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目前,果园中相当大的一部分老品种需更新改造;而一段时间推行的矮化密植栽培又使果树的经济寿命缩短,造成果园的更新换代速度加快。另一方面目前农村又不可能再占用大面积粮田建设果园,绝大部分是老园改建新园,重茬果园不可避免。 果园重茬连作往往会出现“重茬病”。重茬病又称果树忌地残毒或叫连作障害。据有关资料报道.许多果树都有忌地问题,仅表现程度不同。如桃、苹果、葡萄、
At present, a considerable part of the old varieties of orchards need to be updated and rebuilt; and some time the implementation of dwarf and dense planting also shortened the economic life of fruit trees, resulting in faster orchard replacement. On the other hand, it is impossible for rural areas to occupy a large area of orchards for the construction of orchards at the moment. Most of them are rebuilding old gardens and rebuilding orchards are inevitable. Continuous cropping orchard often appear “heavy stubble disease.” Heavy stubble disease, also known as fruit trees bogey residual poison or even as a barrier. According to the information reported, many fruit trees have problems of avoidance and only show different degrees. Such as peach, apple, grape,