Jujube management techniques in early spring
Strengthen the management of the germination period
top dressing. Apply sprouting fertilizer. The sprouting fertilizer is mainly nitrogen fertilizer, and appropriate amounts of phosphorus and potassium fertilizers are applied. The amount of fertilizer used this time accounts for 30% of the annual fertilizer amount. Generally, a jujube tree should be applied with half a catty of urea, 1.5 catties of superphosphate, and a load of human and animal manure. If the amount of fruit is too large or small, the amount of fertilizer should be appropriately increased or decreased. Fertilization method: Dig nests or trenches under the canopy. Diligently apply root and external fertilizer. Spray 0.2% boron fertilizer once on the canopy during the flowering and leafing period, and spray 0.3% potassium dihydrogen phosphate plus 0.4% urea 3~4 times during the fruit stabilization and shoot period, with an interval of 5~7 days. Supplement inadequate nutrition.
Spray water reasonably. During the flowering period of the jujube tree, when the temperature is dry, spray clear water in the morning and evening to ensure the flowering and pollination of the jujube tree and increase the fruit setting rate.
Do a good job in soil management
One is to fully cultivate and loosen the soil in winter if there is no cultivating or not thoroughly digging the ground, so as to improve fruit setting; the second is to open trenches and build "tile-back" boxes or make tree trays to thicken the loam layer of the roots; It is a straw covering the tree tray. Straw mulching can not only keep moisture, increase temperature, but also increase fertilizer.
Do a good job in branch management
Re-pruning before flowering is an effective measure to reduce nutrient consumption of jujube trees and increase fruit setting rate. Therefore, jujube trees that have not been pruned in winter or that have not been pruned thoroughly should continue to be pruned or supplemented. At the same time, do a good job in the management of spring branches of jujube trees such as promoting, pulling, controlling and hanging. Do a good job of wiping jujube heads. The reproductive growth and vegetative growth of jujube trees are synchronized. Wiping jujube heads is to control reproductive growth, promote vegetative growth, and improve fruit setting.
Do a good job in spring pest control
Spring is the budding period of jujube trees. At this stage, jujube trees mainly include jujube step, jujube armyworm, jujube gall midge, red spider, jujube leaf tick, tortoise bug, jujube flies, anthracnose, black rot , Brown spot disease and other pests. The following measures can be taken for the prevention and control of these diseases and insect pests: spray 3~5 Baume lime sulfur mixture before germination to prevent red spiders, tortoise scales, anthracnose, black rot, brown spots, etc., remove overwintering pathogens, and reduce initial invasion Source of contamination; use black light to trap and kill adult jujube armyworms; spray on the ground and shake the tree in the early morning to make the frightened pests fall to death. When jujube buqu reaches 7.5 heads/100 shares or jujube tick reaches 0.5 heads/leaf, spray 5000 times 20% fenvalerate or 50% phoxim + 0.3% urea on the tree; Sprinkle phoxim granules in the tree trays within 1 meter and hoe them shallowly to kill the unearthed jujube gall midge, jujube bud weevil, etc.
Do a good job in the management of newly planted jujube trees
Loosen the soil and water. The loose soil is suitable for shallow pine, and each plant must be watered thoroughly while pine. The straw covers the tree tray, the width is more than 1 meter, and the thickness is 5-7 cm; the thickened soil layer builds the tree tray; strict control is unreasonable Between species. Interplanting corn, sweet potato and high-stalk crops is strictly prohibited.
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