在高密度果园,利用控制树冠大小的苹果营养系砧木带来了很多好处。可以设想、在高密度种植设计中,如果光照、水分及营养物质的竞争,不明显地降低单株产量,那么必将增加每公顷的产量。由于半矮化及矮化苹果砧降低营养生长及树冠大小,因而密植较实生砧更为优越。Westwood等(1976)指出,最高产量决定于适宜的株距,这是 In high-density orchards, the use of rootstocks that control the size of the crown of apple trees has brought many benefits. It is conceivable that in high-density plantation designs, if the competition of light, moisture and nutrients does not significantly reduce the yield per plant, it is bound to increase the yield per hectare. Semi-dwarfing and dwarfing apple anvil reduce vegetative growth and canopy size, resulting in better density than the anvil. Westwood et al. (1976) pointed out that the highest yield depends on the appropriate plant spacing, which is