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作 者 ：高 静,梁银丽,贺丽娜,周茂娟,韦泽秀,栾正春.

期 刊 ：中国生态农业学报 2008年 16卷 6期 页码：1371-1374

关键词：南瓜；氮；磷；钾；高糖；低硝酸盐；施肥模式；

Keywords:Sandy coast, Casuarina equisetifolia, Protection forest, Regeneration pattern, Fractal dimension, Soil structure, Soil physical and chemical property,

摘 要 ：采用N、P、K 3因素最优设计，在陕北黄土高原进行了南瓜氮、磷、钾用量及其肥效反应模式田间试验，研究不同施肥量对南瓜硝态氮、可溶性糖两项营养品质的影响，旨在探讨南瓜品质高糖低硝酸盐的N、P、K肥效反应模式，提出优化的施肥方案。结果表明，N肥单因素对南瓜硝态氮和可溶性糖含量影响最大，K肥单因素对南瓜硝态氮和可溶性糖含量影响不显著，N与P交互作用对南瓜高糖低硝酸盐影响显著，K肥施用量一定时，氮肥与磷肥的施用量不易过大。根据南瓜N、P、K肥效反应模式，筛选出南瓜品质硝态氮含量在200 mg·kg^-1以下、可溶性糖含量在7%以上的较佳施肥量为施氮95～120 kg·hm^-2，施磷40～70 kg·hm^-2，施钾35～80 kg·hm^-2，N∶P₂O₅∶K₂O=1∶0.42∶0.37。

Abstract: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 NO₃^--N and soluble sugar was investigated. The results show that N has a notable effect on pumpkin NO₃^--N and soluble sugar contents; that K has a minimal effect on pumpkin NO₃^--N and soluble sugar contents. The effect of N and P interaction on sugar and nitrate contents is significant, and N and P fertilization need not be high when K supply is optimum. The optimal fertilization doses of 95～ 120 kg·hm^-2(N), 40～70 kg·hm^-2(P) and 35～80 kg·hm^-2(K) with the ratio of N∶P₂O₅∶K₂O as 1∶0.42∶0.37 keeps pumpkin NO₃^--N content lower than 200 mg·kg^-1 and soluble sugar content higher than 7%.

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