The northern margin of the province, which is economically cultivated in our province, often faces the problem of winter frost damage in winter and should be prevented.
Science Park
(1) Scientific layout and reasonable planning. Due to the limitation of weather conditions, the province cannot plant a large area for development. In the southern part of Jiangsu Province, especially the cities of Su, Wuxi and Changzhou, areas where there is already cultivation of alfalfa are the key areas for planting; in the areas along the river and along the lake, there are large bodies of water that regulate the temperature and can also be planted in key areas; In areas where the northern part of northern Jiangsu Province is cultivated, it is advisable to choose suitable places where the microclimate is better, and it is not appropriate to plant large areas. (2) Make full use of the microclimate and plant it properly. Tribulus terrestris is an evergreen subtropical plant. The annual average temperature of the planting area is required to be greater than 15°C. The average temperature in January is above 5°C and the minimum temperature is above -5°C. When setting up a park in a northerly region, it is better to choose a site with a better microclimate. The suns, lakes, and rivers in the east or south direction are suitable. The cold air that is easy to be deposited, such as flat land and low-lying land, should not be planted. In the southern part of the southern Jiangsu Province, the Pingyuan Garden reconstructed from a paddy field should be built with higher standards, such as the establishment of a high-dwarf tree planting shelterbelt, high-specification planting (macro aquifers, large fertilizers, shallow pits, shallow plantings), and proper close planting. Areas where conditions permit can be cultivated using facilities to avoid freezing, and at the same time, to mention the morning market.
The types of late-flowering varieties with strong cold-resistance ability, such as Guanyu and Qingcao, are now widely promoted. (1) Guan Yu. The fruit is oblate, with a single fruit weight of 43.3 to 61.5 grams; the fruit surface is milky or milky yellow, and the skin is of medium thickness and easy to peel; the flesh is 0.8 to 1 cm thick, white or milky white; the meat is fine and soluble, sweet and sweet, slightly fragrant; There are 3 to 5 seeds; the fruit is resistant to storage and transportation, and it is more prolific. The mature period is from the end of May to the beginning of June. (2) Green species. The fruit is spherical, with an average fruit weight of 33 grams; the fruit surface is light orange and yellow, and the skin is thin and easy to peel; the flesh is orange and yellow, with fine and soluble meat, juicy juice, strong flavor, sweet and sour taste, superior quality; large seeds, 2 to 4 capsules; mature period is late May, strong tree vigor, high yield, resistant to storage and transportation.
Strengthen management to improve cold resistance Early basal fertilizer, increase nutrient reserve before wintering of trees, timely sparse fruit and fruit, reduce nutrient depletion; apply fertilizers outside roots and supplement nutrients; water before rooting in winter, delay flowering; Form a tree shape to retain the branches of the lower part, the inner part and the south part, apply the special antifreeze agent for fruit trees, and adopt the trunk whitening, timely snow shake, tree cover film and sunshade net frost protection for bad weather such as heavy snow, strong wind, etc. Antifreeze measures, etc.
Post-disaster remedial measures (1) Reasonable pruning. For the frozen eucalyptus trees, after the temperature has risen steadily, measures have been taken to pick up leaves, maimed pruning, and saw dry. (2) Strengthen fertilizer and water management. After the temperature has risen steadily, the park can be cultivated by cultivating soil and promote root recovery. Before the budding, the spring budding fertilizer was applied in a timely manner. Nitrogen fertilizer was used as the main fertilizer. The adult tree strain applies 50 kilograms of manure water, and can also be irrigated with an appropriate amount of 0.1% to 0.2% urea aqueous solution; the amount of fertilizer applied to young trees is reduced, and 0.2% to 0.3% of urea and 0.2% to 0.3% of potassium dihydrogen phosphate can be sprayed. The mixture. Freeze damage occurred in the more serious plants, stop the application of pre-fertilizer, until the shoots sprouted after fertilization, mainly nitrogen fertilizer. (3) timely control of pests and diseases. Before the sprout, the whole park sprayed lime sulfur to prevent and treat pests and diseases to prevent the occurrence of diseases and insect pests due to declining tree vigor. (4) Appropriately control the amount of flowers and fruit. Freezing damage to lighter eucalyptus trees can control the amount of the results in one-half to two-thirds of the normal years; eucalyptus, which has 30% or more of the number of fallen leaves and frozen branches and shoots at the age of 1 to 2 years, must be strictly fruit thinned. Promote tree-trend recovery. The fruit thinning time should be sooner rather than later.
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