pH值对绿豆种子萌发和幼苗生长的影响

【目的】研究不同pH值溶液及其不同浸泡时间对绿豆种子萌发和幼苗生长的影响，为在南方地区通过科学育苗减少土壤酸胁迫提供科学依据。【方法】用pH值6.0～8.0溶液分别浸泡绿豆种子6、12 h，观察绿豆种子萌芽及幼苗生长状况。【结果】当溶液pH值为7.5时, 绿豆种子萌发速度最快、数量最多，2 d后浸种6、12 h的发芽率分别为87.5%和92.5%；浸种6、12 h，播种4 d后分别以pH值7.5和7.0处理的幼苗株高最高。浸种6、12 h时，分别以pH值6.5、7.0处理的绿豆幼苗鲜重最高，而均以pH 8.0处理的幼苗干重最高。【结论】在广西贺州地区，适宜绿豆发芽及苗期生长的浸种溶液pH值为7.0～7.5，pH过高或过低均不利于绿豆的萌发和生长。

Effects of applying different pH values on mung bean seed germination and seedlings growth

【Objective】This research investigated the effects of applying different pH values and determining the pH soaking time on mung bean seed germination and seedlings growth in order to provide basis for reducing soil acidity stress by scientifically raising seedlings in Southern China bean planting aren. 【Method】The experiment was designed with 5 different degrees of pH values and 2 soaking times. The seed germination and seedling growth of mung bean were observed. 【Result】The results showed that the germination speed was the fastest out of all treatments when the pH level was 7.5； under this pH level， the most numerous seedling germination was also observed. Two days after the seeds were soaked in pH 7.5 solutions for 6 and 12 hrs， the germination rate was 87.5% and 92.5%， respectively. On the other hand, four days after seeding， the tallest seedling plant height were measured after the seeds were soaked for 6 and 12 hrs under the pH solution of 7.5 and 7.0， respectively. For all seeds soaked for 6 and 12 hrs under pH level 6.5 and pH level 7.0， respectively， their seedlings showed the highest fresh weight， while those soaked in pH level 8.0 showed the heaviest dry seedling weight. 【Conclusion】The optimal pH value for soaking mung bean seeds should be between 7.0-7.5 to achieve the best mung bean germination and seedling growth in Hezhou districts of Guangxi.