The optimization design of the three ingredients(NPK) was adopt in a field experimentation on pumpkin in the Loess Plateau of Shaanxi Province.The effect of different fertilizer doses on pumpkin quality with regard NO_3~——N and soluble sugar was investigated.The results show that N has a notable effect on pumpkin NO_3~——N and soluble sugar contents;that K has a minimal effect on pumpkin NO_3~——N and soluble sugar contents.The effect of N and P interaction on sugar and nitrate contents is significant,and N a...
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