Why are vegetables still spindly and weak after applying nitrogen fertilizer
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Why are vegetables still spindly and weak after applying nitrogen fertilizer
Author: Article source: Henan Daily Rural Edition Publication date: 2018-02-08 Clicks:
Answer: For carbon and nitrogen fertilizers, crops not only need them but also require a suitable ratio. Greenhouses are managed as closed environments in winter, with insufficient light. After the beginning of spring, when temperatures rise again and light conditions improve, the photosynthesis of vegetables strengthens and they grow vigorously, but because the greenhouse is not ventilated, carbon is severely deficient. Under such conditions, applying nitrogen fertilizer instead worsens the imbalance of the plant's carbon-to-nitrogen ratio, making the vegetable seedlings grow thin and weak, and also prone to pests and diseases.
When the temperature inside the greenhouse is above 18°C, open the greenhouse in a timely and gradual manner, ventilate and let in light, clear away dead branches and fallen leaves, and spray a 0.2%-0.3% potassium dihydrogen phosphate solution. If a late spring cold snap occurs and ventilation is not possible, carbon dioxide fertilizer can be applied appropriately.
When the temperature inside the greenhouse is above 18°C, open the greenhouse in a timely and gradual manner, ventilate and let in light, clear away dead branches and fallen leaves, and spray a 0.2%-0.3% potassium dihydrogen phosphate solution. If a late spring cold snap occurs and ventilation is not possible, carbon dioxide fertilizer can be applied appropriately.
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