In fields where broccoli are grown, after several years of continuous cropping, there will be some deficiencies in the middle and trace elements. Through the investigation of broccoli cultivation in this region, the most obvious symptom is the lack of molybdenum. It has a very close relationship with nitrogen metabolism in plants. The performance of molybdenum not only plays an important role in biological nitrogen fixation, but also participates in the reduction of nitric acid because molybdenum is a component of nitrate reductase.
Symptoms of molybdenum-deficient molybdenum: poor growth and development, short plants, chlorotic leaves or strips, leaves along the veins.
Prevention:
1, increase organic fertilizer: organic fertilizer contains various nutrients required for plant growth, it can release the molybdenum element for broccoli absorption during fermentation decomposition process.
2. Use sodium molybdate or ammonium molybdate together with base fertilizer: mix 0.5-1.0kg/mu sodium molybdate or ammonium molybdate with base fertilizer and mix well.
3. Spray sodium molybdate or ammonium molybdate: Use two-thousandths of the concentration of sodium molybdate or ammonium molybdate for foliar spraying (concentration should not exceed three-thousandths, otherwise it will produce phytotoxicity). Spray three times.
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