Fruit tree "double good" fertilization, one refers to the choice of the best time for fertilization; the second refers to the best part of the fertilizer applied to the fruit trees.
First, the best time for topdressing According to the characteristics of fertilizer required for each phenological period of fruit trees, it is advisable to replenish fertilizers four times a year. The amount of topdressing should be flexibly controlled according to the tree potential and the age of the tree. The application of quick-acting fertilizers in the growth period of fruit trees not only regulates the contradiction between the growth of the year and the demand for nutrients, but also lays a good foundation for the flowering results in the coming year. 1. Flowering topdressing. When the fruit tree sprouts to the flowering stage, it consumes more nutrients. If the stored nutrients are insufficient in the previous year and the nutrient supply is not timely, the flowering period will be prolonged and the fruit setting rate will be lowered. Therefore, the amount of quick-acting fertilizer should be applied in the right amount before flowering. Those who have the condition to spray 250 times of borax aqueous solution during the flowering period can greatly improve the fruit setting rate. 2. After the flower is topdressing. After the flower falls, the young fruit and the new shoot grow rapidly. In this period, the top dress can make the new shoot grow robust, enlarge the leaf area, increase the photosynthetic productivity, and reduce the physiological fruit drop. If the amount of fertilizer applied before flowering is large, the fertilizer can be applied less after flowering. 3. Topdressing before flower bud differentiation. In this period, some new shoots have stopped growing, and the young fruit is rapidly expanding. Applying appropriate amount of nitrogen, phosphorus and potassium fertilizers in time can improve the photosynthesis effect of leaves, promote nutrient accumulation, facilitate flower bud differentiation, and alleviate the phenomenon of large and small years. 4. Fruit growth and long-term topdressing. This period of topdressing can not only increase the fruit yield in the current year, improve the quality, but also promote flower bud differentiation, fullness and fullness, and increase the accumulation of tree nutrients in the later stage. The above-mentioned topdressing and post-flowering top dressing should be closely combined, and should be based on quick-acting nitrogen fertilizer. The amount of fertilizer applied should be 1 kg of urea per plant. The third and fourth topdressing should be based on organic fertilizer, and the application of phosphorus and potassium fertilizer should be applied. Generally, 50 kg of livestock manure, 1 kg of superphosphate and 0.5 kg of potassium sulfate are applied to each mature tree. Each fertilization should be carried out in conjunction with watering.
Second, the best part of fertilization The root hair in the root system is the main part of the fruit tree to absorb fertilizer. Therefore, applying the fertilizer to the area where the root hair is concentrated is one of the important measures to improve the fertilizer efficiency. In general, the distribution of horizontal roots is about 1 to 2 times that of the canopy, but most of them are concentrated on the outer edge of the canopy projection and a little further away. The vertical distribution of roots varies with tree species, soil quality, and management level. Generally, roots such as apples, pears, walnuts, chestnuts, and grapes are distributed deeper, reaching 70-80 cm, while more than 80% of roots are concentrated around 60 cm. In the deep soil layer, the roots of peach, plum and apricot are distributed shallowly, and most of them are in the soil layer about 40 cm deep. Only by grasping the fertilization site of the fruit tree according to the above characteristics, the fertilizer effect can be maximized. In addition, the decomposition of organic fertilizer is slower, the fertilizer supply period is longer, and it should be applied deeper. The chemical fertilizer has greater mobility and can be applied shallowly.
First, the best time for topdressing According to the characteristics of fertilizer required for each phenological period of fruit trees, it is advisable to replenish fertilizers four times a year. The amount of topdressing should be flexibly controlled according to the tree potential and the age of the tree. The application of quick-acting fertilizers in the growth period of fruit trees not only regulates the contradiction between the growth of the year and the demand for nutrients, but also lays a good foundation for the flowering results in the coming year. 1. Flowering topdressing. When the fruit tree sprouts to the flowering stage, it consumes more nutrients. If the stored nutrients are insufficient in the previous year and the nutrient supply is not timely, the flowering period will be prolonged and the fruit setting rate will be lowered. Therefore, the amount of quick-acting fertilizer should be applied in the right amount before flowering. Those who have the condition to spray 250 times of borax aqueous solution during the flowering period can greatly improve the fruit setting rate. 2. After the flower is topdressing. After the flower falls, the young fruit and the new shoot grow rapidly. In this period, the top dress can make the new shoot grow robust, enlarge the leaf area, increase the photosynthetic productivity, and reduce the physiological fruit drop. If the amount of fertilizer applied before flowering is large, the fertilizer can be applied less after flowering. 3. Topdressing before flower bud differentiation. In this period, some new shoots have stopped growing, and the young fruit is rapidly expanding. Applying appropriate amount of nitrogen, phosphorus and potassium fertilizers in time can improve the photosynthesis effect of leaves, promote nutrient accumulation, facilitate flower bud differentiation, and alleviate the phenomenon of large and small years. 4. Fruit growth and long-term topdressing. This period of topdressing can not only increase the fruit yield in the current year, improve the quality, but also promote flower bud differentiation, fullness and fullness, and increase the accumulation of tree nutrients in the later stage. The above-mentioned topdressing and post-flowering top dressing should be closely combined, and should be based on quick-acting nitrogen fertilizer. The amount of fertilizer applied should be 1 kg of urea per plant. The third and fourth topdressing should be based on organic fertilizer, and the application of phosphorus and potassium fertilizer should be applied. Generally, 50 kg of livestock manure, 1 kg of superphosphate and 0.5 kg of potassium sulfate are applied to each mature tree. Each fertilization should be carried out in conjunction with watering.
Second, the best part of fertilization The root hair in the root system is the main part of the fruit tree to absorb fertilizer. Therefore, applying the fertilizer to the area where the root hair is concentrated is one of the important measures to improve the fertilizer efficiency. In general, the distribution of horizontal roots is about 1 to 2 times that of the canopy, but most of them are concentrated on the outer edge of the canopy projection and a little further away. The vertical distribution of roots varies with tree species, soil quality, and management level. Generally, roots such as apples, pears, walnuts, chestnuts, and grapes are distributed deeper, reaching 70-80 cm, while more than 80% of roots are concentrated around 60 cm. In the deep soil layer, the roots of peach, plum and apricot are distributed shallowly, and most of them are in the soil layer about 40 cm deep. Only by grasping the fertilization site of the fruit tree according to the above characteristics, the fertilizer effect can be maximized. In addition, the decomposition of organic fertilizer is slower, the fertilizer supply period is longer, and it should be applied deeper. The chemical fertilizer has greater mobility and can be applied shallowly.
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