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《Acta Agriculturae Boreali—Sinica》 1992-02
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The Cycling of Fertilizer N in the Ecosystem of Film Mulching

Yang Jingqiu Liu Jincheng Bai Chengyun(Soil and Fertlizer Institute, Shanxi Academy of Agricultural Science!,Taiyuan 030031)  
15N was used to study the cycling of fertilizer N in the ecosystem of film mulching. Results showed that 18.56% of the N in the corn stalks, returned to the field under the conditions of film mulching, was absorbed by the first crop corn, while 59.09% was left in the soil. The second crop wheat and the third crop summer millet absorbed 4.04% and2.89% of the stalk N respectively. Corn utilized 38.44% of the ammonium sulfate, of which 15.80% was distributed among the stems, leaves and roots, participating in the recycling of nutrients. But, in this way, the loss of N was rather great, amounting to about 50% of the N input. 3.4% of the stalk N residue left in the soil was in the undecomposed stalk while 3.5% moved to the lower stratum (30-50cm) , and 45.8% was combined with soil minerals. There was very little fertilizer N residue left, most of which entered the organo-mineral complex, while a part of the soil N was activated.
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