I. Climate impact
1. Rapid temperature changes in jujube trees in the late autumn and early winter, the base of the trunk 10 to 30 centimeters from the ground has not yet completely stopped growing, its organs and tissues have not completely entered a dormant state, are very sensitive to low temperatures, then suddenly cool down, there will be Frost damage is particularly harmful to young jujube trees.
2. The extreme cold temperature of winter cold jujube jujube injury is -28 °C, but the number of days around -25 °C more than 10 days can also cause frost damage, generally more than branches, dry frost damage, easily lead to the death of branches, resulting in incomplete tree Even the whole plant was frozen to death.
Second, preventive measures
1. Reasonable design Zaoyuan 1 jujube tree planting options in low groundwater, loose soil, well ventilated fertile soil. Soils with high groundwater level, soil viscous weight, and high salinity have poor root development and are prone to freezing damage.
2 Create protective forest belts and form small grids to improve the climate of Zaoyuan.
2. Cultivate strong tree vigor 1 Strengthen water and fertilizer management, strictly follow the principle of “pre-promotion and post-controlâ€, apply less nitrogen fertilizer in the autumn, stop watering as soon as possible, and pour enough water into the water on time.
2 Reasonably prune the tree body, especially to be pruned in summer, pick up the heart in time, and promote the growth of branches.
3 During the growing season, prevention and control of diseases and pests should be strengthened to increase tree vigor.
3. Spray auxin at the end of summer and autumn, spray 500 to 1000 times of new schistosomiasis on the new branch, or apply 0.03% to 0.1% of naphthylacetate at the base of the new branch, which can inhibit its growth and promote the maturity of new shoots.
4. The tree is overwintering to protect 1 main branch of tree trunk.
2 The base soil 30 to 40 cm, dressing 30 to 40 cm.
3 Laminate or cover the grass between the bases or rows to remove the snow from the trees.
Third, remedial measures
1. To intercept the frozen dead shoots, select the frozen part, cut the frozen dead stems, and clear the date garden in time.
2. Cultivation of new branches Young branches of frozen jujube trees have a large number of new branches. When sprouts just emerge, they are selected to retain 1 to 2 moths in different directions, and the excess moths are cut off.
3. Preserve the jujube head to choose the preserved jujube head to grow faster, when the growth head of jujube head naturally sags, remove the sagging part in time.
4. Control water and fertilizer After the fall, increase the application of phosphorus and potassium fertilizers, and apply 500-1000 grams of plant ash to each hole to control the irrigation. The irrigation volume should be reduced to half of normal irrigation and water should be stopped one month in advance. In the jujube farmyard, short-growing crops should be selected.
1. Rapid temperature changes in jujube trees in the late autumn and early winter, the base of the trunk 10 to 30 centimeters from the ground has not yet completely stopped growing, its organs and tissues have not completely entered a dormant state, are very sensitive to low temperatures, then suddenly cool down, there will be Frost damage is particularly harmful to young jujube trees.
2. The extreme cold temperature of winter cold jujube jujube injury is -28 °C, but the number of days around -25 °C more than 10 days can also cause frost damage, generally more than branches, dry frost damage, easily lead to the death of branches, resulting in incomplete tree Even the whole plant was frozen to death.
Second, preventive measures
1. Reasonable design Zaoyuan 1 jujube tree planting options in low groundwater, loose soil, well ventilated fertile soil. Soils with high groundwater level, soil viscous weight, and high salinity have poor root development and are prone to freezing damage.
2 Create protective forest belts and form small grids to improve the climate of Zaoyuan.
2. Cultivate strong tree vigor 1 Strengthen water and fertilizer management, strictly follow the principle of “pre-promotion and post-controlâ€, apply less nitrogen fertilizer in the autumn, stop watering as soon as possible, and pour enough water into the water on time.
2 Reasonably prune the tree body, especially to be pruned in summer, pick up the heart in time, and promote the growth of branches.
3 During the growing season, prevention and control of diseases and pests should be strengthened to increase tree vigor.
3. Spray auxin at the end of summer and autumn, spray 500 to 1000 times of new schistosomiasis on the new branch, or apply 0.03% to 0.1% of naphthylacetate at the base of the new branch, which can inhibit its growth and promote the maturity of new shoots.
4. The tree is overwintering to protect 1 main branch of tree trunk.
2 The base soil 30 to 40 cm, dressing 30 to 40 cm.
3 Laminate or cover the grass between the bases or rows to remove the snow from the trees.
Third, remedial measures
1. To intercept the frozen dead shoots, select the frozen part, cut the frozen dead stems, and clear the date garden in time.
2. Cultivation of new branches Young branches of frozen jujube trees have a large number of new branches. When sprouts just emerge, they are selected to retain 1 to 2 moths in different directions, and the excess moths are cut off.
3. Preserve the jujube head to choose the preserved jujube head to grow faster, when the growth head of jujube head naturally sags, remove the sagging part in time.
4. Control water and fertilizer After the fall, increase the application of phosphorus and potassium fertilizers, and apply 500-1000 grams of plant ash to each hole to control the irrigation. The irrigation volume should be reduced to half of normal irrigation and water should be stopped one month in advance. In the jujube farmyard, short-growing crops should be selected.
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