1. Preserving leaves is the basis for fruit production, and multi-leaf can be more fruitful. A very important part of the pomelo cultivation and management is to ensure that as many healthy green leaves as possible are obtained in order to obtain high-quality fruit in successive years. Unusually green leaves and abnormal leaves all seriously affect tree vigor, yield and quality.
Whether or not green leaves can turn green reflects whether the formation of chlorophyll is good. Light, temperature, moisture, and nutrients all affect the green color of pomelo leaves. Roots and soil conditions affect nutrient uptake and supply, and have a great impact on leaf greening. Light is a necessary condition for the formation of chlorophyll. However, excessive light has a destructive effect on the accumulation of chlorophyll. Practice has proved that the new leaves of honey pomelo have the fastest conversion to green in the absence of strong sunlight, low evaporation, moist soil, and suitable soil temperature for root groups. However, under strong sunlight, the new leaves can turn green if they can ensure normal absorption of water and nutrients. The long-term accumulation of water, the root absorption function is reduced, and the leaves often show a lack of various elemental symptoms. An orchard that is easy to accumulate in spring and summer but easy to dry in autumn and winter is easy to make a lot of fallen leaves. The low temperature also affects the normal turning of the leaves to green. In case of cold wind, late autumn shoots and winter shoots are more likely to show green turning. The lack of some element necessary for the formation of chlorophyll in the soil also affects the turning of the leaves.
Pomelo leaves fall out after 17 to 24 months. About half (about 56%) of the stored nitrogen in these old fallen leaves can be transferred to the mother branch. However, if the leaves of 9 to 10 months of age fall off, there is almost no return of nitrogen. Therefore, even if the new leaf grows into a normal leaf replacement period, if the old leaves fall off too much, it will cause a considerable loss of tree nutrients. The loss of new leaves, photosynthetic efficiency is reduced more seriously, and losses are greater. Honey pomelo leaves accumulated nutrients in autumn and winter, for flower bud differentiation and the development of spring shoots, leaves, and flowers of the following year. Therefore, we must focus on protecting the leaves from late autumn until flowering, and drop some old leaves as little as possible after flowering. There are many reasons for the early fall of leaves, and there are many reasons for the same drop.
In summer and autumn, tree shoot growth and fruit growth have large consumption of nitrogen, coupled with the leaching of soil nitrogen by rainwater. If there is no nitrogen supplement in time in late autumn, or if fertilizer is applied but water shortage is not enough, it will enter winter. After the plant will gradually "winter". If the main vein is yellow, the main side veins and the whole leaf yellow are heavy. If the nitrogen deficiency continues, the fallen leaves will be early, and the severe ones will affect the tree vigor. This symptom of chlorosis is similar to that of root rot, water immersion, deep ploughing, or the appearance of symptoms in the cortex of branches and mechanical wounds (eg, ring peeling). These are due to the lack of nitrogen in the leaves and cause leaf veins and yellow leaves. The situation described in the following paragraphs can occur on an annual basis. It can also occur on soils rich in nitrogen and abundant in water, and fertilization cannot be cured. The "Winter Yellow" nitrogen treatment can be cured, especially the fastest recovery of ammonia nitrogen, this "winter" is due to dry or winter cold caused by late autumn.
The main measures for protecting the leaves are to strengthen management of orchard water and fertilizer, timely prevention of pests and diseases, fruit harvested in batches, and top dressing in winter.
2, cold, post-freezing management
(1) Cold-adapted scientifically selected lands are to be planted in suitable places; protected wind forests are to be cultivated to create good ecological conditions; fertilizer and water management should be strengthened; and when the frost time is long, the orchards can be smoke-free and frozen.
(2) Post-freezing management 1 Strengthen spring nursing and increase water and fertilizer in time. After being frozen, the orchards that are seriously affected by freezing trees and soil are required to be watered with mulch at noon or afternoon, and additional thermal fertilizers such as grass ash, fire soil and phosphorus and potassium fertilizers should be added. After the temperature rises, extra-root fertilizer is applied. Each 50 kg of water plus compound fertilizer 150 grams, 200 grams of magnesium sulfate, 100 grams of potassium dihydrogen phosphate and 75 grams of borax, or spraying fertilizer urea diamine fertilizer or fertilizer king. Apply water and fertilizer in time in spring, spray foliar fertilizer when pumping spring shoots.
2 Reasonable pruning. For trees that are frozen, simply cut off the dead branches and branches. For severely frozen trees, cut frozen dead shoots, bandage clips with thin membranes to reduce moisture loss, or use black tape to wrap the wound or apply it with cow's urine and red clay to promote wound healing.
3 For girdling trees, apply fresh cow urine plus red clay and calcium magnesium phosphate fertilizer after thawing, and mix carbendazim into a thick mixture. Apply it to the ring and then use an opaque film or black tape to wrap it to promote wound healing. This method works well. Generally wounds heal up to 10 days.
4 Strengthen pest control. Frost damage caused damage to the branches and leaves of the pomelo tree, and the wounds are prone to cause some diseases. In addition, attention should be paid to the prevention of aphids, mites, etc. so as not to harm the new shoots.
Whether or not green leaves can turn green reflects whether the formation of chlorophyll is good. Light, temperature, moisture, and nutrients all affect the green color of pomelo leaves. Roots and soil conditions affect nutrient uptake and supply, and have a great impact on leaf greening. Light is a necessary condition for the formation of chlorophyll. However, excessive light has a destructive effect on the accumulation of chlorophyll. Practice has proved that the new leaves of honey pomelo have the fastest conversion to green in the absence of strong sunlight, low evaporation, moist soil, and suitable soil temperature for root groups. However, under strong sunlight, the new leaves can turn green if they can ensure normal absorption of water and nutrients. The long-term accumulation of water, the root absorption function is reduced, and the leaves often show a lack of various elemental symptoms. An orchard that is easy to accumulate in spring and summer but easy to dry in autumn and winter is easy to make a lot of fallen leaves. The low temperature also affects the normal turning of the leaves to green. In case of cold wind, late autumn shoots and winter shoots are more likely to show green turning. The lack of some element necessary for the formation of chlorophyll in the soil also affects the turning of the leaves.
Pomelo leaves fall out after 17 to 24 months. About half (about 56%) of the stored nitrogen in these old fallen leaves can be transferred to the mother branch. However, if the leaves of 9 to 10 months of age fall off, there is almost no return of nitrogen. Therefore, even if the new leaf grows into a normal leaf replacement period, if the old leaves fall off too much, it will cause a considerable loss of tree nutrients. The loss of new leaves, photosynthetic efficiency is reduced more seriously, and losses are greater. Honey pomelo leaves accumulated nutrients in autumn and winter, for flower bud differentiation and the development of spring shoots, leaves, and flowers of the following year. Therefore, we must focus on protecting the leaves from late autumn until flowering, and drop some old leaves as little as possible after flowering. There are many reasons for the early fall of leaves, and there are many reasons for the same drop.
In summer and autumn, tree shoot growth and fruit growth have large consumption of nitrogen, coupled with the leaching of soil nitrogen by rainwater. If there is no nitrogen supplement in time in late autumn, or if fertilizer is applied but water shortage is not enough, it will enter winter. After the plant will gradually "winter". If the main vein is yellow, the main side veins and the whole leaf yellow are heavy. If the nitrogen deficiency continues, the fallen leaves will be early, and the severe ones will affect the tree vigor. This symptom of chlorosis is similar to that of root rot, water immersion, deep ploughing, or the appearance of symptoms in the cortex of branches and mechanical wounds (eg, ring peeling). These are due to the lack of nitrogen in the leaves and cause leaf veins and yellow leaves. The situation described in the following paragraphs can occur on an annual basis. It can also occur on soils rich in nitrogen and abundant in water, and fertilization cannot be cured. The "Winter Yellow" nitrogen treatment can be cured, especially the fastest recovery of ammonia nitrogen, this "winter" is due to dry or winter cold caused by late autumn.
The main measures for protecting the leaves are to strengthen management of orchard water and fertilizer, timely prevention of pests and diseases, fruit harvested in batches, and top dressing in winter.
2, cold, post-freezing management
(1) Cold-adapted scientifically selected lands are to be planted in suitable places; protected wind forests are to be cultivated to create good ecological conditions; fertilizer and water management should be strengthened; and when the frost time is long, the orchards can be smoke-free and frozen.
(2) Post-freezing management 1 Strengthen spring nursing and increase water and fertilizer in time. After being frozen, the orchards that are seriously affected by freezing trees and soil are required to be watered with mulch at noon or afternoon, and additional thermal fertilizers such as grass ash, fire soil and phosphorus and potassium fertilizers should be added. After the temperature rises, extra-root fertilizer is applied. Each 50 kg of water plus compound fertilizer 150 grams, 200 grams of magnesium sulfate, 100 grams of potassium dihydrogen phosphate and 75 grams of borax, or spraying fertilizer urea diamine fertilizer or fertilizer king. Apply water and fertilizer in time in spring, spray foliar fertilizer when pumping spring shoots.
2 Reasonable pruning. For trees that are frozen, simply cut off the dead branches and branches. For severely frozen trees, cut frozen dead shoots, bandage clips with thin membranes to reduce moisture loss, or use black tape to wrap the wound or apply it with cow's urine and red clay to promote wound healing.
3 For girdling trees, apply fresh cow urine plus red clay and calcium magnesium phosphate fertilizer after thawing, and mix carbendazim into a thick mixture. Apply it to the ring and then use an opaque film or black tape to wrap it to promote wound healing. This method works well. Generally wounds heal up to 10 days.
4 Strengthen pest control. Frost damage caused damage to the branches and leaves of the pomelo tree, and the wounds are prone to cause some diseases. In addition, attention should be paid to the prevention of aphids, mites, etc. so as not to harm the new shoots.
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