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Expert comment: In the analysis of this case, agricultural expert Cao Yiping pointed out that although Chinese cabbage is a leafy crop, it has the characteristics of high yield and high fertilizer. However, Chinese cabbage is not a vegetable that only needs nitrogen and does not require phosphorus and potassium. In the cultivation, only nitrogen is applied, and the lack of phosphorus and potassium may cause a problem of unsatisfactory inclusion. Partial application of nitrogen fertilizer not only has low yield and quality, but also leads to poor core.
From the perspective of the whole growth period of Chinese cabbage, it is necessary to pass the three periods of seedling stage, rosette stage and core period. The nutrient absorption of Chinese cabbage seedlings is less, only 10%, and the rosette period accounts for 30%. Water control fertilizers, especially nitrogen fertilizers, allow the leaves of cabbage to grow slowly, which is also called the seedling stage. Do not let the water too much to cause the leaves to grow and erect, but should make the leaves grow like the rosettes, the leaves are tight and flat, and the ball can be tight, the yield is high, the quality is good, and the leaves are prematurely irrigated during the rosette period. And the application of nitrogen will cause the leaves to be long, the leaves are big and the problem is not true.
Case Tip: The unclearness of Chinese cabbage is caused by improper management of fertilizer and water. Partial application of nitrogen fertilizer, phosphorus and potassium nutrients will cause unsatisfactory concoct; the cabbage in the rosette period should control water and control nitrogen, lay a good foundation for the heart, premature watering and nitrogen application will cause unintentional. (Contributed by Sinofert Agricultural University Research Center)
From: New Rural Business Daily
How to apply fertilizer to make Chinese cabbage inclusive
Case: Some urban residents are dissatisfied with the quality of some Chinese cabbages sold in the market. These cabbages are large, large, green and outer leaves. For example, the cabbage grown by a farmer friend in the suburbs of Tianjin has had a problem of unpretentiousness. His field management is like this. With the expansion of the area planted with Chinese cabbage, organic fertilizer cannot be applied to the new vegetable fields. In order to obtain high yields in new vegetable fields, they have to use the big water and big fertilizer management methods. In the peasants, there is a saying that “the nitrogen fertilizer is a long leaf, and the Chinese cabbage can obtain high yield and high quality by applying more nitrogen fertilizerâ€, so he applied a bag of urea per acre in the base fertilizer. The fertilization amount of 50 kg of urea per mu is converted into 23 kg/mu of pure nitrogen. After the seedlings of cabbage, he originally wanted to play the dung water, but there was no condition, so he applied urea with water, respectively, at the seedling stage and rosette. During the period and the period of the core period, 5 times of urea was applied, and a total of 45 kg/mu of urea was applied. The sum of 5 times of irrigation was 200 square meters. When collecting Chinese cabbage, he estimated that the yield of Chinese cabbage was 2000 kg/mu. From the plant shape, the single plant is not heavy, the cabbage heart rate is relatively low, the cabbage is not true, and it is not resistant to storage.
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