How to scientifically apply topdressing to onions? Key points on timing and methods of fertilization
How to scientifically apply topdressing to onions? Please provide guidance. After onions are planted, the root system grows first, then growth shifts to the aboveground part, and only after the aboveground part has grown fully do they enter the bulb swelling growth stage. According to the growth and development characteristics of onions, doing a good job of topdressing in stages is one of the keys to a high onion yield. Fertilizer for seedling recovery...
How to scientifically apply topdressing to onions? Please provide guidance
After onions are planted, the root system grows first, then growth shifts to the aboveground part, and only after the aboveground part has grown fully do they enter the bulb swelling growth stage. According to the growth and development characteristics of onions, doing a good job of topdressing in stages is one of the keys to a high onion yield.
Fertilizer for seedling recovery: Apply fertilizer for seedling recovery 15-20 days after planting, to supplement nutrients for the continued growth of the root system and at the same time prepare for the aboveground growth that will soon begin. Urea 5-6 kg/mu, broadcast and then water, to facilitate absorption and use.
Fertilizer for plant development: 30 days after planting, when vegetative growth strengthens, fertilizer for plant development should be applied to ensure the needs of functional leaf growth in the aboveground part. This is because the size of the leaf vegetative mass is very closely related to the size of the bulb later; promoting leaf growth in the early stage lays the foundation for the bulb swelling growth in the later stage. It is mainly nitrogen fertilizer, with urea 5-6 kg per mu and potassium sulfate 5 kg.
Fertilizer for promoting bulbs: After the plant has 8-10 tubular leaves, the bulb begins to expand, and fertilizer for promoting bulbs should be applied once. Fertilizer for promoting bulbs should focus on the middle stage of bulb swelling growth. When the bulb first begins swelling growth, nitrogen fertilizer must not be applied too much. If nitrogen fertilizer is applied excessively in the late stage of bulb swelling growth, "late maturity" will occur and affect harvest. Apply urea 5-7 kg per mu and potassium sulfate 8 kg. During the bulb swelling growth period, potassium deficiency will not only reduce yield, but also have a certain effect on the storability of the product.
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