草地早熟禾不同品种生长与分蘖特性的研究

A comparison on growing and tiller characteristics among varieties of Poa pratensis

连续2年对28个草地早熟禾品种的生长速度及分蘖动态进行了研究。生长速度测定结果表明,品种间株高及日增长速度存在极显著差异,可分为4～6级,其中生长最慢的品种为Baron、Elysee、Miyacie和Pepaya,生长最快或较快的品种为Balin、Bar5649、Mardona、Monoply、Oxford、Baronie和Wembley,其余品种为中等或较低。分蘖动态结果表明,品种间不同阶段的分蘖数及2龄和3龄的年总分蘖数存在显著或极显著差异,均可分3级,2龄分蘖数最多的为Fylking和Sydsport2个品种;3龄早熟禾分蘖最多的为Andante、Balin、Broadway和Elysee等4个品种;2年总分蘖数最多的为Pepaya、Parade、Julia、Fylking和Sydsport等5个品种。大多数品种分蘖高峰期在春季(4～5月),少数延续至6月中旬。依据对平均日增长速度和总分蘖数进行聚类分析,可将28个品种生长特性分为强、中等和差等3个类群。

Growth rate and tiller dynamics of 28 varieties of Poa pratensis were evaluated from 2001 to 2002 in field plots at Lanzhou, China. The results showed that the varieties could be divided into 4 to 6 groups according to their significant difference in plant height and average daily growth rate. Varieties of the lowest growth rate were Baron,Elysee,Miyacie and Pepaya;the highest were Balin,Bar 5649,Mardona,Monoply, Oxford and Wembley. The difference of tiller number in each stage and annual total tiller number were significant among varieties. The varieties with the highest tiller numbers in the second year were Fylking(111.7 /100 cm2) and Sydsport(115.8/100 cm2);in the third year, the varieties with the highest tiller number were Andante,Balin,Buroadway and Elysee(51.566.0/100 cm2),in the second and third year, the varieties with the highest total tiller numbers were Pepaya,Parade,Julia,Fylking and Sydsport. The result of cluster group analysis for the average daily growth rate and total tiller number based on growing characteristics showed that the 28 varieties could be divided into 3 grades.