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榆树“冬打头、夏控侧”是武清县东州大队广大贫下中农在林业生产实践中创造出来的科学管榆树的新方法。我县从1972年开始推广,至1973年基本推开。据统计,1973年“冬打头”的榆树约有300万株以上,占全县榆树总株数的60％以上。据我们调查,凡正确运用“冬打头、夏控侧”技术的,榆树长势旺盛,主侧分明,干直饱满;反之,技术掌握不当的,树形混乱,主干生长也弱。归纳起来,有以下几个方面:
Elm “winter head, summer control side” is Wuqing County Dongzhou brigade majority of poor and middle peasants in forestry production practice to create a new method of scientific tube elm. My county started to promote from 1972 to 1973, basically opened. According to statistics, about 3 million elm trees were recorded in the winter head in 1973, accounting for more than 60% of the total number of elm trees in the county. According to our investigation, if we make proper use of the technology of “winter head and summer control side”, elm grows vigorously and the main sides are distinct and dry. On the contrary, the technology is improperly handled, the tree shape is chaotic, and the trunk growth is weak. To sum up, there are the following aspects: