枣品种枣股有效结果年龄与丰产性的关系

根据枣股的有效结果年龄,把调查的125份枣品种分为4个类型:1～3龄枝结果为主;2～9龄枝结果为主;1～9龄枝结果为主和2～6龄枝结果为主,它们分别形成各类品种产量的85%以上。“1～3”型品种早果性强,早丰性好.但成龄树立体结果能力极差;“2～9”型品种早果性差,但开始结果后产量上升快丰产稳产:“1～9”型品种多数为小果型品种,虽早果性强,但早丰性差,盛果期树立体结果能力强;“2～6”型品种早果性较差,并有不同程度的大小年现象。

The Relation between Bearing Capacity of Mother Spur of Jujube and Ability to Set Heavy Fruits

According to the continued bearing capacity of Mother spur of jujube,125 Chinese jujube varieties were classified into four types,iefruits were produced on 13 years old branches,1～9 years old branches,2～9 years old branches and 2～6 years old branches,those take 85% yield of all vari- eties.The“1～3”type posssses tne properties of early bearing and high early produotivity,but the stere- o-bearing ability of grown-up tree is much less.The yield of young trees in“2～9”type is low,and af- ter its first bearing the yield increases very quickly and stably.Most of“1～9”types are small fruit varieties,the output of young trees which are early-bearing is low,however,the grown-up trees pos- sesses strong stereo-bearing capacity.The“2～6”types is with less early-bearing ability,and alternate of bearing also occurs sometimes.