The flowering period of fruit trees coincides with the time when the temperature in early spring changes greatly and the cold current attacks more frequently. Because the tree is difficult to adapt to the sudden change in temperature, fruit trees such as apricot, apple, pear, and peach suffer various degrees of frost damage. After the frozen buds are peeled off, the stigmas are It is dark brown and has a direct impact on fruit setting, causing significant losses to the production of fruit trees. ?
First, grasp the critical low temperature of frost damage. After the budding of fruit trees, the cold resistance gradually decreased, and the critical cold temperatures during the flowering period of fruit trees were slightly different. For example, the low temperature limit of apple buds was approximately -2.8°C, the flowering period was -1.7°C, and the young fruit period was -1.1°C. , that is, frost damage. In the same flower, pistil does not tolerate hypothermia compared to stamens, such as stigma encountered -1.5 °C low temperature, which is subject to freezing injury. Generally, the age is large and the nutrition level is high, and the freezing injury is lighter. On the contrary, it is heavy. ?
Second, preventive measures?
1, choose a good garden. Generally low-lying, closed valleys tend to accumulate cold air and cause freezing damage. Trees are planted on hills, hills, slopes, and sunny slopes. The air is circulated and the chance of frost damage is low. ?
2. Using technology to avoid freezing injury
1 It has been proved by experts and proved by practice that the national "863 Plan" key promotion product "Tianda 2116" plant cell membrane stabilizer can effectively resist the damage of freezing stress and other adverse factors, and spray it once again before the flowering period to reach the goal of antifreeze. Resistive purpose. 2 Irrigation. Irrigation or sprinkling in the spring can significantly reduce the temperature and delay germination. After germination to irrigation before flowering 1-2 times, generally delayed flowering 2-3 days. In addition, irrigation or sprinkling before frost damage can increase the temperature of the ground and the temperature of the trees, which can prevent and reduce the damage caused by freezing. During sprinkler irrigation, 0.5% sucrose water is sprayed, the water is cold and freezes, heat energy is released, the tree temperature is slowly reduced, and the antifreeze effect is better. 3 dry white. It can delay budding and flowering for 3-5 days. The trunk is painted more than 1 meter high. The lower main branch is painted more than 30 centimeters. Whitening can not only prevent freezing, but also effectively prevent Sunburn, pests and diseases. 4 spray growth regulators. Naphthylacetate (250-500 mg/kg) solution was sprayed on the whole tree before germination to inhibit the sprouting of buds and postpone the delay of the flowering period by 5 days. 5 The use of alfalfa flower buds can also compensate for some of the production.
3, smoke smoke. For a slight frost damage above -2°C, there is a certain effect. If it is lower than -2°C, the control effect is not obvious. Smoke can be used as straw, weeds, fallen leaves and other flammable materials that can generate a lot of smoke.
Third, remedial measures?
1, spraying agent. After the fruit freezes, 1000 times "Tianda 2116" is sprayed every seven days to repair and remediate. ?
2, increase the fruit setting rate. The pollination of lighter flowers was carried out for 1-2 times. Spraying 0.6% sucrose water + 0.2-0.3% borax or spraying 0.2% molybdenum fertilizer had the effect of alleviating freezing injury and increasing fruit setting rate.
3. Strengthen comprehensive management. In severely frost-damaged years, fertilizers are applied before and after flowering, and special fertilizers such as fruit trees or potassium dihydrogen phosphate compound fertilizers are topdressed and sprayed with “Tianda 2116†to restore tree vigor and increase fruit setting rate and fruit weight. Make sure that the disaster year has a good harvest.
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