Introduction performance of apricot plum variety dinosaur egg in Tianshui, Gansu Province

We introduced a new variety of apricot plum dinosaur egg seedlings from the Economic Forest Research and Development Center of the Chinese Academy of Forestry Sciences and planted them in the experimental garden in March of that year. As a result of the following year, the fourth year entered the full fruit period with high economic benefits. Now the introduction performance and cultivation techniques are introduced as follows.

The main results are as follows: (1) the economic characters of ① fruit are nearly round, vertical diameter 5.5-6.3cm, transverse diameter 5.6-6.6cm, average single fruit weight 120.0g, maximum single fruit weight 145.0g. The pericarp is yellowish red, the pulp is pink, the flesh is crisp, sticky core, less crude fiber, more fruit juice, sweet flavor, high quality, and the soluble solids content is 17.80%. Resistant to storage and transportation, it can be stored for 20 days at room temperature. The growth and fruiting habit of ② is strong, the tree posture is open, the germination rate is high, the branching ability is strong, the axillary buds are easy to germinate and the branches are strong. In the fourth year after planting, the tree height was 2.7m, the crown width was 2.8m × 2.5m, the stem perimeter was 25.4cm, the average shoot length was 130cm, and the germination rate was 90.6%. The fruit is dominated by short fruit branches, and the fruit setting rates of inflorescences and flowers are 90.2% and 43.1%, respectively. The fruit was produced in the second year after planting, and the fruiting plant rate was 92.7%. The average plant yield in the fourth year was 38.2kg, and the yield per 667m2 was 2101kg. There is no fruit drop before harvest, and the yield is high and stable. The phenological phase of ③ is in Qinzhou District, Tianshui City, with flower bud germination from March 28 to April 2, flowering from April 3 to 20, leaf bud germination from April 5 to 10, and leaf expansion from April 12 to 18. The fruit began to be colored in late August and matured in mid-September, belonging to a medium-mature variety. The deciduous period is in the middle of November. The stress resistance of ④ showed good adaptability in many experimental sites. The cold resistance is strong. In 2006, when apricot and plum were in full bloom, our district suffered moderate late frost, the temperature dropped to-2 ℃, the freezing rate of flowers was only 9.5%, and the tree growth was normal.

(2) the key points of cultivation techniques are that the self-pollination rate of dinosaur eggs is low, so it is necessary to configure pollination trees, and the suitable pollination varieties are Wei Wang and Wei Hou. Generally, the distance between planting rows is 4 m × 2 × 3 m, and 83 plants are planted per 667m2. The suitable tree shape is evacuation stratification. During pruning, the backbone branch of the young tree was cut short by 40-50cm, and the second bud under the cut of the main branch was a competitive branch, which should be removed if it did not change its head, and the other branches could be regarded as auxiliary branches to promote the development of medium and short branches from late May to late June. In the full fruit period, the tree is mainly thinning and slow release, cut as little as possible, avoid overpruning, and remove the overgrown branches, overdense branches and cross branches in all parts of the inner chamber and crown. At the same time, the branch is pulled from May to June or August to September every year, and the opening angle of the base angle of the main branch is generally 70 °80 °. The other branches with space are flattened as auxiliary branches, which extend uniaxially to control the growth potential and promote the formation of flower buds, which is conducive to early fruiting. This variety has a large fruit, which requires strict flower and fruit thinning in the big year, leaving a single fruit according to the 15-20cm spacing when fixing the fruit, and keeping flowers and fruits in the small year and adjusting the size of the fruit in the year. After entering the full fruit period, strengthen the management of fertilizer and water to prevent the tree from weakening.