桃树自根树的生产效应分析

EVALUATION ON PRODUCTION EFFECTIVITY OF SELF-ROOTED PEACH TREES

8年研究表明:桃自根树根系分布浅,细根多,早期根的贮藏营养水平高,树体较矮小,因此,早期产量比嫁接树高20.9％,达显著水平,进入盛果期后,根系、树体及产量与嫁接树的差异逐渐消失。自根树生长较弱,抗涝性较差,但树冠内膛光禿的速度较慢。叶分析结果表明:自根树与嫁接树相比氮、磷、钾含量相似,钙的含量较高,锌的含量较低。

Characteristics of growth and fruitfulness of peach trees propagated by cutting or grafting were investigated for 8 years to evaluate their production effectivity. It was found that the self-rooted trees, as compared with the grafted ones, had smalIer tree size, more fibrous root system tending to grow in the shallow soil, but a higher level of nutrient reserve in their roots. These properties brought the tree to produce approximate 20 percent more yield in thcir early production, However, the differences between two tree types lost gradually, as they came into the stage of full production. Those from cutting were also in lower vigor of growth, lesser tolerant to watcrlogging, but became bald from fruiting wood later in their inncr part of low limbs. In leaf analyses, little differences of N. P. K in content were found between two types of propagations, but higher Calsium and lower Zinc contents in self-rooted trees.