It is currently in the big autumn season, which is the season of vigorous growth of leafy vegetables such as Chinese cabbage and Chinese chives. As the weather gradually cools, the release rate of soil nutrients will slow down. At this time, the roots of the nutrients are absorbed by vegetables. It will also be reduced accordingly. In order to ensure high yields of vegetables in the late stage of nutrient supply, it is necessary to topdress.
How to topdress is reasonable? Here are two examples of applying top dressing:
[Case 1] In the Wuhan area, the vegetable farmer Ye Youliang, the topdressing of the open field leeks, he chose high-nitrogen and high-potassium compound fertilizer. The first day, the granular compound fertilizer was placed in a large tank, first broken and then water dissolved and allowed to stand still overnight. The melted fertilizer solution is flushed with water in a bucket. In the month before the harvest, the top dressing was applied 10 days later, and the amaranth after the top dressing grew vigorously, and the harvest was in sight.
[Case 2] Zhang Heping, a cabbage grower in the Xianghe area of ​​Hebei Province, began to water and topdress after the Chinese cabbage passed the rosette period. Under the guidance of the township farmer Xiao Wang, he purchased the simple fertilizers - ammonium sulfate and potassium chloride. Before fertilizing, the two kinds of single fertilizers are mixed and dissolved in the irrigation water, and then fertilized by the ditch irrigation, and the water is again taken after the fertilizer water is passed. Through two rounds of fertilization, the Chinese cabbage has a good heart and the leaf ball grows fast. He feels that this year's topdressing is significantly better than last year's only a large amount of urea. However, he has some doubts, because it has been said that leafy vegetables have the most nitrogen-like characteristics, so why is it better to apply nitrogen and fertilizer instead of topdressing fertilizer?
Experts: These two top dressing cases have achieved very good practical results, indicating that the later reasonable topdressing is necessary for high yield of leafy crops. The strong growth in the later stage has a large contribution to the formation of leafy vegetables. If you do not pay attention to the late topdressing, the loss of yield will be reduced by 20%, and 40% to 50%. It can be seen that topdressing is an important measure. Equally important is the rationality of topdressing techniques, including nutrient types, application rates and fertilization methods. The key technologies can be summarized as follows:
The nutrient type of leafy crops should be supplemented by nitrogen and potassium fertilizers. However, people in the current production are accustomed to partial nitrogen fertilizers. It is generally mistaken that leafy crops are nitrogen-producing crops, which require more nitrogen and can be produced with high nitrogen. . In fact, the demand for NPK in leafy crops is higher than that in nitrogen. Appropriate supplementation of some potash fertilizers in the later period will take effect for the yield formation and quality improvement of leafy vegetables. Generally, the phosphate fertilizer can be ignored, and the required phosphate fertilizer can be layered in the base fertilizer.
Fertilizers are available in water-soluble solid or liquid fertilizers. The current market is more solid fertilizer, powder or small block is preferred, such as ammonia, urea, ammonium sulfate, ammonium nitrate, potassium fertilizer can choose potassium chloride, potassium sulfate and potassium nitrate, calcium nitrate and other water-soluble The simple fertilizer containing less impurities generally does not use granular composite (mixed) fertilizer. Because the late topdressing is based on fertigation and water-flooding, it is not possible to use the method of soil-breaking fertilization. The granular compound fertilizer should be broken first and then dissolved, which is not worthwhile. However, the current granule compound fertilizer in the fertilizer market is mostly, which makes consumers have to use it. Case 1 is the case.
Control the total amount of topdressing and single dose: the amount of fertilizer should be refined, and more than one application, not only waste of fertilizer but also the eutrophication of groundwater and pollute the water environment. In particular, the amount of nitrogen fertilizer should be controlled, and the amount of single net nitrogen should be less than 2.5 kg.
Irrigation and fertilization is generally carried out in three steps. The first step is to first moisten the soil with clean water; the second step is to irrigate with the appropriate concentration of fertilizer water; the third step is to clean with water.
Source: Farmers Daily (Expert: Senior Consultant of Sinochem Fertilizer, Professor of China Agricultural University Cao Yiping)
How to topdress is reasonable? Here are two examples of applying top dressing:
[Case 1] In the Wuhan area, the vegetable farmer Ye Youliang, the topdressing of the open field leeks, he chose high-nitrogen and high-potassium compound fertilizer. The first day, the granular compound fertilizer was placed in a large tank, first broken and then water dissolved and allowed to stand still overnight. The melted fertilizer solution is flushed with water in a bucket. In the month before the harvest, the top dressing was applied 10 days later, and the amaranth after the top dressing grew vigorously, and the harvest was in sight.
[Case 2] Zhang Heping, a cabbage grower in the Xianghe area of ​​Hebei Province, began to water and topdress after the Chinese cabbage passed the rosette period. Under the guidance of the township farmer Xiao Wang, he purchased the simple fertilizers - ammonium sulfate and potassium chloride. Before fertilizing, the two kinds of single fertilizers are mixed and dissolved in the irrigation water, and then fertilized by the ditch irrigation, and the water is again taken after the fertilizer water is passed. Through two rounds of fertilization, the Chinese cabbage has a good heart and the leaf ball grows fast. He feels that this year's topdressing is significantly better than last year's only a large amount of urea. However, he has some doubts, because it has been said that leafy vegetables have the most nitrogen-like characteristics, so why is it better to apply nitrogen and fertilizer instead of topdressing fertilizer?
Experts: These two top dressing cases have achieved very good practical results, indicating that the later reasonable topdressing is necessary for high yield of leafy crops. The strong growth in the later stage has a large contribution to the formation of leafy vegetables. If you do not pay attention to the late topdressing, the loss of yield will be reduced by 20%, and 40% to 50%. It can be seen that topdressing is an important measure. Equally important is the rationality of topdressing techniques, including nutrient types, application rates and fertilization methods. The key technologies can be summarized as follows:
The nutrient type of leafy crops should be supplemented by nitrogen and potassium fertilizers. However, people in the current production are accustomed to partial nitrogen fertilizers. It is generally mistaken that leafy crops are nitrogen-producing crops, which require more nitrogen and can be produced with high nitrogen. . In fact, the demand for NPK in leafy crops is higher than that in nitrogen. Appropriate supplementation of some potash fertilizers in the later period will take effect for the yield formation and quality improvement of leafy vegetables. Generally, the phosphate fertilizer can be ignored, and the required phosphate fertilizer can be layered in the base fertilizer.
Fertilizers are available in water-soluble solid or liquid fertilizers. The current market is more solid fertilizer, powder or small block is preferred, such as ammonia, urea, ammonium sulfate, ammonium nitrate, potassium fertilizer can choose potassium chloride, potassium sulfate and potassium nitrate, calcium nitrate and other water-soluble The simple fertilizer containing less impurities generally does not use granular composite (mixed) fertilizer. Because the late topdressing is based on fertigation and water-flooding, it is not possible to use the method of soil-breaking fertilization. The granular compound fertilizer should be broken first and then dissolved, which is not worthwhile. However, the current granule compound fertilizer in the fertilizer market is mostly, which makes consumers have to use it. Case 1 is the case.
Control the total amount of topdressing and single dose: the amount of fertilizer should be refined, and more than one application, not only waste of fertilizer but also the eutrophication of groundwater and pollute the water environment. In particular, the amount of nitrogen fertilizer should be controlled, and the amount of single net nitrogen should be less than 2.5 kg.
Irrigation and fertilization is generally carried out in three steps. The first step is to first moisten the soil with clean water; the second step is to irrigate with the appropriate concentration of fertilizer water; the third step is to clean with water.
Source: Farmers Daily (Expert: Senior Consultant of Sinochem Fertilizer, Professor of China Agricultural University Cao Yiping)
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