长期定位施肥对黑土耕层土壤养分状况的影响

通过20年长期定位施肥试验研究了不同施肥处理对黑土耕层土壤养分的影响。结果表明:施氮可以增加土壤碱解氮的含量,施磷肥可以增加土壤全磷、速效磷的含量,施钾可以增加速效钾的含量。定位施肥20年后,施氮肥的处理碱解氮比试验前增加2.61￣6.41mg/kg,不施氮肥的处理碱解氮比试验前降低14.97￣20.66mg/kg;施磷肥处理全磷和速效磷含量均有增加,分别比试验前增加0.296￣0.316g/kg和48.25￣53.16mg/kg;施钾肥的处理速效钾比试验前增加129.03￣154.75mg/kg,不施钾肥的处理比试验前降低23.28￣68.75mg/kg。

Effect of Long-term Fixed Position Fertilization on Nutrition in Topsoil of Black Earth

The effect of different fertilizer treatments on nutrition was studied in a long-term fixed position fertilization experiment last for twenty years.The results showed that: the content of alkaline-hydrolysable N increased by the application of N fertilizer,the content of total P and available P increased by the application of P fertilizer,and the content of available K increased by the application of K fertilizer.After 20 years,comparing with that of pre-experiment,the alkaline-hydrolysable N increased 2.61-6.41 mg/kg in nitrogen application treatment,and it decreased 14.97-20.66 mg/kg in no nitrogen application control.Meanwhile,the total P and available P increased by 0.296-0.316 mg/kg and 48.25-53.16 mg/kg respectively by the application of P fertilizer.In the treatment of K application,the content of available K increased 129.03-154.75mg/kg,whereas in the control of no K application,it decreased 23.28-68.75 mg/kg.