为了探讨核桃的生长发育规律,了解树龄与产量、营养生长之间的关系,我们在河南省的核桃重点产区进行了连续三年的实地调查。现将调查结果整理如下。一、材料与方法调查对象为当地晚实型核桃树,调查地点分为郑州市、安阳市、洛阳、新乡、卢氏五个区,共设九块样地。为了使调查单株按 In order to explore the law of growth and development of walnut, understand the relationship between tree age and yield, vegetative growth, we conducted a field survey for three consecutive years in the key producing areas of walnut in Henan Province. The survey results are summarized below. I. Materials and Methods The survey was conducted on the local late-night walnut trees. The survey sites were divided into five districts including Zhengzhou, Anyang, Luoyang, Xinxiang and Lushi. In order to make investigation of the plant press