皖南烟区白云石粉对酸性植烟土壤的改良研究

Amelioration of Dolomite on Acidity of Flue-cured Tobacco Soil in South Anhui

采用盆栽与室内分析的方法，研究了不同粒径与用量的白云石粉对植烟土壤的酸性改良效应。结果表明：白云石粉越细、用量越高，改良越快，效果越明显，持续时间越短；白云石粉应在烟苗移栽前30天左右使用；若土壤pH的调整目标值为1个单位或施用量为l500kg／hm2时，粒径为250μm的白云石粉较为经济；土壤交换性铝含量较土壤pH更能反映烟草植株生长情况，其临界指标为0．30～0．45cmol／kg，高于此临界值，应施用白云石粉进行调酸。

Pot-experiments were conducted to study the amelioration of dolomite on soil acidity of flue-cured tobacco. The result showed that with the increase of dosage and decrease of particle size of dolomite, the amelioration effect became more obvious. Dolomite should be used 30 days before tobacco transplanting. If the soil pH value adjustment target is 1 unit or the application of dolomite is 1 500 kg/hm2, the particle size of 250 μm dolomite powder was more economic. As the pH value of soil, the exchangeable A1 content can more reflect the growth of tobacco plant, its critical indicators is 0.30-0.45 cmol/kg, if the content is higher than the critical value, dolomite should be used to adjust acidity.