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杨树在宁夏引黄灌区的“四旁”绿化中,约占造林总数的70%。如何提高杨树“四旁”植树的成活率,是大家关心的问题。几年来,我们针对这个问题,先后在潘昶公社红星大队和四十里店公社光明大队,进行了试验研究,初步摸清了影响“四旁”栽植杨树成活的原因,提出了“杨树‘四旁’植树技术要点”。1977年和1978年春季,全县在农田基本建设基本定型的35个大队,按照“杨树‘四旁’植树技术要点”的要求栽植杨树784万株,成活率达90%以上,最高的大队达99.5%。
Poplar in Ningxia Yellow River irrigated area “green”, accounting for about 70% of the total afforestation. How to raise the survival rate of planting trees on the “four sides” of poplar is a matter of concern to all. Over the past few years, in response to this problem, we conducted experiments and studies on the Pan-commune Red Star Brigade and the Shiliashili Commune Brigade to find out the reasons that affected the survival of poplar trees on the “four sides” Four points ’tree planting techniques.’ In 1977 and the spring of 1978, a total of 7,840,000 poplar trees were planted in accordance with the requirements of the “tree planting techniques” on the four sides of poplar trees in the 35 basic brigade units in the basic farmland construction in the county with a survival rate of over 90%. The highest brigade Up to 99.5%.