多效素施于果树效果好１９８８年，辛集市东营果园首次在梨树上试用多效素，至１９９０年扩展到１４８０亩，１９９４年施用面积达８６０００亩。施用作物除梨树外，还扩大到苹果树等，并均获得明显效果，受到了果农的广泛欢迎。施用多效素浓度一般为２５０—３００倍液，... Effect of multiple effect applied to fruit trees 1988, Xinji City, Dongying Orchard trial for the first time in the pear on the multi-effect, to 1990 expanded to 1480 acres in 1994, an area of ​​86000 acres. In addition to the pear tree, the crops also expanded to apple trees, etc., and achieved remarkable results, which were widely welcomed by fruit growers. The concentration of pleiotrophin is generally 250-300 times, ...