垦红壤的结构性,增加土壤有机碳、活性有机碳、全氮、有效氮、有效磷、有效钾及有效态中量和微量营养元素的含量,提高土壤微生物活性和酶活性;对土壤重金属积累的影响相对较小,所有处理土壤重金属含量均低于土壤环境质量二级标准。改良效果随沼肥用量的增加而增加。研究认为,利用沼肥改良土壤效果全面,对培育新增耕地地力是可行的。
In order to discuss the effect of biogas fertilizer on cultivated land productivity of new reclamation land, a three-year field plot experiment was carried out to compare the levels of three biogas manures (control, low dosage and high dosage treatment biogas residue The effects of 0, 15 and 30 t hm-2 annual rates on the physical, chemical and biological characteristics of the newly reclaimed red soil were studied. The annual biogas slurry volumes were 0,500 and 1,000 m3 hm-2, respectively. The results showed that the application of biogas manure could obviously improve the structure of newly cultivated red soils and increase the content of soil organic carbon, active organic carbon, total nitrogen, available nitrogen, available phosphorus, available potassium and available mesophilic and micronutrients, Microbial activity and enzyme activity. The effect on soil heavy metal accumulation was relatively small, and the contents of heavy metals in all treatments were lower than the secondary standard of soil environmental quality. The improvement effect increases with the increase of the amount of biogas fertilizer. According to the research, using biogas fertilizer to improve the soil effect is feasible and feasible to cultivate newly-added cultivated land.