钾肥施用量对烟叶及土壤钾含量的影响

采用盆栽试验研究了不同K肥施用量对烟叶K和土壤K含量的影响.结果表明,青烟叶、烤后下部烟叶和中部烟叶K含量、土壤速效K、缓效K、全K含量随着K肥施用量的增加而增加.在烟株的整个生育过程中,土壤速效K含量一直在降低;土壤缓效K除CK外均表现为先增加后降低又增加的趋势;土壤全K含量变化幅度较小.青烟叶和烤后烟叶K含量与土壤中3种K含量均呈正相关关系,大部分达到显著或极显著水平,表明施用K肥有助于提高青烟叶和烤后烟叶K含量.

Effect of Different Potassium Application Rate on the Potassium Contents in Tobacco Leaves and Soil

Experiments in pot were carried out to study the effect of different potassium application rate on the potassium contents in tobacco leaves and soil in cinnamon soil area.The results showed that,the potassium contents in green leaves,lower leaves,cutters,the contents of readily available potassium,slow-release potassium and total potassium in soil increased with the increasing of potassium application rate.During the whole growing period,the soil available potassium contents were always detracting,slow-release potassium contents showed increasing trend at forepart,decreasing trend at metaphase and increasing trend at anaphase besides CK,but the contents of total potassium in soil had changed little.The leaves after curing potassium contents had significant or mighty significant correlation between the potassium contents of readily available potassium,slow-release potassium and total potassium in soil,which indicate that at a certain potassium application rate using potassium fertilizers for several times at forepart and anaphase during one growing period would contribute to the increase of the potassium contents in flue-cured tobacco leaves.