一、问题的发现今年新学期,我发现今年上半年六年级种的毕业树(广玉兰)长势良好,枝叶已经逐渐茂盛起来,而上一届毕业生种下的那棵广玉兰明明早移植一年,反而有很多枝条枯萎,病蔫蔫的样子。我回家问爷爷,爷爷是绿化方面的专家。他告诉我,这两棵树都是我们家移植过去的,今年高温天气少,雨水充足,而去年正好遇上干旱和高温, First, the discovery of the problem This year, the new semester, I found that graduation tree (Magnolia grandiflora) of the sixth grade in the first half of this year growing well, branches and leaves have gradually flourished, and the last graduated planted Magnolia grandis a transplant tomorrow Years, on the contrary, there are many branches withered, sickly look like. I went home to ask my grandfather, my grandfather is greening expert. He told me that these two trees were all transplanted by our family in the past. This year there was little hot weather and plenty of rain, and last year happened to encounter drought and heat,