One, nitrogen deficiency syndrome
1. Symptoms generally begin when there is a deficiency of nitrogen, especially during the period of peak growth. The leaves gradually change from green to light green, and as the nitrogen deficiency increases, the leaves turn yellow, and local char is slightly smaller than normal leaves. With the increase of nitrogen deficiency in young leaves, the leaves are greener. The petioles and calyces of the old leaves are reddish, with pale leaves or jagged, bright red. Poor soil and no normal fertilization, extensive management, weeds and susceptible to nitrogen deficiency.
2. Control methods should be applied to the base fertilizer to meet the short and concentrated growth characteristics of the spring growth period. If nitrogen deficiency is found, apply 11.5 kg of ammonium nitrate or 8.5 kg of urea per acre and apply water immediately after application. Florescence can also be sprayed with 0.3% to 0.5% of urea solution fertilizer 1-2 times per acre spray fertilizer solution 50 kg or 0.2% potassium dihydrogen phosphate solution 2-3 times.
Second, phosphorus deficiency
1. Symptoms Plant growth is weak, growth is slow, and the leaf color is dark green with bronze. When phosphorus deficiency aggravated, the appearance of the upper leaves showed a purple spot, and the older leaves also had this feature. Phosphorus-deficient plants had smaller flowers and fruit than normal plants. Soils with high calcium or high acidity, and soils with loose sand or organic matter are prone to phosphorus deficiency.
2. Control methods When the plants begin to show symptoms, they should be sprayed with 1% of superphosphate clear solution or 0.1%-0.2% of potassium dihydrogen phosphate solution 2-3 times, spraying once every 7-10 days. Fertilizer 50 kg.
Third, potassium deficiency
1. Symptoms Symptoms of initial potassium deficiency in strawberries often occur in newly mature upper leaves. Leaf edges often appear black, brown and dry, followed by burns. They also develop towards the center between the veins of most of the leaves. Old leaves suffer severe damage. Illumination will increase leaf burns, so the lack of potassium is often confused with "sunburn." The petiole of the burned leaf often develops brown to dark brown, with mild damage, and gradually wither. The potassium-deficient strawberry has a light color and poor taste.
2. Control methods Adequate organic fertilizer is applied, and about 7.5 kilograms of potassium sulfate is applied per acre; Alternatively, a 0.1%-0.2% potassium dihydrogen phosphate solution may be sprayed on the leaves 2-3 times, once every 7-10 days. Mu spray fertilizer 50 kg.
Fourth, magnesium deficiency
1. Symptoms The edges of the upper leaves are initially yellowed and browned and coke, and the chlorosis between veins occurs with dark thirst-colored spots, and some spots develop into necrotic spots. When scorch is aggravated, the stem leaves appear pale green and swell, and the coking phenomenon develops with the increase of leaf age and the increase of magnesium deficiency. Generally, magnesium deficiency disease is easy to occur when strawberries are cultivated in sandy soil or nitrogen fertilizer and potassium fertilizer are used excessively.
2. Control methods Foliar spraying 1% - 2% magnesium sulfate solution 2-3 times, spraying once every 10 days, each spray fertilizer fertilizer 50 kg per acre.
Fifth, boron deficiency syndrome
1. Symptoms of early boron deficiency, young leaves appear shrinkage and leaf coke, leaves yellow edges, growth point damage. With the increase of boron deficiency, the veins of the old leaves will turn green or the leaves will curl upwards. Boron-deficient plants have small flowers, low rates of pollination and seed setting, fruit deformities or tumors, small fruit seeds, and poor fruit quality. Boron-deficient soils and soils are susceptible to boron deficiency during drought.
2. Control methods timely watering, increase soil soluble boron content, in order to facilitate plant absorption. Boron-deficient strawberries can be sprayed with 0.15% borax solution 2-3 times. During the flowering period, the concentration of boron should be appropriately reduced. Each time, 50 kg of fertilizer solution should be sprayed.
Sixth, iron deficiency disease
1. Symptoms of young leaves yellow or chlorosis, with the degree of yellowing and become white. In moderate iron deficiency, the veins are green and the veins are yellow-white. In the case of severe iron deficiency, the newly grown leaves turn white, and the leaves become necrotic or yellow. Alkaline soils or acidic soils are prone to iron deficiency.
2. Control methods to adjust the soil pH, the soil pH value of 6-6.5, foliar spray 0.2% -0.5% of ferrous sulfate solution 2-3 times.
Seven, zinc deficiency
1. Symptoms When zinc deficiency worsens, old leaves narrow. In particular, the thinner the zinc leaf in the base, the more elongated the narrow leaf portion. However, zinc deficiency does not cause necrosis. When severely deficient in zinc, the new leaves were yellowed, the veins were reddish, and the edges of the leaves were clearly serrated. Zinc deficiency results in fewer plants.
2. Prevention and control methods Add organic fertilizer, improve soil, spray foliar spraying 0.05%-0.1% zinc sulfate solution 2-3 times. Spray concentration should not be too high to avoid phytotoxicity.
Eight, lack of molybdenum
1. In the early stage of molybdenum deficiency symptoms, the leaves were evenly reduced from green to light, regardless of young leaves or leaves becoming yellow. With the increase of the degree of molybdenum deficiency, the blade appeared scorch and the leaf edge curled.
2. Control methods Foliar application of 0.03% -0.05% ammonium molybdate solution 2 times, each time 50 kg per acre spray fertilizer.
1. Symptoms generally begin when there is a deficiency of nitrogen, especially during the period of peak growth. The leaves gradually change from green to light green, and as the nitrogen deficiency increases, the leaves turn yellow, and local char is slightly smaller than normal leaves. With the increase of nitrogen deficiency in young leaves, the leaves are greener. The petioles and calyces of the old leaves are reddish, with pale leaves or jagged, bright red. Poor soil and no normal fertilization, extensive management, weeds and susceptible to nitrogen deficiency.
2. Control methods should be applied to the base fertilizer to meet the short and concentrated growth characteristics of the spring growth period. If nitrogen deficiency is found, apply 11.5 kg of ammonium nitrate or 8.5 kg of urea per acre and apply water immediately after application. Florescence can also be sprayed with 0.3% to 0.5% of urea solution fertilizer 1-2 times per acre spray fertilizer solution 50 kg or 0.2% potassium dihydrogen phosphate solution 2-3 times.
Second, phosphorus deficiency
1. Symptoms Plant growth is weak, growth is slow, and the leaf color is dark green with bronze. When phosphorus deficiency aggravated, the appearance of the upper leaves showed a purple spot, and the older leaves also had this feature. Phosphorus-deficient plants had smaller flowers and fruit than normal plants. Soils with high calcium or high acidity, and soils with loose sand or organic matter are prone to phosphorus deficiency.
2. Control methods When the plants begin to show symptoms, they should be sprayed with 1% of superphosphate clear solution or 0.1%-0.2% of potassium dihydrogen phosphate solution 2-3 times, spraying once every 7-10 days. Fertilizer 50 kg.
Third, potassium deficiency
1. Symptoms Symptoms of initial potassium deficiency in strawberries often occur in newly mature upper leaves. Leaf edges often appear black, brown and dry, followed by burns. They also develop towards the center between the veins of most of the leaves. Old leaves suffer severe damage. Illumination will increase leaf burns, so the lack of potassium is often confused with "sunburn." The petiole of the burned leaf often develops brown to dark brown, with mild damage, and gradually wither. The potassium-deficient strawberry has a light color and poor taste.
2. Control methods Adequate organic fertilizer is applied, and about 7.5 kilograms of potassium sulfate is applied per acre; Alternatively, a 0.1%-0.2% potassium dihydrogen phosphate solution may be sprayed on the leaves 2-3 times, once every 7-10 days. Mu spray fertilizer 50 kg.
Fourth, magnesium deficiency
1. Symptoms The edges of the upper leaves are initially yellowed and browned and coke, and the chlorosis between veins occurs with dark thirst-colored spots, and some spots develop into necrotic spots. When scorch is aggravated, the stem leaves appear pale green and swell, and the coking phenomenon develops with the increase of leaf age and the increase of magnesium deficiency. Generally, magnesium deficiency disease is easy to occur when strawberries are cultivated in sandy soil or nitrogen fertilizer and potassium fertilizer are used excessively.
2. Control methods Foliar spraying 1% - 2% magnesium sulfate solution 2-3 times, spraying once every 10 days, each spray fertilizer fertilizer 50 kg per acre.
Fifth, boron deficiency syndrome
1. Symptoms of early boron deficiency, young leaves appear shrinkage and leaf coke, leaves yellow edges, growth point damage. With the increase of boron deficiency, the veins of the old leaves will turn green or the leaves will curl upwards. Boron-deficient plants have small flowers, low rates of pollination and seed setting, fruit deformities or tumors, small fruit seeds, and poor fruit quality. Boron-deficient soils and soils are susceptible to boron deficiency during drought.
2. Control methods timely watering, increase soil soluble boron content, in order to facilitate plant absorption. Boron-deficient strawberries can be sprayed with 0.15% borax solution 2-3 times. During the flowering period, the concentration of boron should be appropriately reduced. Each time, 50 kg of fertilizer solution should be sprayed.
Sixth, iron deficiency disease
1. Symptoms of young leaves yellow or chlorosis, with the degree of yellowing and become white. In moderate iron deficiency, the veins are green and the veins are yellow-white. In the case of severe iron deficiency, the newly grown leaves turn white, and the leaves become necrotic or yellow. Alkaline soils or acidic soils are prone to iron deficiency.
2. Control methods to adjust the soil pH, the soil pH value of 6-6.5, foliar spray 0.2% -0.5% of ferrous sulfate solution 2-3 times.
Seven, zinc deficiency
1. Symptoms When zinc deficiency worsens, old leaves narrow. In particular, the thinner the zinc leaf in the base, the more elongated the narrow leaf portion. However, zinc deficiency does not cause necrosis. When severely deficient in zinc, the new leaves were yellowed, the veins were reddish, and the edges of the leaves were clearly serrated. Zinc deficiency results in fewer plants.
2. Prevention and control methods Add organic fertilizer, improve soil, spray foliar spraying 0.05%-0.1% zinc sulfate solution 2-3 times. Spray concentration should not be too high to avoid phytotoxicity.
Eight, lack of molybdenum
1. In the early stage of molybdenum deficiency symptoms, the leaves were evenly reduced from green to light, regardless of young leaves or leaves becoming yellow. With the increase of the degree of molybdenum deficiency, the blade appeared scorch and the leaf edge curled.
2. Control methods Foliar application of 0.03% -0.05% ammonium molybdate solution 2 times, each time 50 kg per acre spray fertilizer.
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