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通过对陕西洛南、旬阳、陇县3个典型植烟区剖面及耕层土壤理化指标的测定,采用主成分分析法,对3个植烟区土壤理化特性和肥力进行研究。结果表明:3地土壤体积质量和紧实度均偏高,属壤质粘土,pH偏高(洛南适宜除外);有机质含量偏低,氮含量偏低(洛南适宜除外),磷含量缺乏,钾含量较丰富。洛南土壤肥力指数最高,属1级;旬阳次之,属2级;陇县较小,属3级。3个植烟区可通过土壤改良剂及增施有机肥和平衡施肥等措施,促进烤烟生长发育及产质量提高。
Through the analysis of the profile and soil physical and chemical indexes of three typical tobacco-growing areas in Luonan, Xunyang and Longxian of Shaanxi Province, the soil physicochemical properties and fertility of three planting areas were studied by using the principal component analysis. The results showed that: 3, soil bulk density and compaction were high, which belonged to loamy clay with high pH (except for Luonan); low organic matter content, low nitrogen content (except Lucanan), low phosphorus content , Potassium content is more abundant. Luonan soil fertility index highest, is a; Xunyang second, is a 2; Longxian smaller, is a 3. The three tobacco-planting areas can promote the growth and yield and quality of flue-cured tobacco through such measures as soil conditioner, organic fertilizer application and balanced fertilization.