河北省清河县东风社王什庄果树专业队,有一位贫农出身的老技术员张长安同志,是一位有长期经营果树经验的土专家。56年春天他嫁接了一棵鸭梨,58年9月就结了18个很大的梨子,每个约4～6两重;这个事实打破了“桃三杏四梨五”的老规律。这棵梨树只有162公分高,根颈粗是2.85公分,共有三个分枝, Qinghe County, Hebei Province, Dongshizhe Wang Shizhuang fruit trees professional team, a poor technician from the old technician Zhang Changan comrades, is a long-term management of fruit trees experience of soil experts. In the spring of 56, he grafted a pear, and in September 58, he got 18 big pears, each weighing about 4 to 6 double. This fact broke the old “peach, apricot and pear” law. This pear tree is only 162 cm high, root neck coarse 2.85 cm, a total of three branches,