核桃是经济价值很高的木本油料树种,长期以来,我国劳动人民积累了丰富的栽培经验。但是,在采收时间上还存在一些问题:如北京郊区,有的地方怕丢失,有的怕收晚了影响种麦,就提前打核桃;还有的地方是由旧社会小农经济遗留下来的不合理的 Walnut is a woody fuel tree with high economic value. For a long time, our working people have accumulated rich cultivation experience. However, there are still some problems in harvesting time. For example, in the suburbs of Beijing, some areas are afraid of losing, and some may be afraid of late harvesting of wheat. They will play walnut ahead of time and others will be left behind by the small-scale peasant economy of the old society unreasonable