秸秆灰直接还田对土壤的影响

Effect of Returning Straw Ash as Fertilizer to Field on Soil

本文以成都白家镇基本农田土壤作为土壤样本,分别加入比例为2.5%,5.0%,7.5%的秸秆灰,混匀后置于自然环境中,另设置对照组,每隔7 d取样,共取样6次。对土壤的部分理化性质进行测量,研究不同秸秆灰的加入量对土壤的饱和持水率、有机质、p H值、速效钾含量、速效磷含量的影响。结果表明,加入秸秆灰之后土壤的p H值明显升高,而且随着秸秆灰加入量的增加,土壤p H增加的也越多。该结论对加入秸秆灰后土壤的饱和持水率以及土壤速效磷含量的影响同样适用,然而,加入秸秆灰对土壤有机质含量的影响较小。本试验说明秸秆灰对土壤有一定的积极作用,可以提高土壤的饱和持水率、p H值、速效钾含量、速效磷含量,但对土壤有机质的含量的影响很小。

Taken the farmland soils of Chengdu Baijia village as the tested samples which added rice-straw ash with the proportion of 2. 5 %,5. 0 %,7. 5 %,separately,mixed well and left aside under the natural conditions,a control group was given,sampling every seven days,total six times. The physical and chemical properties of these samples were measured,and the effects of rice-straw ash with different addition amount on saturated water-holding capacity of soil,organic matter,p H value,the content of available potassium and the content of available phosphorus were studied. The results showed that after adding rice-straw ash,p H value increased significantly,even with the more addition of rice-straw ash,the higher the p H value increased,which also indicated that the effects of adding rice-straw ash on the saturated water-holding capacity of soil and the content of available phosphorus were the same but less on the soil organic matter content. It was concluded that recycling rice-straw ash had positive effects on soil,which could improve the saturated water-holding capacity of soil,p H value,the content of available potassium and the content of available phosphorus had little effect on the content of soil organic matter.