Magnesium deficiency causes grape yellow leaves

Symptoms: Magnesium is an important component of chlorophyll. Magnesium can be transferred in the crop, so magnesium will migrate from the old to the new leaves in the absence of magnesium. Therefore, the symptoms of magnesium deficiency in grapes usually begin with the yellow leaves of the plant's base. The typical symptom is the first retreat between old leaves and veins. Further, there will be spotted yellow spots between the veins, and a large area of ​​yellowing will eventually appear from the center to the leaf margin. Then the yellow part is necrotic, leaving only the veins remaining green. When the symptoms of grape deficiency are severe, the upper and lower leaves of the grapes are yellow. These yellowed leaves generally do not show up too early, and often only appear to be large areas of the grape as a result.

In addition, the lack of magnesium in grapes will lead to poor fruit growth, delayed maturity, low sugar content, and fruit quality is significantly reduced.

Reasons: It is understood that the main reason for the lack of magnesium in local greenhouses is that when farmers grow grapes, the quality of the organic fertilizer used is poor and the quantity is insufficient. The main sources of fertilizer are chemical fertilizers and some cheaper fertilization, resulting in soil Insufficient supply of magnesium. Another reason is that due to the long-term use of chemical fertilizers that cause soil acidification, magnesium elements are more likely to be lost in acidic soils. Another reason is that in the past few years, the farmers who grow grapes know that potassium fertilizer is very important to increase the production of grapes. Therefore, they all pay attention to the use of potash fertilizer. The fertilizer used is mostly high-nitrogen and high-potassium fertilizers. Too much potassium fertilizer will also affect the use of potash fertilizer. Absorption of magnesium occurs as a result of magnesium deficiency.

Measures: First of all, we should change the fertilization habits and pay more attention to organic fertilizers. Pay attention to the coordination of N, P and K fertilizers to avoid partial application of N fertilizers and to strengthen the improvement of the soil so as to improve the acidic soil to neutrality. For grapes that are currently deficient in magnesium, the leaves are sprayed with 1%-2% magnesium sulfate and 600-fold Pleiaderin protein. Before and after the grape results, Prington fish protein and magnesium sulfate were flushed from the roots. In general, the United States Pleiden fish protein 4 kg + 8 kg of magnesium sulfate.

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