The distribution and accumulation of soil mineral N in soil profiles under different fertilization after 23-year wheat cultivation and alfalfa continuous cropping were studied,and as well as the effects of nitrate leaching in wheat cultivation and alfalfa continuous cropping.The results show that NO-3N is centralized in 0-60 cm soil layer in the CK and P treatments after 23year wheat cultivation and alfalfa continuous cropping,and the content of NO-3-N is less than 2 mg/kg below 60 cm-deep of soil profiles....
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