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农谚说:“桐大不如桐二,桐二不如桐三,桐老三,撑破天。”它肯定了泡桐平茬后能长出高大主干。但平茬后泡桐的当年高、径生长量能否赶上同一条件下未平茬泡桐的总生长量,则是一个值得探讨的问题。为此,1983年我们在杨陵区五泉公社毕公大队进行了泡桐平茬与未平茬的对比试验。一、试验方法试验区设在毕公大队三队毛泡桐×白花泡桐无性系一年生留床苗圃地,面积4460米~2,肥力中等,有灌溉条件。试验苗木共615株,株行距为2×2米。采用平茬与不平茬两种处理,完全随机区组排列,6个小区,3次重复,每小区有苗98～106株。试
Agricultural proverb said: “Tong Tong as Tong II, Tong two inferior to Tong three, Tong old three, hold the sky.” It affirmed the Paulownia stubble can grow tall trunk. However, after the stubble Paulownia high, diameter growth can catch up with the same conditions, the total growth of unplanted Paulownia, it is a question worth exploring. To this end, in 1983 we Gongliu Commune Grades Brigade Yangling Paulownia stubble and unplanted contrast test. First, the test method Test area is located in the Bi brigade three teams of Paulownia × White Paulownia clonal annual bed nursery, an area of 4460 m ~ 2, medium fertility, irrigation conditions. A total of 615 seedlings tested, spacing of 2 × 2 meters. Using stubble and stubble two kinds of treatment, completely randomized block arrangement, 6 plots, 3 replicates, each plot has 98 to 106 strains. test