优质烤烟对不同种类钾肥的吸收效应

以云烟87为材料,通过小区田间试验,研究了优质烤烟对不同种类钾肥的吸收效应。结果表明,与不施钾对照相比,施钾增加了烟株干物质积累。不同钾肥品种间相比,在移栽60 d以后,以生物包膜缓释钾肥处理干物质积累量最高。施钾提高了土壤速效钾含量和烟株钾含量,在移栽后45 d以前,以碳酸钾处理对土壤速效钾和烟株钾含量的提高效果最好;在移栽60 d以后,土壤中速效钾和烟株各部位钾含量均以生物包膜缓释钾肥处理最高。收获期与常规硫酸钾处理相比,生物包膜缓释钾肥处理和碳酸钾处理钾素利用率分别提高16.81和7.93个百分点。从烤后烟叶钾含量分析,生物包膜缓释钾肥处理和碳酸钾处理均显著提高了烟叶钾含量。综合分析,以生物包膜缓释钾肥和碳酸钾肥代替常规硫酸钾肥能提高钾素利用率和烟叶钾含量,建议在生产上推广应用。

Effects of different potassium fertilizations on potassium absorption of flue cured tobacco

The flue-cured tobacco variety Yunyan 87 was selected to study the effect of different potassium fertilizations on potassium absorption.The results showed that compared with no potassium application treatment,potassium application increased dry matter accumulation of plant.Among different potassium fertilizations,the dry matter accumulation of BCPF (biomaterialenveloped controlled-release potassium fertilizer) treatment was the highest after 60 days of transplanting.Potassium application increased the readily available potassium in soil and the potassium concentration in plant.Before 45 days after transplanting,the readily available potassium in soil and the potassium concentration in plant with PC (potassium carbonate) treatment were the highest.After 60 days of transplanting,the readily available potassium in soil and the potassium concentration in different plant parts with BCPF treatment were the highest.Compared with conventional PSF (potassium sulphate fertilizer)treatment,the BCPF treatment and PC treatment increased the potassium use efficiency by 16.81 and 7.93 percentage points respectively.By analysis from potassium content of baked tobacco leaves,the BCPF treatment and PC treatment significantly increased the potassium content.It was concluded that instead of conventional PSF,BCPF and PC application could increase potassium use efficiency and potassium content in leaves,and should be used in flue-cured tobacco production.