How big is the Pingguo tree suitable for autumn sowing in Shenyang?

Apple trees in Shenyang are suitable for planting in autumn, which belongs to temperate semi-humid continental climate. The precipitation is concentrated in summer, with large temperature difference and four distinct seasons.

Apple trees can adapt to most climates. It is the best choice for apple growth between 35-50 degrees north and south latitude. Apples need 1000- 1600 units of heat and 120- 180 days of frost-free weather. Warm during the day and cold at night, and as much light radiation as possible is the premise to ensure good quality. Apples can resist the frost of MINUS 40℃, and if the temperature is between -2.2℃ and -3.3℃ during flowering and fruiting, it will affect the yield. Apples bloom late. Thereby reducing the probability of suffering from frost.

Orchards that did not apply base fertilizer in autumn and winter last year should be applied immediately after thawing (but the effect is not as good as that in autumn). After fertilization, if there are irrigation conditions, water should be poured into the garden once, and shallow hoeing should be done in time to preserve moisture. Dry land orchards should be raked to conserve moisture, then fertilized, and then quickly leveled and patted to conserve moisture. Young and weak trees will be covered with "banded" films to increase temperature and keep moisture, thus promoting the robust growth of trees. The fertilization method is to dig a "ring ditch" or "well ditch" with a width of 50 cm and a depth of 50 cm under the crown projection, and apply all the base fertilizers prepared in autumn and mix them evenly with the soil; Then sprinkle all the spring spices in the tree tray.

In general, the buds of the middle and back branches of apple varieties are not easy to germinate, especially the slow-release branches are often "bare-legged branches". In order to promote the sprouting of branches and reduce bare legs, a sharp knife or a small saw blade should be used to damage the xylem 1/4- 1/3 at the position that needs sprouting (central main branch) or in front (oblique main branch and auxiliary branch) from the end of March to the beginning of April. Then, remove the competition (branches), buds and buds on the back of the central main branch and the auxiliary branch to avoid sprouting and branching, wasting nutrition and disturbing the tree shape.

Early bud thinning of apple trees can save nutrition, help to bear large fruits and promote fruit accumulation. At the same time, strengthen the tree potential, promote the growth of spring shoots and make up for the lack of pruning in winter. It can save working hours, improve efficiency and reduce costs. In normal climate, the technology of "bearing fruit with flowers" can be popularized. That is to say, in the middle and late April, the inflorescence is exposed until the inflorescence is separated (the central flower appears bud), and the two sides and lower part of the mother branch are mainly selected according to the flower cluster spacing of 20-28 cm, except the central flower and 1 lateral flower, all the redundant flowers are thinned out.

Chemical control should be done in three stages, namely, spraying drugs in time after flowering (half a month before onset), before rainy season and before rainy season. Spraying 1: 3: 200 lime Bordeaux mixture+Guaguozhuangdiling in the early stage of growth, and spraying in the later stage.