Studies on the dwarfing cultivation of peach tree

1. 矮化砧木上的桃树需要相应的抚育和新枝修剪。在一个中央领导系统中，最重要的修剪可能是在第一年从主茎侧面剪掉新芽。在扦插的刺激下，出现了次生芽。如果处理得当，第二年每棵树产量8公斤，第三年每棵树产量2.6吨，达到了3米高的目标。在砾石栽培中，开花后的桃树根部对矿质营养物质的吸收非常不活跃，但在冬季，毛毡桃树根部的矿质营养物质含量高于桃树根部。砂培阶段给予RPP更多的养分，新芽更加旺盛，果实生长得到促进。果实成熟延迟，含糖量下降。另一方面，当RPP在成熟早期给予较少的营养物质时，果实成熟早，含糖量增加。在实际种植中，应在早期给予足够的养分，在成熟期减少土壤养分。“三洋水光”的涩味程度与果实中总酚含量呈正相关。在经常出现涩味的品种中，毛蕊花和日本花上的果实所含的酚含量高于桃上的果实。在果实生长的第三阶段，剥皮、干旱和低温使酚含量增加。以粳稻和毛蕊花作为桃的砧木，似乎会出现再植失败的问题。

1. Peach trees on Prunus tomentosa (dwarfing rootstock) require relevant tending and triming of new shoots. The most important triming in a central leader system might be cutting (cutting back) new shoots appeared laterally from the main stem in the first year. Secondary shoots appeared by the stimulation of the cutting. When this treatment was made properly, the trees yielded 8kg/tree in the second year and 2.6ton/10are in the third year when they attained a target figure of 3m tall.2. The root of peach trees on P.tomentosa(RPP) contained more mineral nutrinets in winter than those on P.persica, but the absorption of nutrients in RPP was very inactive after blooming atage in a gravel culture. When RPP was provided more nutrients at the stage in a sand culture, new shoots became more vigorous and the fruit growth was promoted. However, fruit maturation delayed and the sugar content declined. On the other hand, when RPP was given less nutrients from the early stage of maturing, the fruits matured early and their sugar contents increased. In practical growing, it is necessary to give enough nutirients at the early stage and to reduce soil nutrients at the maturing stage.3. In case of 'Sanyo Suimitsu' the degree of astringency correlated positively with total phenol content in the fruit. The cultivars in which astringency tends to appear often, the fruits from trees on P.tomentosa and on P.japonica contained more phenol than that from trees on P.persica. Phenol content increased by girdring, drought and low femperatures at the third stage of fruit growth.4. It seems that the problem of replant failure occurs when P.japonica and P.tomentosa are used as rootstocks for peach.