费县五圣公社周家庄大队的2.049亩板栗实验园,是1976年3月份新开垦的河滩地。当年四月上旬,分2×1.5米(0.964亩),2×3米(1.085亩)两种密度定植嫁接,完成了建园任务。第二年就有结果;第三年(1978年)2×1.5米园片折合亩产689.4斤;1980年是建园的第五年,据九月份栗树长势调查,2×1.5米园片的210株,平均干高2.96米,干粗7.46厘米,冠径2.44米,叶面积系数为4.41,单株平均 Feixian five holy commune Zhoujiazhuang brigade 2.049 acres Chestnut Experimental Park, is the March 1976 newly reclaimed beach. In early April of that year, the project was divided into 2 × 1.5 meters (0.964 acres) and 2 × 3 meters (1.085 acres) of two kinds of density graft grafting, and completed the task of building a garden. The second year there is a result; the third year (1978) 2 × 1.5 m garden yield 689.4 kg per mu; 1980 is the fifth year to build a park, according to September chestnut growing survey, 2 × 1.5 m Park Of the 210 plants, the average dry 2.96 meters high, dry coarse 7.46 cm, 2.44 meters in diameter, leaf area coefficient of 4.41, average per plant