施钾对草地早熟禾根部可溶性碳水化合物及叶片氮，磷和钾含量的影响

以草地早熟禾（Poapratensis）品种男爵（Baronie）为试验材料，研究了不同施钾处理对根部0～10cm可溶性碳水化合物和叶片氮，磷和钾含量的影响。结果表明：在单施钾肥的情况下，随着施钾量的增加，越冬前草地早熟禾根系可溶性碳水化合物的含量也显著提高（P〈0．05），这可能有助于提高植株越冬率，促进返青生长，而在同时施有氮、磷的情况下，碳水化合物含量间的差异并不显著，草地早熟禾叶片氮、钾含量也随着施钾量的增加呈显著增加的趋势（P〈0．05）。通过碳水化合物及叶片氮，磷和钾含量的测定，以N5g／m^2＋P20s3．33g／m^2＋K2O 6．68g／m^2处理对草坪返青及分蘖最佳。

Effect of potassium application on N,P and K contents in leaf and water-soluble carbohydrate content in root of Kentucky bluegrass

The experiment was conducted to study the effect of potassium fertilizer on the content of water-soluble carbohydratein root and nitrogen,phosphorus and potassium content in leaf of Kentucky bluegrass(Poa pratensis).The results showed that the potassium application significantly increased the content of water-soluble carbohydrate in root before winter,and which might imply the improved the winter-hardiness and growth in the next year.With the increase of the potassium application rate,the contents of N and K in leaf went up significantly.The best turf quality was detected in the plots treated with mixed fertilizer of N 5 g/m2 +P2O5 3.33 g/m2+K2O 6.68 g/m2,and it could be concluded that maintaining nutrient balance among N,P and K was vital for turf quality improvement.