未消化生活污泥中氮磷供应特性及其环境行为

采用土柱模拟试验，比较了生活污泥和化肥在水－旱耕作制下氮磷的肥效及其对地下水的影响。结果表明，污泥氮磷生物有效性在当季虽比等量的化肥略低，但仍有较大的肥效，且较化肥后效显著，有利于后茬作物的稳健生长。种水稻施用污泥或化肥都未发现有氮磷下渗现象；旱作条件下施化肥和污泥会产生较多的硝酸盐，且极易向下层土壤移动，但污泥的影响程度远没有化肥的大。作者认为在供试条件下按作物对养分的需要来施用污泥，不会构成氮磷对地下水污染的威胁。

The availability of nitrogen and pheephorous from undigested liquid domestic sewage sludge and their behavior in envi-ronment,

One year s lysimeter experiment with soil column cultivated for rice and rye grass was conducted to compare the impact of sludge and common fertilizer(urea, superphosphate ) on crop growth and groundwater qualitv,The results showed that N and P from sludge had a pronounced reidual effect as compared to that from the fertilizer. In the oerid of rice growth,the N and P contamination in groundwater was not discovered,but NO leaching through soil profile was noticeable in period of rye grass growth due to applicatlon of sludge and fertilizer,in which the later would produce much more NO_3 than the foimer. It is concluded that the undigested liquid domestic sewage sludge could be applied to paddy soil in certain conditions and by certain amounts with no harm of N,P pollution to groundwater. On the basis of the de-mands of crop for N and P without impairing the groundvvater quality.