Effects of Fertilization Patterns on NH+4N and NO-3N in Solar Greenhouse Soils
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    Abstract:

    Over the course of two rape growing cycles, fertilization types and application rates affected plant growth and groundwater pollution from solar vegetable greenhouses in Beijing agricultural region were studied. Seven fertilization patterns were selected, and in each treatment, the NH+4N and NO-3N migration and accumulation in 0~200cm solar greenhouse soil and the affect on rape yield were studied. The results showed that the different fertilization patterns mainly affected the average NH+4N accumulation and content in the 0~40cm soil layer. Average soil NH+4N accumulation and content was larger in the treatment of only chemical fertilizer than that of only organic manure. When N application rate was less than 383kg/hm2, the average soil NO-3N accumulation and content in the 0~40cm soil layer were found to be in the following descending order: use of only chemical fertilizer, use of only organic manure, use of both organic manure and chemical fertilizer. The different fertilization patterns also affected the migration and accumulation of NO-3N in 40~160cm soil. It is concluded that organic manure (N application 150kg/hm2) mixed with chemical fertilizer (191kg/hm2) is the best fertilization pattern for planting rape in solar greenhouses in Beijing agricultural region.

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  • Online: July 02,2012
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