Recently, some readers called this newspaper to ask about the management techniques of winter jujube at leaf and flowering stages. The reporter interviewed Zhang Ligong, a senior agronomist, for scientific guidance for the majority of farmers.
Fertilizer before flowering
According to Zhang Ligong, jujube trees have buds, flower bud differentiation, flowering, and fruit set overlapping in several periods. They have long flowering periods and need more nutrients and are more concentrated. If nutrients are insufficient at this stage, the quality of flower buds and fruit set rate of jujube trees will be affected, directly affecting jujube The yield and quality. Therefore, it is very important to topdress before flowering. Phosphate fertilizer is the main fertilizer in this stage, followed by potassium fertilizer and supplemented with appropriate amount of nitrogen fertilizer. Because the waxy layer of winter jujube leaves is thick and the liquid is not easy to stick to, the farmer can add agricultural water quality optimizer--soft water pass 4000 times before each dispensing, to adjust pH, optimize water quality, improve adhesion, enhance Penetration, play a role in efficacy.
Technical support management
Too long time hanging to pick heart. Auxiliary branches are reserved and timely girdling of the resulting branches. Flowering bees during the flowering period ensure pollination and fertilization and increase the fruit setting rate. During drought and high temperature during flowering, spray water to cool down in the evening.
Chemical sit fruit
1. For Wangshu, the fruit grower can first gird the fruit after spraying, and for the young trees and the weak trees, the fruit should be sprayed and then girdled.
2, fruit set agent selection
1 spray 85% gibberellin: It can promote the pollen germination of jujube tree and stimulate the ovary enlargement. In general, the flowering period can only be used 1 to 2 times. The use of gibberellic acid is more frequent, and fruit set-up is more common, but shedding is also more frequent in young fruit. When young fruit develops into soybean grain size, the use of gibberellin will promote the secondary growth of the jujube crane and accelerate the shedding of young fruit.
2 Boron: Boron is known as the "reproductive element" and it promotes the germination of pollen tubes, which is beneficial to fruit set. Recommended formula: spraying 10 ~ 15 micrograms / ml gibberellic acid during flowering (each packet of 1 gram plus water 45 kilograms that is the three sprayer) + phenanthrene 800 times the mixture of 1 or 2 times, but also spray the import of boron from 1000 to 1500 times, It can significantly improve the fruit setting rate of jujube trees.
Pest Control
Jujube tree disease prevention and control focuses mainly on anthrax, date rust, fruit shrinking, charred leaf and spotted deciduous disease, etc. The insect pests are mainly Lluobium, red spider, peach borer, leaf roller moth and cotton aphid. Disease and insect pest control, according to the development of pests and diseases, select the corresponding agent, and pay close attention to timing control.
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