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在安徽砀山园艺场、北京大兴县常各庄、山东省果树研究所(分别为砂壤土,壤土及较粘重壤土)进行了土壤施用PP333对苹果生长影响的试验。结果表明,PP333对苹果生长有强烈的抑制作用。6～9年生的‘元帅’,施用当年即显示出抑制效果,施后第二年其抑制效果充分地显示出来,第三年仍有强烈的抑制效应。PP333的抑制作用主要表现在缩短营养枝及增加侧芽萌发。在砀山,土施1g/m~2(有效成分),延长梢很少有超过20cm的,而 5 cm以下的短枝则大大增加,占当年枝类总数的95％左右(对照为66.6％),第三年仍达90％(对照53％)。土壤施用 PP333其效果受土壤类型的影响很大。土壤粘性愈大,其抑制效果愈差。
The effects of soil application of PP333 on the growth of apple were tested in the hilly mountain horticultural field in Anhui Province, Changgezhuang in Daxing County, Beijing, and the Fruit Tree Research Institute in Shandong Province (sandy loam soil, loam soil and loamy clay soil, respectively). The results showed that PP333 had a strong inhibitory effect on apple growth. Marshal 6 ~ 9 years old, the year of administration showed inhibitory effect, the second year after administration of its inhibitory effect fully demonstrated the third year there is still a strong inhibitory effect. The inhibitory effect of PP333 mainly manifested in shortening the vegetative shoots and increasing the germination of lateral buds. In Dangshan, the extension of soil is 1g / m ~ 2 (active ingredient), the extension tip rarely exceeds 20cm, while the short branch below 5cm greatly increases, accounting for about 95% of the total number of branches of the same year (control is 66.6%) , The third year still reached 90% (control 53%). The effect of soil application of PP333 is strongly influenced by soil type. The greater the soil viscosity, the worse the inhibitory effect.