三、萘乙酸(NAA)、萘乙酸钾盐(K—NAA)、萘乙酸钠盐(NP—NAA):具有促进生根和防止落果的作用,在苹果育苗中用500ppm萘乙酸速蘸法处理苹果营养系砧木,可使M_4砧发根率达50％,在苹果、梨等果树上常用10ppm药液喷洒来防止采前落果。 四、ABT生根粉:它是我国近年新研制出的一种高效、广谱性生根促进剂,能促进不定根的形成,缩短生根时间,提高苗木栽植成活率。ABT生根粉在木本植物上应用的有三种型号,一号生根粉用于难生根的插条上;二号生根粉用于一般苗木的扦插育苗 NAA, K-NAA, NP-NAA: It has the effect of promoting rooting and preventing the drop of fruit. In apple seedling, the apple Nutritional rootstocks, M_4 anvil can make hair rooting rate of 50%, commonly used in apple, pear and other fruit trees 10ppm spray to prevent fruit drop before harvest. ABT rooting powder: It is an efficient and broad-spectrum rooting accelerator developed in recent years in our country. It can promote the formation of adventitious roots, shorten the rooting time and improve the survival rate of seedlings. ABT rooting powder in woody plants have three types of applications, one rooting powder for hard rooting cuttings; rooting powder II for the general nursery stock cuttings