施钾方法对土壤供钾能力及烤烟钾累积的影响

为探明钾肥施用方法、土壤供钾能力和对钾的吸收之间的内在关系，为烤烟生产合理分配和施用钾肥提供依据，以湖南烟区主要植烟土壤－石灰岩母质发育的红壤性水稻土为供试土壤，采用盆载土培方法，研究了施钾方法对土壤供钾能力及烤烟钾素积的影响。结果表明：烟苗移栽后30d施用钾量的40％，能够使土壤对生长发育中后期的烤烟维持较高的供钾能力，土壤速效钾和缓效钾含量比钾肥一次性作基肥施用的处理分别提高了57．4～60．9％和5．7％～6．2％，同时可促进烤烟对钾的吸收与累积，使烟株的总吸钾量提高5．0％和15．5％，烟叶的含钾量提高了4．6％和12．2％。

Effects of Potassium Application Methods on Potassium Supply Capability of Soil and Potassium Accumulation in Flue-cured Tobacco

A plot experiment was conducted by using the method of plot culture and the main tobacco soil in Hunan-red earth paddy soil,developing from limestone matrix,as the experimental soil.The results show that applying 40% of total potassium 30 d after transplanting,the supply capability of soil potassium keeps at a high level at mid stage and late stage of tobacco growth.The contents of quick acting available potassium and slow acting available potassium in soil increase by 57.4%~60.9% and 5.7%~6.2% respectively compared with the treatment that potassium fertilizer is applied in a once for all method.Potassium uptake and accumulation by tobacco are promoted that the total amount of potassiumuptaken by tobacco increased by 5.0% and 15.5%,and potassium contents in tobacco leaf increase by 4.6% and 12.2%.