The antifreeze of citrus should be based on prevention. First of all, it is necessary to solve the problem of good local conditions, choose a suitable ecological garden, select varieties with strong cold resistance, and establish large-scale citrus gardens with good protective forests. body. Based on this work, we will do the following cold and antifreeze work in the following year:
1. Apply basal fertilizer to prevent post-harvest deciduous fertilization. Apart from proper application of N, P, and K, pay attention to the application of fertilizers such as Ca, Mg, Zn, and B. Organic manure should be used more for fertilizer types, and organic N fertilizer applied at least annually should account for 30% of the total annual N amount. Fertilizer on heavy heavy fertilizer for the summer (from late June to early July application), the annual 40% to 50% of the N fertilizer, 60% to 70% P, K fertilizer, 100% organic fertilizer In the summer. Before and after fruit harvesting, the fruit fertilizer was applied one week before and after, and the fertilizer accounted for 30% of the whole year. It was used as compound fertilizer, or applied grass ash, organic livestock and poultry fertilizer, cake fertilizer, coke soil, green manure and other hot fertilizers. Spray 0.3% to 0.5% urea plus 0.3% potassium dihydrogen phosphate immediately after harvest.
2. Timely fruit picking in batches According to the maturity of the fruit, it can be harvested in 2 to 3 batches, especially in the Dainian. It should be harvested in batches to prevent the physiological water shortage caused by the one-time harvesting, resulting in leaf defoliation and low resistance. Cold ability.
3. Irrigation and Conditioning Citrus Orchards can be irrigated (or poured) 2 to 3 days before the onset of frost, and the microclimate of the orchard can be adjusted by utilizing the characteristic of large specific heat of water, and the soil temperature can be reduced to reduce the depth of frozen soil and increase the air humidity of the orchard. In order to reduce the effect of freezing.
4. Soil, grass cover cream before the use of inner trench soil, ladder wall soil or earth soil 15 ~ 20cm thick cover the roots and stems, can increase the ground temperature 2.5 ~ 5 °C. The ground covers grass, sawdust, and other dead objects or uses the winter grass growing in the park to cover the ground, which has the effect of reducing the temperature of white leeches and increasing the temperature at night. The juvenile tree can be erected on a tripod and covered with straw to increase the temperature by 2°C. After the seedlings are covered with a layer of straw, they are covered with a layer of film to form an arch, or the top cover is covered with wind around the straw.
5. Burning smoke stack This is a good measure of antifreeze. On frosty nights, put 5 to 6 cigarettes per 667 square meters of parkland, which will produce smoke in the evening and inhibit radiation countercurrent and prevent frost.
6. Spraying the steam suppressing and insulating agent Before the low temperature arrives, spraying the steam suppressing and insulating agent on the citrus canopy can inhibit the water transpiration of the leaves, reduce the heat loss of the tree body, and reduce the loss of frost damage.
7. The trunk is coated with white or coated white trunk is mainly the use of white lime reflective effect, reduce the sunny endothermic, narrow the temperature difference between day and night, to prevent the frozen skin, and control pests. The whitening agent is generally formulated in the proportion of quicklime 10kg, sulfur powder 1kg, salt 0.2kg, and water 30-40kg, and the trunk stem is evenly painted on a sunny day. Some orange farmers use straw to wrap up the trunk and also have a certain amount of cold and antifreeze effects.
In addition, it is necessary to remove the premature late autumn shoots as soon as possible, and it is forbidden to spray lime sulfur compounds, pineine mixture, expand soils, deepen the soil, and cut large branches under frosty weather or long-term dry climate conditions.
1. Apply basal fertilizer to prevent post-harvest deciduous fertilization. Apart from proper application of N, P, and K, pay attention to the application of fertilizers such as Ca, Mg, Zn, and B. Organic manure should be used more for fertilizer types, and organic N fertilizer applied at least annually should account for 30% of the total annual N amount. Fertilizer on heavy heavy fertilizer for the summer (from late June to early July application), the annual 40% to 50% of the N fertilizer, 60% to 70% P, K fertilizer, 100% organic fertilizer In the summer. Before and after fruit harvesting, the fruit fertilizer was applied one week before and after, and the fertilizer accounted for 30% of the whole year. It was used as compound fertilizer, or applied grass ash, organic livestock and poultry fertilizer, cake fertilizer, coke soil, green manure and other hot fertilizers. Spray 0.3% to 0.5% urea plus 0.3% potassium dihydrogen phosphate immediately after harvest.
2. Timely fruit picking in batches According to the maturity of the fruit, it can be harvested in 2 to 3 batches, especially in the Dainian. It should be harvested in batches to prevent the physiological water shortage caused by the one-time harvesting, resulting in leaf defoliation and low resistance. Cold ability.
3. Irrigation and Conditioning Citrus Orchards can be irrigated (or poured) 2 to 3 days before the onset of frost, and the microclimate of the orchard can be adjusted by utilizing the characteristic of large specific heat of water, and the soil temperature can be reduced to reduce the depth of frozen soil and increase the air humidity of the orchard. In order to reduce the effect of freezing.
4. Soil, grass cover cream before the use of inner trench soil, ladder wall soil or earth soil 15 ~ 20cm thick cover the roots and stems, can increase the ground temperature 2.5 ~ 5 °C. The ground covers grass, sawdust, and other dead objects or uses the winter grass growing in the park to cover the ground, which has the effect of reducing the temperature of white leeches and increasing the temperature at night. The juvenile tree can be erected on a tripod and covered with straw to increase the temperature by 2°C. After the seedlings are covered with a layer of straw, they are covered with a layer of film to form an arch, or the top cover is covered with wind around the straw.
5. Burning smoke stack This is a good measure of antifreeze. On frosty nights, put 5 to 6 cigarettes per 667 square meters of parkland, which will produce smoke in the evening and inhibit radiation countercurrent and prevent frost.
6. Spraying the steam suppressing and insulating agent Before the low temperature arrives, spraying the steam suppressing and insulating agent on the citrus canopy can inhibit the water transpiration of the leaves, reduce the heat loss of the tree body, and reduce the loss of frost damage.
7. The trunk is coated with white or coated white trunk is mainly the use of white lime reflective effect, reduce the sunny endothermic, narrow the temperature difference between day and night, to prevent the frozen skin, and control pests. The whitening agent is generally formulated in the proportion of quicklime 10kg, sulfur powder 1kg, salt 0.2kg, and water 30-40kg, and the trunk stem is evenly painted on a sunny day. Some orange farmers use straw to wrap up the trunk and also have a certain amount of cold and antifreeze effects.
In addition, it is necessary to remove the premature late autumn shoots as soon as possible, and it is forbidden to spray lime sulfur compounds, pineine mixture, expand soils, deepen the soil, and cut large branches under frosty weather or long-term dry climate conditions.