试验于1970年杂交,1971年播种,包括11个杂交组合的514个杂种。少数杂种实生苗在3年生时便开始结果,大多数在4、5年。八云×杭青组合的杂种4年生结果树达70％,平均始果年龄为4.33年。以结果早的品种为杂交亲本,可以产生早结果的后代,结果晚的亲本的后代结果也晚。例如严州雪×消梨的杂种,在6年生时才有50％植株结果,平均始果年龄 The experiment was crossed in 1970 and sown in 1971, including 514 hybrids of 11 cross combinations. The few hybrid seedlings start producing results at 3 years of age, mostly in 4 or 5 years. Eight clouds × Hangqing combination of hybrid 4-year-old tree results up to 70%, the average fruit age of 4.33 years. The result of the early varieties of hybrid parents, can produce descendants of early results, as a result late offspring of late parents also late results. For example, the hybrid Yan Yan × pears, pears at 6 years only 50% of the plant results, the average fruit age