土壤质地等对烤烟生长及钾素营养的影响

Studies on growth and K nutrition of fluecured tobacco affected by soil texture OM and pH value

为探讨优质烤烟生产理想的土壤条件，通过２年烤烟盆栽试验，研究了土壤质地、有机质及ｐＨ值等对烤烟生长及钾素营养的影响。试验条件下，烟叶产量与土壤中粘粒和物理性粘粒百分含量均呈极显著负相关。有机质有增加烟叶产量的作用，对质地轻的土壤尤为突出。通过酸性土上调和下调ｐＨ，中性土下调ｐＨ以及酸性土本身得出的结果，ｐＨ平均５１５～５４３的壤质土对烟株生长、产量以及吸钾量和施钾效果均有好的作用。有机质含量１５～２０ｇ／ｋｇ的酸性壤质土种植烤烟能明显提高烟叶含钾量且施肥的效益好。

Pot experiments for studying the growth and K nutrition of fluecured tobacco plants were carried out in 1995 and 1996 by liming or adding FeSO4,sulfur powder and OM to regulate the pH value and OM contents of soils. The main results obtained are as follows:there are obviously negative relations between tobacco leaf yields and partical contents of <0001 mm% and <001 mm% in soils.In general tobacco leaf yields are positively increase with soil OM contents, but suitable OM contents for tobacco sturdy growth are greatly different in soils with different clay contents.According to the study,the desirable conditions for tobacco plant growth and K nutrition and for high quallity fluecured tobacco production are those loam soils with OM content 15%20% and average pH values of 515543.