Foliar fertilization has less fertilizer and faster absorption (general fertilizer can be absorbed and utilized by leaves for 15min to 2h), with obvious fertilizer effect, strong target, no soil fixation, and no restriction on root absorption function. It has a positive effect on enhancing tree potential, maintaining flowers and fruits, improving fruit quality, correcting deficiency syndrome, improving wintering drought resistance and resistance to diseases and insects.
1. Fertilization period
Fruit surface fertilization is generally applied in several periods such as flowering, flowering, strong fruit, wintering, and deficiency. The spraying interval is about 15d. Different fertilizers have different spraying effects in different periods. The effect of boron fertilizer on zinc fertilizer in the initial flowering stage, spraying and molybdenum fertilizer is relatively better.
2, fertilizer types
It is necessary to make fruit trees high-yield, stable, high-quality, and satisfy the demand of three main nutrients of oxygen, phosphorus and potassium in fruit trees, and at the same time, they cannot lack other trace elements such as calcium, magnesium, sulfur, iron, zinc, boron, molybdenum and copper. , manganese, etc. The types of fertilizers commonly used for foliar fertilization include: urea, potassium dihydrogen phosphate, potassium nitrate, superphosphate, magnesium sulfate, potassium sulfate, ferrous sulfate, zinc sulfate, boric acid, ammonium molybdate, copper sulfate, manganese sulfate, etc. .
3, lack of symptoms
To do foliar fertilization, it is first necessary to determine which nutrient elements are missing in the fruit tree in order to achieve the right medicine. The symptoms of hypoxia are: small leaves, yellowish green leaves, short branches, weak tree, slow growth, small fruit and smooth skin. The symptoms of phosphorus deficiency are: the old leaves are dark green to pale green to bronze, the leaves are small, small, severe and even scorched, the skin is thick, sour, and the fruit is severe before harvesting. The symptoms of potassium deficiency are: small leaves, green, wrinkled along the middle ribs, dead branches, small clusters of green fruits, thin and smooth skin. The symptoms of calcium deficiency are: the leaves begin to retreat from the edge, and then spread to the veins, and the small spots of the rot are formed in the leaf yellow area; the fruit is small. The deformed juice cells shrink. The symptoms of iron deficiency are: the new leaves are thin, the shoots are dry, and the fruit is light and light. The symptoms of magnesium deficiency are: the mature leaves and the midribs begin to retreat green, and then expand, the leaves are severe, the fruit is light and the taste is light. The symptoms of boron deficiency are: small leaf stalks with water-stained small spots, translucent; severely fallen flowers, fruit falling, mature fruit malformation, symptoms of sulphur deficiency: yellow leaves of new leaves, especially small leaves of leaves; Malformation, thick peel, juice shrinking and dry.
4, spray concentration
After the fruit trees are short of fertilizer, they should be sprayed at a certain ratio. Otherwise, not only the fertilizer is not good, but sometimes it may cause phytotoxicity. The spraying concentration varies depending on the fertilizer: urea is 0.2% to 0.5%, potassium dihydrogen phosphate is 0.3% to 0.5%, superphosphate is 0.5% to 1.0%, sulfuric acid is 0.2%, and potassium sulfate is 0.05%. ～0.1%, ferrous sulfate is 0.2% to 0.5%, zinc sulfate is 0.5% to 1.0%, boric acid is 0.1% to 0.2%, ammonium molybdate or sodium molybdate is 0.01%, and copper sulfate is 0.01% to 0.02%. The manganese sulfate is 0.05% to 0.1%. In short, foliar fertilization, regardless of the type of fertilizer sprayed, the concentration should generally be controlled below 0.5%. For chemical fertilizers with high impurities and low quality, it is best not to use them. The concentration of certain drugs that are barely used is controlled below 0.3% to prevent phytotoxicity. Even at a concentration of 0.5%, the amount per 667 m2 is preferably not more than 0.5 kg to ensure safety.
5, spraying parts
Spraying fertilizer should try to achieve the back of the sprayed leaves. There is a layer of bright cuticle on the front of the leaves, and moisture is not easy to enter. There is no stratum corneum on the back of the leaf, and there are many pores, and the fertilizer is easy to penetrate and absorb. In addition, foliar fertilization should not only spray the outer periphery of the canopy, but also spray the branches and leaves of the inner stalk; it is necessary to spray the upper leaves, but also to spray the lower middle leaves. Because the inner lychee leaves and the middle and lower leaves are not easy to get nutrients from the nutrients exported from the underground root system. Only when fertilizing the foliage, spray the liquid fertilizer evenly. Spray it. All the bits are sprayed to make the fertilizer evenly distributed. If foliar fertilization is carried out simultaneously with the control of pests and diseases, the front and back sides of the leaves are sprayed.
6, weather conditions
Whether the fertilizer can be absorbed in time is related to weather conditions such as temperature and humidity. When the temperature is between 18 and 25 degrees Celsius, the pores of the leaves of the fruit trees will all open. Fertilization at this time can greatly improve the fertilizer efficiency. When the temperature exceeds 30 degrees Celsius, the fertilizer is not only difficult to absorb, but may also cause phytotoxicity. When the air humidity is high, the fertilizer stays on the blade for a long time, and the absorbed nutrients are more. The air humidity is small, the fertilizer liquid will dry out quickly after spraying, and the concentration will increase, which will easily lead to damage to the blade. In general, foliar fertilization should be carried out on a sunny or cloudy day without wind, and it should be sprayed in the afternoon or evening. When the leaves have dew, they should be dehydrated and then fertilized.
1. Fertilization period
Fruit surface fertilization is generally applied in several periods such as flowering, flowering, strong fruit, wintering, and deficiency. The spraying interval is about 15d. Different fertilizers have different spraying effects in different periods. The effect of boron fertilizer on zinc fertilizer in the initial flowering stage, spraying and molybdenum fertilizer is relatively better.
2, fertilizer types
It is necessary to make fruit trees high-yield, stable, high-quality, and satisfy the demand of three main nutrients of oxygen, phosphorus and potassium in fruit trees, and at the same time, they cannot lack other trace elements such as calcium, magnesium, sulfur, iron, zinc, boron, molybdenum and copper. , manganese, etc. The types of fertilizers commonly used for foliar fertilization include: urea, potassium dihydrogen phosphate, potassium nitrate, superphosphate, magnesium sulfate, potassium sulfate, ferrous sulfate, zinc sulfate, boric acid, ammonium molybdate, copper sulfate, manganese sulfate, etc. .
3, lack of symptoms
To do foliar fertilization, it is first necessary to determine which nutrient elements are missing in the fruit tree in order to achieve the right medicine. The symptoms of hypoxia are: small leaves, yellowish green leaves, short branches, weak tree, slow growth, small fruit and smooth skin. The symptoms of phosphorus deficiency are: the old leaves are dark green to pale green to bronze, the leaves are small, small, severe and even scorched, the skin is thick, sour, and the fruit is severe before harvesting. The symptoms of potassium deficiency are: small leaves, green, wrinkled along the middle ribs, dead branches, small clusters of green fruits, thin and smooth skin. The symptoms of calcium deficiency are: the leaves begin to retreat from the edge, and then spread to the veins, and the small spots of the rot are formed in the leaf yellow area; the fruit is small. The deformed juice cells shrink. The symptoms of iron deficiency are: the new leaves are thin, the shoots are dry, and the fruit is light and light. The symptoms of magnesium deficiency are: the mature leaves and the midribs begin to retreat green, and then expand, the leaves are severe, the fruit is light and the taste is light. The symptoms of boron deficiency are: small leaf stalks with water-stained small spots, translucent; severely fallen flowers, fruit falling, mature fruit malformation, symptoms of sulphur deficiency: yellow leaves of new leaves, especially small leaves of leaves; Malformation, thick peel, juice shrinking and dry.
4, spray concentration
After the fruit trees are short of fertilizer, they should be sprayed at a certain ratio. Otherwise, not only the fertilizer is not good, but sometimes it may cause phytotoxicity. The spraying concentration varies depending on the fertilizer: urea is 0.2% to 0.5%, potassium dihydrogen phosphate is 0.3% to 0.5%, superphosphate is 0.5% to 1.0%, sulfuric acid is 0.2%, and potassium sulfate is 0.05%. ～0.1%, ferrous sulfate is 0.2% to 0.5%, zinc sulfate is 0.5% to 1.0%, boric acid is 0.1% to 0.2%, ammonium molybdate or sodium molybdate is 0.01%, and copper sulfate is 0.01% to 0.02%. The manganese sulfate is 0.05% to 0.1%. In short, foliar fertilization, regardless of the type of fertilizer sprayed, the concentration should generally be controlled below 0.5%. For chemical fertilizers with high impurities and low quality, it is best not to use them. The concentration of certain drugs that are barely used is controlled below 0.3% to prevent phytotoxicity. Even at a concentration of 0.5%, the amount per 667 m2 is preferably not more than 0.5 kg to ensure safety.
5, spraying parts
Spraying fertilizer should try to achieve the back of the sprayed leaves. There is a layer of bright cuticle on the front of the leaves, and moisture is not easy to enter. There is no stratum corneum on the back of the leaf, and there are many pores, and the fertilizer is easy to penetrate and absorb. In addition, foliar fertilization should not only spray the outer periphery of the canopy, but also spray the branches and leaves of the inner stalk; it is necessary to spray the upper leaves, but also to spray the lower middle leaves. Because the inner lychee leaves and the middle and lower leaves are not easy to get nutrients from the nutrients exported from the underground root system. Only when fertilizing the foliage, spray the liquid fertilizer evenly. Spray it. All the bits are sprayed to make the fertilizer evenly distributed. If foliar fertilization is carried out simultaneously with the control of pests and diseases, the front and back sides of the leaves are sprayed.
6, weather conditions
Whether the fertilizer can be absorbed in time is related to weather conditions such as temperature and humidity. When the temperature is between 18 and 25 degrees Celsius, the pores of the leaves of the fruit trees will all open. Fertilization at this time can greatly improve the fertilizer efficiency. When the temperature exceeds 30 degrees Celsius, the fertilizer is not only difficult to absorb, but may also cause phytotoxicity. When the air humidity is high, the fertilizer stays on the blade for a long time, and the absorbed nutrients are more. The air humidity is small, the fertilizer liquid will dry out quickly after spraying, and the concentration will increase, which will easily lead to damage to the blade. In general, foliar fertilization should be carried out on a sunny or cloudy day without wind, and it should be sprayed in the afternoon or evening. When the leaves have dew, they should be dehydrated and then fertilized.
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】
Curtain Magnetic Decorative Clip
Pengjian Thread Factory , http://www.hzcurtainfringe.com