Yes! !

Propagation method

First use seed propagation to cultivate rootstock seedlings, and then use grafting to propagate. When longan matures from July to August, choose a mother tree with strong adaptability, easy growth, and few pests and diseases for seed collection. The seeds will easily lose their germination ability. Sowing seeds immediately after harvesting can increase the germination rate of the seeds. Use on-demand or drill sowing, sow in furrows with a row spacing of 20cm, and sow about 750kg of seed per 1hm2. After sowing, the soil should always be kept moist. When the height of the seedlings exceeds 25cm, remove the tops to promote the thickening of the trunk. Cut off the base branches at any time to keep the trunk 10-17cm above the ground smooth and upright. Use grafting operations. After 1-2 years The cultivated rootstock seedlings can be grafted.

Spring grafting is from April to June, and autumn grafting is from September to October. The scion should be selected from an identified and excellent mother tree. The grafting method uses bud patch grafting or tongue grafting. It can be planted in both spring and autumn, and is mostly planted in rectangular or square shapes. The spacing between planting rows is generally 4m, and about 2,600 plants per 1hm is appropriate. [2]

Field management

Management of young trees should focus on intercropping and mulching, hole expansion and soil improvement, timely fertilization, and reasonable shaping and pruning to form a good tree shape and cultivate strong trees. Backbone branches. For mature trees, emphasis is placed on adding fertilizers, cultivating soil, cultivating, draining, and pruning. [2]

Cultivation of strong flower spikes

(1) Promote the germination and growth of flower buds on time. In normal years, longan begins to sprout flower buds from late January to early February, which is one of the key technical measures to promote longan flowering. Specific measures are:

Control winter shoots not excessively; irrigate in case of drought; lightly apply water fertilizer and spray foliar fertilizer; spray compound fine elements, and spray before and after the Spring Festival to promote germination.

(2) Eliminate the influence of small leaves on the formation of flower spikes. If small red leaves appear during the growth and development period of the flower spike, remove them manually in time or use 100-150ppm ethephon to remove the small leaves.

(3) If the flower spike stops growing due to factors such as drought or freezing during the growth and development period, it is necessary to promptly use irrigation, fertilization and other methods to promote the growth and development of the flower spike.

(4) Spray "Longan High Yield Factor" once when the flower spike grows to 20-25 cm and the flower spike is budding to cultivate short and strong flower spikes and increase the ratio of female flowers.

Pollination and fertilization

The main methods are: releasing bees and artificial assisted pollination; when it rains during the flowering period, shake the tree in time to prevent "retting"; when there is drought during the flowering period, timely soil irrigation and leaf surface Spray water to moisturize to ensure normal pollination and fertilization.

Fertilization

Flower-strengthening fertilizer: For the first time from late February to early March, when the flower spike grows to 10-12 cm, it is calculated based on the plant yield of 25 kg of fruit. Apply per plant. 0.2 kg of potassium sulfate, 0.2 kg of dry cake fertilizer and decomposed dilute water fertilizer. If it is a strong and vigorous tree and there is no sign of fertilizer deficiency, you do not need to apply fertilizer this time: the second time, apply it before the flowering period when the pure flower spikes have completed differentiation, most of the flower buds are full, and the flower spikes will no longer be in danger of "shooting" ( In normal years, it is from late March to early April), and most organic fertilizers are applied during this period. Based on a plant yield of 25 kilograms, apply 1.5 kilograms of cake fertilizer or 5 kilograms of chicken manure, 0.4 kilograms of potassium sulfate, 0.5 kilograms of calcium phosphate fertilizer, and 0.1 kilograms of urea per plant.

Fertilizer for strong fruit: Apply fertilizer from mid-May to early June, when the first physiological fruit drop ends and before the second physiological fruit drop begins (that is, when the small fruit is about the size of a soybean). The fertilizer this time depends on whether there are fruits and how many fruits there are. Based on a plant yield of 25 kilograms, apply 1 kilogram of compound fertilizer, 0.3 kilogram of potassium sulfate, 0.3 kilogram of urea, and 0.25 kilogram of calcium phosphate fertilizer per plant.

Top dressing outside the roots:

① During the 40 days from early February to early March, compound nucleotides plus potassium dihydrogen phosphate and boron are usually sprayed.

② From May to June, spray foliar fertilizer every 15-20 days, using potassium dihydrogen phosphate, magnesium sulfate, zinc sulfate, and spray with water.

Drainage and Irrigation Water

During the fruit development period, there is too much rain. Pay attention to timely removal of accumulated water. In case of drought, timely irrigation and moisturizing are needed to ensure normal fruit development.

Flower and fruit thinning

Flowers are generally thinned in mid-March when the flower spikes have just completed their development and before flowering; in late May to early June, when the small fruits develop to the size of soybeans, thinning is carried out. fruit. The specific methods and requirements are:

(1) Remove diseased spikes, weak spikes and poorly growing flower spikes, retain the robust flower spikes, reduce unnecessary nutrient consumption, and increase the fruit setting rate;

(2) The top of the crown should be sparse, and the middle and lower parts should be less sparse to prevent too many fruits from hanging on the top of the crown, causing direct sunlight to the trunk in summer and weakening the tree's vigor;

(3) Remove the outside Leave it inside, remove the main part and keep the deputy part, fold it and leave it on. That is to say, thin out the flowers and fruit spikes on the outside of the crown, and keep more flowers and fruits on the inside of the crown. When there are two or more spikes on the same base branch, thin out the main flower spike and leave the auxiliary flower spike, or thin out the upper part of the flower spike. Long flower spikes, retaining short strong spikes at the lower part.

(4) Fruit thinning should be done by thinning out the ears with few fruits and retaining the ears with many and compact fruits. However, if there are too many fruits per ear, some side ears should be thinned out appropriately and the number of single ears should be appropriately reduced. The amount of fruit hanging on the ear.

Question

What medicine is best to control and preserve fruit