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六十年代初,河北省怀安县怀安城镇张杞屯村在村西北的口外梁上栽了一片杨树。由于地处风口,土质坚硬,立地条件差,大多长成了小老树,甚至有的杨树主干分枝不明显,成了灌木丛。面对这样一片小老树,人们常常发生叹息:砍掉重栽有点可惜,留着又没有成材的希望,经济效益实在太低。一九八四年春,该村在刘雁声同志的倡导下,发动群众搞了一部分小老树平茬更新试验,首先给小老树按整地要求设埂围堰,拦截自然降雨,保持水土。然后将小老树齐地面剪断,再把根部的土翻松,施些肥料,最好是有机肥料,可改变土壤的透水
In the early 1960s, Zhang Qitun Village, Huaian Town, Huai’an County, Hebei Province, planted poplar trees on the open mouth of the village northwest of the village. As located in tuyere, soil tough, poor site conditions, most of them grow into small trees, and even some trunk branches are not obvious, has become a bushes. In the face of such a small tree, people often sigh: cut replant a little pity, keep there is no hope of survival, economic efficiency is too low. In the spring of 1984, under the advocacy of Comrade Liu Yansheng, the village was mobilized to carry out a number of small old tree stubble renewal experiments. First, small caterpillars were set up to coffer cofferdam to intercept natural rainfall and keep soil and water. Then small trees cut off the ground together, and then the roots of soil loosening, some fertilizer, preferably organic fertilizer, can change the soil water