Second, seedless white grapes.
1, phenology
It germinates in Turpan, Xinjiang in early April, blooms in the middle and late May, and matures in late August. It takes about 140 days from germination to maturity. The required active accumulated temperature is about 3400℃. Strong drought resistance, poor disease resistance, easy to be infected with powdery mildew, white rot and black pox. 2. What are the main points of seedless white grape cultivation? Xinjiang has a long history of cultivation and many strains differentiation, so it is advisable to choose a high-yield type with large fruit grains and long oval fruit grains in production. Plants grow vigorously and are suitable for scaffolding shaping and pruning medium and long branches. Gibberellin treatment can increase fruit size. Seedless white is weak in disease resistance, so early prevention and control of diseases should be paid attention to in cultivation. Iii. Shandong climate 1. Shandong's climate belongs to warm temperate monsoon climate type. Precipitation is concentrated, rain and heat are in the same season, spring and autumn are short, winter and summer are long. The annual average temperature is 1 1℃- 14℃, and the regional difference of temperature in Shandong province is greater than that in the north and south. 2. The frost-free period of the whole year increases from the northeast coast to the southwest, with an average length of 65,438 0.80 days in northern Shandong and Jiaodong and 220 days in southwest Shandong. East Tianshan Province is rich in light resources, with the annual light hours of 2290-2890 hours, and the heat conditions can meet the needs of double cropping a year. The average annual precipitation is generally between 550-950 mm, decreasing from southeast to northwest. 3. The seasonal distribution of precipitation is very uneven. 60%-70% of the annual precipitation is concentrated in summer, prone to waterlogging, and prone to drought in winter, spring and late autumn, which has the greatest impact on agricultural production.