2021年12月6日 星期一
钾肥对假俭草草坪种群形成的影响
The influence of potassium on population formation of Eremochloa ophiuroides lawn
2004年 第13卷 第4期 页码[24-27]    下载全文[0.7MB]  
摘要

以四川峨眉山野生假俭草(Eremochl oaophiuroides L.)为实验材料,施以不同浓度的K肥(1 0~2.5g·m-2K2O),观察草坪种群形成过程。结果表明,1.0和1.5g·m-2K2O处理组假俭草的生长速度与对照差异显著(P<0.05);1.0、1.5和2.0g·m-2K2O处理组的平均分蘖数与对照的差异达极显著水平(P<0.01);1.5g·m-2K2O处理组根系长度与对照差异达显著水平(P<0.05);4个处理组的根冠比分别比对照增加了35.61%、50.61%、21.91%和20.90%。其中1.5g·m-2K2O处理组与对照差异达显著水平(P<0.05)。低浓度处理(1.0和1.5g·m-2K2O)使草坪成坪时间提前3~5d。钾对假俭草草坪种群形成有影响,适宜施用量为1.0~1.5g·m-2K2O。钾肥主要在施用1~3周内起作用,5~10d肥效高,而后逐渐减弱。

Abstract

Through random trial design with four K gradients(1.0,1.5,2.0 and 2.5 g·m- 2K2O),the effect of potassium on lawn population formation of wild Eremochloa ophiuroides L. from Mt. E-mei in Sichuan Provincewas investigated. It was found that compared with the control, both 1.0 and 1.5 g·m- 2 K2O treatments had a significant difference in growth velocity(P< 0.05); for average tiller number, 1.0- 2.0 g·m- 2 K2O treatments were all highly significant(P< 0.01); as to root system, 1.5 g·m- 2 K2O treatment was significantly different with CK. The root/shoot ratio of four treatments increased by 35.61%, 50.61%, 21.91% and 20.90% respectively, and 1.5 g·m- 2 K2O treatmentwas significant difference with CK. Both 1.0 and 1.5 g·m- 2 K2O treatments could form. lawn ahead of 3- 5 d. Therefore, K has a positive effect on lawn population formation and the proper fertilizer quantity is 1.0- 1.5 g·m- 2 K2O.After K applied, it has obvious effect in 1- 3 weeks and the high efficiency is after 5- 10 d and gradual weakening after that.

关键词假俭草; 草坪; 钾肥; 种群; 根系;
Key wordsEremochloa ophiuroides L.; lawn; Potassium; population; roots
作者刘金平1,游明鸿1,2,毛凯1,张新全1
所在单位1.四川农业大学草业科学系,四川雅安625014;
2.四川省草原研究所,四川成都611731
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基金项目四川省青年基金资助项目(02ZQ026 057); 国家科技部星火计划资助项目(2004EA810010);