摘要
1980年张掖市土壤养分状况为有机质含量偏低，高钾、低氮、极缺磷。2004年有机质下降2．5g／kg，全氮增加0．122-0．367g／kg、水解氮增加6．8mg／kg，全磷增加0．034-0．741g／kg、有效磷增加9．7～11．5mg／kg，速效钾降低3．1～24．6mg／kg。应采取增加土壤有机质的投入；合理轮作；推广免耕法和少耕法；提高肥料利用率等措施改良土壤。
In 1980, the soil nutrient in Zhangye are as following： low content of organic matters and nitrogen, high content of potassium, extremely deficient in phosphorus. At present, organic matters decline by 2. 5 g/kg, nitrogen increases by 0. 122-0. 367 g/kg.hydrolyzed nitrogen increases by 6. 8 mg/kg,phosphorus increases by 0. 034-0. 741 g/kg.effective phosphorus increases by 9. 7-11.5 mg/kg,quick acting potassium declines by 3. 1-24.6 mg/kg. The input of organic matters is reduced and that of fertilizer increased. Fertilizer products are used in current agriculture production. We can take measures such as increasing the input of organic matters, rational crop rotations, tillless method, fewer-till method to maintain soil fertility.
出处
《甘肃农业科技》
2007年第11期38-41,共4页
Gansu Agricultural Science and Technology
关键词
土壤养分
变化规律
改良
Soil nutrient
Changing regularities
Reform
