广西植烟土壤特征分析

Analysis of soil Characters for Tobacco in Guangxi

广西适宜种植优质烟的土壤主要有９个土壤亚类，分别属于紫色土、红壤、赤红壤和棕色石灰土类，其共同特征是土层深厚，耕层疏松，结构性、通气性、透水性良好，有机质含量适中，养分协调，其中有机质合量多数为１．０％～３．０％，平均全量氮０．１３３％，磷０．０５１％，钾１．２１％；碱解氮８５×１０－６，速效性磷１３．８×１０－６，钾１０１．７×１０－６；交换性钾平均０．２４ｍｅ／１００ｇ土，缓效性钾１１８．５×１０－６。土壤呈微酸性至中性，以ｐＨ５．５～６．５居多。酸碱度适宜，钾含量高，部分地块应增施有机质、磷、钙、镁肥。所产烟叶以丘陵、岗地和雾露较多的向阳山麓质量最佳。

Nine soil subgroups are suitable for flue-cured tobacco in Guangxi. They belong to purple soil,red eath,lateriric red eath and brown limestone soil,respectively,which are commonly characterized by deep and loose plowing horizon,adequade aeration and water permeability,and proper organic substance content with nutrient balance.The organic substance content is 1.0--3. 0%, total Nitrogen 0.133%, phosphorus0. 051 %,Potassium 1. 2%,alkalihydrolyzable Nitrogen 85 × 10-6,available phosphorus 13. 8× 10-6,Potassium 101.7 × 10-6,exchangeable Potassium 0. 24me/100g soil,and slow-releasePOtassium 118. 5× 10-6. The soil is from slightly acid to neutral,with PH5. 5-6. 5.