The latest course on management techniques and methods of walnut in spring

Spring is the period of walnut flower bud differentiation, and it is the most important link in a year when walnut is managed before germination. Grasping this link is one of the effective measures to ensure walnut sprouting, blooming and fruiting and high yield. So how to manage walnuts in spring? Let's get to know it with the editor.

1. Soil, fertilizer and water management

The first is soil, which is the basis of walnut growth. Strengthening soil management can be carried out by the combination of orchard clear ploughing, orchard grass growing and orchard intercropping. Then there is fertilization. The method of circular trenching is generally used for young trees less than 3 years, digging pits away from the trunk 30cm to fertilize, while for adult trees, it is best to use centralized fertilization to dig holes and dig four pits in the vertical direction of the crown. The amount of fertilizer application should also be controlled. In general, 5-15 kg of farm manure and 0.3-0.6 kg of urea are applied to each young tree, while 30-50 kg of farm fertilizer and 0.5-1 kg of urea can be applied to each fruiting tree of 3-5 years, and the amount of chemical fertilizer should increase with the increase of tree age. From March to April, before the walnut sprouting, Rain Water should be watered once to promote the growth of new branches when the climate is not dry. After transplanting, attention should be paid to watering to improve the survival rate.

2. Pruning

Spring pruning is usually 20-30 days before sprouting, when combined with pruning to collect scions for short-term storage, high grafting or breeding of walnut grafted seedlings will be carried out from the end of March to the end of April. It can balance the branch potential of the main branch and the fruiting branch group and promote the formation of flower buds; adjusting the angle and direction of the branches of the fruit tree can obviously improve the ventilation and light permeability, promote the formation of medium and short branches, reduce the baldness of the lower part of the branch, and increase the effective fruit position; for young trees, it is necessary to promote crown formation and make it hang fruit as soon as possible.

3. prevention and control of diseases and insect pests

In spring, walnut black spot, canker and rot should be prevented. Stone-sulfur mixture can be sprayed before sprouting. When the temperature rises above 18 degrees, the whole garden plant and ground should be sprayed with 3-5 Bomedo stone-sulfur mixture once, and then 0.3-0.5 Baomedu stone-sulfur mixture should be sprayed again in the leaf spreading period after germination. Spraying 0.3-0.5 Baomedo stone sulfur mixture after 7-10 intervals in orchards with serious black spot can effectively prevent and control black spot. The prevention and control methods of canker and rot should be scraped to the xylem, and then smeared with prevention and control agents.

4. Frost prevention

The temperature is unstable in spring, and cold in late spring will occur in many areas, which not only causes great frost damage to walnuts, but also dampens the enthusiasm of some fruit growers, so it is necessary to do a good job in prevention. One is to choose frost-resistant varieties, which have a delayed germination period of about a week than other varieties, which can effectively avoid frost. In addition, we should pay timely attention to the weather forecast. When the night temperature drops by 0-2 degrees, it is necessary to concentrate on smoking defense in the orchard. The smoke can be made of flammable materials that can produce a lot of smoke, such as crop straw, weeds, fallen leaves, corncob, etc., and can be dug on the spot. The grass is piled in the pit and covered with wet grass or wet soil, so that the amount of smoke is sufficient and lasts for a long time.

The above is the walnut spring management technology introduction, hope to help you, want to know more related knowledge, please follow us.