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  

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

作　　者：祝美俊 牛建忠 薛建国[3] 耿智广[3] 谭玉霞[3] 王显国[3] 

机构地区：[1]北京金都恒达园林绿化处东北旺苗圃,北京100094 [2]北京市天坛公园,北京100061 [3]中国农业大学草业科学系,北京100094

出　　处：《草原与草坪》2008年第3期1-6,共6页Grassland and Turf

基　　金："十一五"科技支撑项目(2006BAD16B09);中国农业大学科研启动项目(2006003)资助

摘　　要：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。The experiment was conducted to study the effect of potassium fertilizer on the content of watersoluble 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/m^2＋ P2O5 3.33 g/m^2 ＋K2O 6.68 g/m^2,and it could be concluded that maintaining nutrient balance among N,P and K was vital for turf quality improvement.

关 键 词：草地早熟禾 钾 可溶性碳水化合物 养分含量 

分 类 号：S143.3[农业科学—肥料学] S688.4[农业科学—农业基础科学]