论文部分内容阅读
我场近来在园艺学组及科研室主持下,座谈了苹果黄叶病的发生及防治,并邀请了场内领导、生产队长和部分技术工人参加。经过大家认真讨论,取得了一定成绩。我场苹果树每到6月上旬新梢顶端的叶子先变黄白色,以后再由新梢的顶部向下扩展,严重时叶子的边绿逐渐干枯,终于变为褐色死亡。与缺铁的情况相符。6月中旬我们用4/1000的硫酸亚铁喷桃的黄叶部分,一周后发现叶片出现绿色斑点,表现有复绿的现象;7月上旬用0.5%硫酸亚铁浸苹果被害部分的新梢,一周后叶片全部复绿,对照仍为黄色。看来,苹
Recently, under the auspices of the Horticulture Section and the Scientific Research Section, my field talked about the occurrence and prevention of apple yellow leaf disease and invited field leaders, production captains and some technical workers to attend. After careful discussion, we achieved certain results. My field of apple trees in early June each tip of the top of the first yellow to white, and then from the top of the shoots to expand downward, serious when the edge of the green leaves gradually dry, and finally turned brown death. In line with the situation of iron deficiency. In mid-June, we used 4/1000 ferrous sulfate peach yellow leaves part of the week after the discovery of the leaves appear green spots, showing the phenomenon of complex green; early July with 0.5% ferrous sulfate immersed apple shoots part of the shoot After a week leaves all green, the control is still yellow. It seems, Apple