自一九五八年九月于兴城召开的全国第一次果树会議上,提出关于保花保果与疏花疏果問題的讨论以后,果树工作者在党的百花齐放、百家爭鳴的方針指引下,暢所欲言,各抒己見,大大活跃了学术空气,推进了果树科学研究。目前,果树界对保花保果的性貭和涵义,对疏花疏果和不疏花不疏果的利弊和作用以及对落花落果原因和保花保果技术措施尚有不同見解和主張。这里,我想就三年来在棗树保花保果研究工作中的一些体会,談談对这一问题的粗淺看法。一、什么是保花保果的实质? 果树的落花落果程度,依树种、品种、土地环境条件和农业技术措施有所不同,但在一般情况下,落花落果的百分率都是相当严重的,萍果中的紅玉、祝光等座果率不到10％,而华中的橘和华北的棗着果率仅为 Since the first meeting of the fruit trees held in Xingcheng in September 1958 in the country, a discussion was held on fruit preservation, fruit thinning and fruit thinning, fruit tree workers, guided by the party’s flourishing and contentious spirit , Speak their minds, express their views, greatly active academic atmosphere, promote the scientific research of fruit trees. At present, there are different opinions and opinions about the nature and meaning of the fruit-tree protection and fruit preservation, the pros and cons of the fruit-thinning and non-fruit-thinning, the reasons for the fruit drop and the fruit-protection techniques. Here, I would like to comment on the superficial views on this issue in the past three years in the research on the protection of jujube tree flowers and fruits. First, what is the essence of flower and fruit preservation? Fruit tree fall and fall degree, according to tree species, varieties, land environmental conditions and agricultural technology measures are different, but in general, the percentage of falling flowers is very serious, Fruits such as ruby, Zhuangguang and other fruit set rate of less than 10%, while the Central Orange and North China jujube fruit rate was only