Nitrogen is one of the three major elements that are indispensable for crop growth and development, and increase production and income. However, when it exceeds a certain amount, it will not only cause a decrease in the yield and quality of vegetables, but also produce harmful substances in the soil. Scientific research and production practices have shown that nearly 25% of the soil in greenhouse production has excessive fertilization. There is a limit to the application rate of nitrogen fertilizer on vegetables. Partial application or excessive application of nitrogen fertilizer has great harm to the growth and development of crops.
1. Excessive application of nitrogen fertilizer will cause excessive nitrogen in the soil. Excess nitrogen will form proteins with more carbohydrates, and the remaining carbohydrates will be used as raw materials to form the cell wall, which will cause the cell wall of the crop to become thinner and weaker, causing the plants to grow long, the stems are thick, and the leaves are large and thin, brittle. And easy to fold.
2. The crop absorbs too much nitrogen, the leaves are too large, the plants are closed, the ventilation and light transmission capacity are reduced, the light energy utilization rate of the crop group is reduced, the crops are vigorously breathed, the photosynthetic product consumption is increased, and the dry matter accumulation is reduced. , resulting in reduced production.
3. Excessive application of nitrogen fertilizer, the plant's ability to resist stress, susceptible to pests and diseases and freezing damage, especially susceptible to viruses.
4. Excessive application of nitrogen fertilizer will inhibit the absorption of phosphorus, potassium and trace elements, resulting in slow fruit ripening, color irregularity, deformed fruit, resulting in reduced flower bud differentiation rate, excessive vegetative growth, low fruit setting rate or no fruit setting, and fruit expansion speed. Slow, turn melons.
5. The greenhouse vegetable application of excessive nitrogen fertilizer, soil water soluble nitrogen content, easy to convert into ammonia or nitric acid gas, continuously released from the soil into the air, causing ammonia or nitric acid gas poisoning, smoked vegetable leaves.
6. Excessive application of nitrogen fertilizer will also aggravate secondary salinization of soil, so that calcium, magnesium and other nutrients in vegetable fruits are significantly reduced, and calcium deficiency and magnesium deficiency often occur.
In short, the application of nitrogen fertilizer must be timely and appropriate, in combination with other nutrients. At different stages of vegetable growth, it is necessary to regularly monitor the soil nitrogen process, promote soil testing and formula fertilization, so that the vegetable farmers can completely get rid of the fat damage, fertilize and increase production without increasing income or fertilize without increasing production, and even increase the yield of the perishment. .
Alpine Yao
Farmers Daily
1. Excessive application of nitrogen fertilizer will cause excessive nitrogen in the soil. Excess nitrogen will form proteins with more carbohydrates, and the remaining carbohydrates will be used as raw materials to form the cell wall, which will cause the cell wall of the crop to become thinner and weaker, causing the plants to grow long, the stems are thick, and the leaves are large and thin, brittle. And easy to fold.
2. The crop absorbs too much nitrogen, the leaves are too large, the plants are closed, the ventilation and light transmission capacity are reduced, the light energy utilization rate of the crop group is reduced, the crops are vigorously breathed, the photosynthetic product consumption is increased, and the dry matter accumulation is reduced. , resulting in reduced production.
3. Excessive application of nitrogen fertilizer, the plant's ability to resist stress, susceptible to pests and diseases and freezing damage, especially susceptible to viruses.
4. Excessive application of nitrogen fertilizer will inhibit the absorption of phosphorus, potassium and trace elements, resulting in slow fruit ripening, color irregularity, deformed fruit, resulting in reduced flower bud differentiation rate, excessive vegetative growth, low fruit setting rate or no fruit setting, and fruit expansion speed. Slow, turn melons.
5. The greenhouse vegetable application of excessive nitrogen fertilizer, soil water soluble nitrogen content, easy to convert into ammonia or nitric acid gas, continuously released from the soil into the air, causing ammonia or nitric acid gas poisoning, smoked vegetable leaves.
6. Excessive application of nitrogen fertilizer will also aggravate secondary salinization of soil, so that calcium, magnesium and other nutrients in vegetable fruits are significantly reduced, and calcium deficiency and magnesium deficiency often occur.
In short, the application of nitrogen fertilizer must be timely and appropriate, in combination with other nutrients. At different stages of vegetable growth, it is necessary to regularly monitor the soil nitrogen process, promote soil testing and formula fertilization, so that the vegetable farmers can completely get rid of the fat damage, fertilize and increase production without increasing income or fertilize without increasing production, and even increase the yield of the perishment. .
Alpine Yao
Farmers Daily
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