氮肥和Trinexapac-ethyl对草地早熟禾草坪生长的影响

Effects of Nitrogen and Trinexapac-ethyl on Growth of Kentucky Bluegrass

[目的]探明氮肥和Trinexapac-ethyl(TE)对草地早熟禾草坪生长的影响。[方法]采用随机区组设计对草地早熟禾草坪的剪草量及颜色进行评定。其中,氮肥设4个水平:0(N1)、20(N2)、25(N3)、30(N4)kg/(hm2·month),TE设3个水平0(TE1)、312.5(TE2)、625.0(TE3)ml/(hm2·10d)。[结果]不同氮素水平和不同TE水平处理间,剪草量在各个时期差异都达极显著水平(P<0.01);N与TE的互作对草坪草剪草量影响差异不显著;在试验的各个时期,不同氮素水平下,TE2、TE3处理都比TE1处理的剪草量显著降低。不同氮素水平处理间,叶绿素含量在各个时期差异均达极显著水平(P<0.01),不同TE水平处理间以及N与TE的互作效应对草坪叶绿素含量影响在6月份后达到极显著水平(P<0.01)。在试验中,在不同时期4个氮素水平的叶绿素含量均是TE3处理含量高于TE1处理。[结论]在各个氮素水平下,使用TE均能够抑制草坪生长,改善草坪颜色。

[Objective] The experiment aimed to evaluated the effects of N fertilizer and Trinexapac -ethyl to the growth of Kentucky bluegrass. [Method] The clipping yield and chlorophyll concentration of Kentucky bluegrass were assessed by using the method of randomized blocks design. N fertilizer was designed 4 levels, including 0（N 1）, 20（N2）, 25 （N3）, 30（N4） kg/（hm^2·month） respectively. TE was designed 3 levels, including 0 （TE1）,312.5 （TE2）,625.0 （TE3）ml/（hm^2·10 d） respectively. [Result] The results showed that the differences on the Kentucky bluegrass total clippings were remarkable among the treatments under different TE application level and under different N fertilizer level during the whole experiment. The NxTE interaction was not significant for total clippings. The total clippings of Kentucky bluegrass treated with TE2 and TE3 had reduced significantly than those treated with TE1 among the same N fertilizer level. The differences on the chlorophyll concentrations of Kentucky bluegrass were remarkable during the whole experiment under different N fertilizer level treatments. TE and the NxTE interaction significantly influnced the chlorophyll concentrations of Kentucky bluegrass after a month of the experiment. The chlorophyll concentrations of Kentucky bluegrass treated with TE3 were significantly higher than those of Kentucky bluegrass treated with TEl at the same N fertilizer level during the whole experiment. [Conclusion]Application of TE on Kentucky bluegrass under different N fertilizer levels could reduce the growth of Kentucky bluegrass and enhance the color of the Kentucky bluegrass turf.