摘要
对新民市露地和保护地土壤有效氮、磷、钾养分现状进行了调查,对露地土壤有效磷、有效钾在28a间含量变化进行了分析。结果显示:露地土壤有效氮肥力水平较高,全市平均含量为98.96mg/kg;土壤有效磷含量递增,平均含量从1980年的4.96mg/kg上升到2008年的11.61mg/kg;土壤有效钾呈递减趋势,平均含量从1980年的128.08mg/kg下降到2008年的79.90mg/kg,平均每年降低1.90%。保护地土壤有效氮、磷、钾的含量随使用年限的增加呈上升趋势。
A detailed survey was made for soil available nitrogen, phosphorus and potassium in agricultural fields and sheltered grounds in Xinmin District, and a comparative study on the evolutionary trend of soil available P and K was made on the basis of the survey of soil nutrients in 1980. As for agricultural fields, the average content of available nitrogen was 98.96mg/kg in 2008; the average content of available soil phosphorus has increased gradually from 4.96mg/kg in 1980 to 11.61mg/kg in 2008; a gradually decrease of available soil potassium was shown with a rate of about 1.90% per year from 128.08mg/kg in 1980 to 79.90mg/kg in 2008. As for sheltered grounds, the longer the sheltered ground was utilized,the higher the content of available N, P and K.
出处
《农业科技与装备》
2009年第2期14-16,共3页
Agricultural Science & Technology and Equipment
关键词
新民市
土壤
有效氮
有效磷
有效钾
Xinmin District
soil
available nitrogen
available phosphorus
available potassium
