In autumn and winter of 1995, it was rainy and sunny. From early spring to early rain, the temperature is high, and after nine days of rain and rain, the temperature is too low. If the winter fertilizer is slowly applied to the teak tree before the rain, due to the influence of low temperature and rain, the ability of root absorption is poor, the growth of roots is hindered, and the roots are rotted. Part of the pomelo farm winter fertilizer fertilization ditch did not timely irrigation, dry fertilization ditch too deep, spring rain is easy to water, prone to rot, in general, the impact of a large number of deciduous winter and spring reasons are: low temperature, mechanical Injuries, long-term drought, improper use of pesticides, pests and diseases, excessive application of fertilizers, especially excessive application of acid fertilizers, yellowing of old leaves in winter, a large number of fallen leaves, more than 80% of the number of fallen leaves, and the whole plant leaves in severe cases is 100%. Some citrons have large areas of defoliation. It is also common for most of the old leaves of grapefruit trees to have a large amount of fallen leaves before the bud shoots or shoots start.
Orchard production. If each grapefruit tree is applied to the soil with more than two or two boraxes, boron poisoning occurs when the old leaves turn yellow in winter, and a large number of old leaves fall before the chill, and the number of fallen leaves is more than 90%, and large areas are affected. Although there are long new leaves after the beginning of spring, However, there are few flowering buds, and after flower buds, the result is poor and the fruit is small. Under the bad weather conditions, the winter fertilizers are mixed with too many kinds of fertilizers. The fertilization is close to the trees and continuously encounters many days of cloudy and rainy weather. The weather turns cloudy and the temperature is high. Roots and rot caused defoliation. Under conditions of prolonged drought conditions, circumcision and ring-opening premature wounds were greater than 1 cm or more. After entering the result, the pomelo tree was deeply turned and roots were broken, resulting in a large number of fallen leaves, deep turnings, and broken roots. After the expansion of the hole, it usually causes defoliation, which causes more spring flowers and poor results. During the year, the fruit trees are weak and the fruit is easily cracked during the ripening period.
Spring shoots and young leaves contain high concentrations of pesticides, severe damage to spring shoots, damage to leaf greens, poor chlorophyll production in leaves, yellowing of leaves in winter, heavy defoliation, poorly drained pomelo gardens, deep plowing in winter, Expansion of points, spring rain, burrowing of water in the area of ​​the hole and the ground causes the weak tree to produce fallen leaves.
Acid fertilizers are used in excessive quantities: partial application of heavy calcium, potassium sulfate, potassium chloride, acidification of soil, collapse of land, and loss of many elements cause defoliation.
In the orchard with weak vigor, the concentration of rosin mixture in winter is high, defoliation occurs after spraying, and there is also a main reason for the use of lime sulfur in the orchard deciduous plants. Lignosulfide cocktail grapefruit is generally not to be used.
Pests and diseases are a serious hazard. Yellow leaves appear in the early winter at the end of fall, and a large amount of fallen leaves in cold winters.
The causes of the above-mentioned several kinds of fallen leaves: Proposed the following several measures. (1) Strengthen the management of grapefruit gardens. (2) Increase farm manure. (3) Nitrogen, phosphorus and potassium should be used properly, calcium magnesium and phosphorus should be added, calcium superphosphate should be reduced, and lime should be acidified every summer to increase the amount of calcium in the soil. (4) Spring shoots and young fruit period use one and two and a half borax + potassium dihydrogen phosphate - two half + water 100 pounds each spray 1-2 times. (5) The result trees and old trees are cultivating in shallow depths in winter, and do not deep-root the roots. Weed cultivation can only be carried out on the outside of the canopy. Special attention should be paid to the use of orchards in paddy fields in order to protect the growth of roots and maintain the evergreen leaves. In the winter, the old pomelo girdling leaves one or two sprigs of each plant to avoid girdling, so as to ensure the conservation of tree vigor and prevent the defoliation from reducing the amount of flowers, so as to achieve the objective of increasing fruit production.
Orchard production. If each grapefruit tree is applied to the soil with more than two or two boraxes, boron poisoning occurs when the old leaves turn yellow in winter, and a large number of old leaves fall before the chill, and the number of fallen leaves is more than 90%, and large areas are affected. Although there are long new leaves after the beginning of spring, However, there are few flowering buds, and after flower buds, the result is poor and the fruit is small. Under the bad weather conditions, the winter fertilizers are mixed with too many kinds of fertilizers. The fertilization is close to the trees and continuously encounters many days of cloudy and rainy weather. The weather turns cloudy and the temperature is high. Roots and rot caused defoliation. Under conditions of prolonged drought conditions, circumcision and ring-opening premature wounds were greater than 1 cm or more. After entering the result, the pomelo tree was deeply turned and roots were broken, resulting in a large number of fallen leaves, deep turnings, and broken roots. After the expansion of the hole, it usually causes defoliation, which causes more spring flowers and poor results. During the year, the fruit trees are weak and the fruit is easily cracked during the ripening period.
Spring shoots and young leaves contain high concentrations of pesticides, severe damage to spring shoots, damage to leaf greens, poor chlorophyll production in leaves, yellowing of leaves in winter, heavy defoliation, poorly drained pomelo gardens, deep plowing in winter, Expansion of points, spring rain, burrowing of water in the area of ​​the hole and the ground causes the weak tree to produce fallen leaves.
Acid fertilizers are used in excessive quantities: partial application of heavy calcium, potassium sulfate, potassium chloride, acidification of soil, collapse of land, and loss of many elements cause defoliation.
In the orchard with weak vigor, the concentration of rosin mixture in winter is high, defoliation occurs after spraying, and there is also a main reason for the use of lime sulfur in the orchard deciduous plants. Lignosulfide cocktail grapefruit is generally not to be used.
Pests and diseases are a serious hazard. Yellow leaves appear in the early winter at the end of fall, and a large amount of fallen leaves in cold winters.
The causes of the above-mentioned several kinds of fallen leaves: Proposed the following several measures. (1) Strengthen the management of grapefruit gardens. (2) Increase farm manure. (3) Nitrogen, phosphorus and potassium should be used properly, calcium magnesium and phosphorus should be added, calcium superphosphate should be reduced, and lime should be acidified every summer to increase the amount of calcium in the soil. (4) Spring shoots and young fruit period use one and two and a half borax + potassium dihydrogen phosphate - two half + water 100 pounds each spray 1-2 times. (5) The result trees and old trees are cultivating in shallow depths in winter, and do not deep-root the roots. Weed cultivation can only be carried out on the outside of the canopy. Special attention should be paid to the use of orchards in paddy fields in order to protect the growth of roots and maintain the evergreen leaves. In the winter, the old pomelo girdling leaves one or two sprigs of each plant to avoid girdling, so as to ensure the conservation of tree vigor and prevent the defoliation from reducing the amount of flowers, so as to achieve the objective of increasing fruit production.
We can do Popular Hologram 3D Led Fan Display In Air
Advertising LED Display, Digital Advertising Display,Hologram Display
Hebei Tomato Industry Co., Ltd. , https://www.hebeitomato.com