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出身于产棉大县,从小目睹过不少棉农们呵护棉苗的情景。他们视棉苗为命根子,但到一定时候却又毫不犹豫地把苗头去掉,名曰“打顶”。后来上初中学了生物方知:植物一般都具有顶芽发育优先,同时抑制侧芽生长的“顶端优势”现象。为了能多开花结果,棉农们不得不对“顶端优势”加以限制。同样是对待“顶端优势”这一自然现象,人们在种植用材林时,为确保主干长得又高又直,则要剪去侧枝任田顶芽生长,才能使其成为栋梁之材。可见,人们是根据植物自身的生长规律和人类的实际需求去选择取舍的。
Born in cotton-producing counties, I have seen many cotton farmers care cotton seedling scene. They regard life as a seedling cotton seedlings, but at a certain time they did not hesitate to remove the signs, the name “topping.” Later on junior high school biological know: Plants generally have the top bud development priority, while inhibiting lateral bud growth “top advantage” phenomenon. In order to be able to bear fruit, cotton farmers have to limit the “top advantage.” The same is to treat the “top advantage” of this natural phenomenon, people planting timber forests, in order to ensure that the trunk looks tall and straight, then cut off the top branches of any growth, in order to make it a pillar material. Can be seen, people are based on their own growth patterns and human needs to choose the actual choice.