During the pepper planting process, many growers reported that the problem of pepper planting yellow leaves is actually a relationship of magnesium deficiency! Magnesium deficiency in pepper causes the leaves of the pepper to gradually yellow, causing the yellowing to gradually spread to the whole leaf of cucumber, and the pepper should be strengthened.
Symptoms of magnesium deficiency in pepper:
Magnesium deficiency in pepper often begins in the fruiting stage, and the leaves are yellowed along both sides of the main vein, gradually expanding to the whole leaf, but the main vein and lateral vein remain clear green. The lack of magnesium in sweet peppers often begins at the tip of the leaf and gradually spreads to the mesophyll on both sides of the vein. The more fruits that are formed on a pepper, the more severe the magnesium deficiency. Once magnesium is deficient, photosynthesis declines, fruit is small, and yield is low.
Capsicum magnesium deficiency pathogen:
1 Insufficient supply of magnesium in soil: The main factors affecting the effective magnesium level of soil are: First, the degree of soil weathering. Different soils have different magnesium content due to different parent materials and weathering degree. The red soil has high degree of weathering and the mineral decomposition is relatively thorough. Generally, it contains little magnesium. Purple soil has a low degree of weathering and high magnesium content. Generally, the red soil soil vegetable base in the south of China is prone to lack of magnesium. Second, the soil texture, the magnesium in the soil with strong sandy soil is easy to be washed, and the effective magnesium content in the soil is low, which often cannot meet the needs of vegetable growth. The coarse-grained magnesium-deficient soil is mainly distributed in river valleys and hilly areas.
2 climatic conditions: The impact of climatic conditions on magnesium deficiency has two main aspects, one is rainy; the other is drought and glare. Rainfall leads to the loss of magnesium. This effect is large-area, such as the distribution of magnesium-deficient soil in the south. Dry morning and strong light-induced magnesium deficiency is a small-area effect. For example, vegetables that are fully exposed to sunlight in the leaf-edge field are more prone to recurrence than those that are shaded inside. Drying reduces the absorption of magnesium by vegetables. Summer glare will aggravate magnesium deficiency, which may be caused by strong light destroying chlorophyll and accelerating leaf chlorosis.
3 Improper fertilization: When potassium is over-applied with potassium fertilizer and ammonium nitrogen fertilizer, magnesium deficiency is induced, because excessive potassium and ammonium ions destroy the nutrient balance and inhibit the absorption of magnesium by plants. Vegetables are generally biased with nitrogen fertilizer, which is one of the reasons for the current lack of magnesium in vegetables.
Prevention and treatment of magnesium deficiency in pepper:
Application of magnesium fertilizer: for the magnesium deficiency caused by magnesium deficiency in the soil can be supplemented with magnesium, generally with magnesium sulfate, etc., 2 to 4 kg per 667 square meters (according to effective magnesium juice). For some acidic soils, it is best to use magnesium-lime (lime-fired lime) 50-100 kg to supply both magnesium and soil acidity. Many fertilizers, such as calcium, magnesium and phosphate fertilizers, contain higher levels of magnesium, which can be selected according to local soil conditions and fertilization conditions.
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