Grape magnesium deficiency
2020-06-05 19:10:30
Symptoms: This is the most common form of deficiency in vineyards. Symptoms start from the old leaves at the base of the plant. The old veins chlorosis between the old veins, and then the veins develop into bands of yellow spots, which develop from the inside of the leaves to the leaf margins, gradually yellow, and finally the mesophyll tissue is brown and necrotic. The remaining veins remain green. Therefore, the boundary between meso-necrotic mesophyll and green veins is distinct. Magnesium deficiency disease generally does not have obvious symptoms at the beginning of the growing season. It begins to show symptoms and gradually aggravate from the fruit enlargement period, especially in plants with excessive fruit set. When the fruits are immature, a large number of yellow leaves appear, and diseased leaves do not generally fall early. Mg deficiency did not significantly affect fruit size and yield, but berry coloration was poor, maturity was delayed, and sugar was low.
![]()
Incidence conditions: The quality of organic fertilizer in the soil is poor and the quantity is small. The fertilizer source mainly depends on chemical fertilizers, which results in insufficient supply of magnesium in the soil. In addition, magnesium in acidic soils is more likely to be lost. Another reason is the excessive use of potash, or the application of large amounts of sodium nitrate and lime in orchards, and magnesium deficiency often occurs. This is especially noticeable after heavy rains in summer.
Control methods: The most fundamental measure is to apply high-quality organic fertilizer when the grape is planted. For adult trees, high-quality organic fertilizer should be added before the winter; the vineyard with serious magnesium deficiency should reduce the amount of potassium fertilizer in an appropriate amount; When the plants began to show symptoms of magnesium deficiency, the leaves were sprayed with 3 to 4% of magnesium sulfate and sprayed for 3 to 4 times during the growing season; in the case of magnesium-poor soil, magnesium sulfate may be considered to be about 100 kg per mu.
Incidence conditions: The quality of organic fertilizer in the soil is poor and the quantity is small. The fertilizer source mainly depends on chemical fertilizers, which results in insufficient supply of magnesium in the soil. In addition, magnesium in acidic soils is more likely to be lost. Another reason is the excessive use of potash, or the application of large amounts of sodium nitrate and lime in orchards, and magnesium deficiency often occurs. This is especially noticeable after heavy rains in summer.
Control methods: The most fundamental measure is to apply high-quality organic fertilizer when the grape is planted. For adult trees, high-quality organic fertilizer should be added before the winter; the vineyard with serious magnesium deficiency should reduce the amount of potassium fertilizer in an appropriate amount; When the plants began to show symptoms of magnesium deficiency, the leaves were sprayed with 3 to 4% of magnesium sulfate and sprayed for 3 to 4 times during the growing season; in the case of magnesium-poor soil, magnesium sulfate may be considered to be about 100 kg per mu.
Sodium Bicarbonate Injection,Albendazole Antidote,Safener Antidote,Cyanide Poison Antidote
NOUVASANT PHARMhealth LTD. , http://www.nouvasant.com