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What causes yellow leaves in soybeans before flowering

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In recent years, yellow leaf disease has occurred rather widely on soybeans and other legume crops. If not controlled in time, it can cause serious harm to crop growth. For example, when it occurs early, the leaves turn yellow, the plants are short and stunted, and no pods form. When it occurs at the mid stage, even if pods form, they contain no seeds, and even if there are seeds, they are shriveled, causing severe yield loss or total crop failure. The causes are as follows: First, long-term application of chemical fertilizers and reduced use of farmyard manure have caused soil compaction. Second, in recent years, the use of combine harvesters for harvesting wheat and the widespread practice of burning wheat stubble have destroyed the surface structure of the soil. Third, nutrient deficiency

In recent years, yellow leaf disease has occurred rather widely on soybeans and other legume crops. If not controlled in time, it can cause serious harm to crop growth. For example, when it occurs early, the leaves turn yellow, the plants are short and stunted, and no pods form. When it occurs at the mid stage, even if pods form, they contain no seeds, and even if there are seeds, they are shriveled, causing severe yield loss or total crop failure.

The causes are as follows: First, long-term application of chemical fertilizers and reduced use of farmyard manure have caused soil compaction. Second, in recent years, the use of combine harvesters for harvesting wheat and the widespread practice of burning wheat stubble have destroyed the surface structure of the soil. Third, nutrient deficiency symptoms are severe: such as iron, calcium, etc. Fourth, bacterial infection. The above are the main causes of yellow leaf disease.

The types of yellow leaf disease can be summarized as: nutrient deficiency type, bacterial type, sugar deficiency type, etc. Prolonged overcast and rainy weather and poor photosynthesis cause plants to lack sugar; yellow leaves appear, causing premature aging, leaf drop, flower drop, and no fruiting, resulting in reduced yield.

Control measures: 1. Apply more farmyard manure and improve soil structure; 2. Use balanced formula fertilization and supplement trace elements (zinc, iron, sulfur, calcium); 3. Ban burning of wheat stubble and protect soil structure; 4. When yellow leaf disease occurs, spray micro-fertilizer; per mu spray 2 liang of zinc sulfate, together with one bag of the fungicide "Baozhida"; plant regulator "Lufeng 95" or "Sanriling", "Huimanfeng" (choose any one), and 2 liang of edible brown sugar. Three days after spraying, the plants turn green and return to normal.

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