Nongye Yun: "Liuqiu cabbage, hot summer picking new cotton"; "Head radish two-volt dish", it can be seen that Liqiu Qiqi is the season suitable for planting Chinese cabbage.
The goal of fertilizing Chinese cabbage is to achieve the dual purpose of combining high yield and quality. From the nutritional characteristics of Chinese cabbage, its demand for nitrogen, phosphorus and potassium is 1:0.5:1.2, indicating that its potassium requirement is greater than the nitrogen requirement. In the vegetable production, only the application of nitrogen fertilizer is generally paid attention to, and the balance supplement of potassium fertilizer is often neglected. There are three principles for fertilization of Chinese cabbage to grasp.
The application of nitrogen fertilizer should be appropriate
Practice has proved that the production of 1000 kg of fresh vegetables requires the absorption of about two kilograms of pure nitrogen from the soil. The nitrogen required for Chinese cabbage can come from soil, organic fertilizer and fertilizer. The application amount of the chemical nitrogen fertilizer should be appropriately reduced under the condition of applying a large amount of organic fertilizer. Applying appropriate amount of nitrogen fertilizer is beneficial to photosynthesis and is the key to achieving high yield of Chinese cabbage. In some remote areas, there may be insufficient supply of nitrogen fertilizer, the leaves are thin and pale, and the organization is rough, which not only affects the yield but also the quality.
However, in most areas, the actual nitrogen application rate exceeds the demand, while the excessive application of nitrogen fertilizer is not only rich in the outer leaves of Chinese cabbage, but also has poor core, low yield and quality, and the leaves have high water content and are not resistant to storage after harvest. It rots and is susceptible to pests and diseases in the later stages of growth. Therefore, in addition to the appropriate amount, the period of use of nitrogen fertilizer is also important.
In the whole growth period of Chinese cabbage, the nitrogen uptake at different stages is different. Seedling period is very small, accounting for about 2% of the total. The rosette period increased to about 28% of nitrogen, and the nitrogen uptake during the core period was the highest, accounting for about 70% of the total. Therefore, the application of nitrogen fertilizer should be light and heavy. Chinese cabbage has a longer growth period, and fertilization management should be applied to the base fertilizer.
In the old vegetable field, the soil fertility is high, and the appropriate amount of organic fertilizer can be applied. The compound fertilizer is mainly phosphorus and potassium. In the new vegetable field, it is necessary to re-apply organic fertilizer, combined with the application of ternary compound fertilizer, and also pay attention to the combined application of organic fertilizer and potassium fertilizer. In terms of topdressing application, Chinese cabbage should be controlled from water control (mainly nitrogen control) from seedling stage to sapling stage. In addition to special circumstances, it is necessary to apply seedling fertilizer. Generally, in the rosette stage, seedlings should be planted, and the ground assimilate organs (outer leaves) The growth is robust, and secondly, it promotes the growth of roots and the lowering of the roots, laying a foundation for the rapid growth and the absorption of nutrients in the later stage.
The first time the topdressing was in the key moment of the rosette period. It is advisable to apply quick-acting nitrogen and potassium fertilizers, and at the same time, watering, water and fertilizer will enter the core period. The second top dressing of Chinese cabbage is in the early and middle stages of the core, mainly applying nitrogen fertilizer, up to two times, to control the amount of nitrogen. Stop the application of nitrogen fertilizer at the end of the package.
Increase the proportion of phosphorus and potassium fertilizer application
The addition of potassium fertilizer in base fertilizer and top dressing is conducive to the cabbage and disease resistance of Chinese cabbage. In the early stage of the topping, it is necessary to pay attention to the application of potassium fertilizer. If the supply of phosphorus and potassium fertilizer is insufficient in the cabbage, it is not easy to form a ball. At present, in the production of vegetables, the application of potassium fertilizer is often ignored. The appropriate potassium application rate is generally 12 kg of potassium chloride per acre or 16 kg of potassium sulfide. The application method is preferably applied twice by base fertilizer and top dressing. The base fertilizer is applied to the bottom of the hole at the time of planting, and the top dressing is carried out after the end of the seedling stage, combined with the application of nitrogen fertilizer and irrigation.
Pay attention to the supply of calcium
The application of superphosphate by the base fertilizer supplements the nutrition of calcium, which is beneficial for preventing the occurrence of "dry heart" disease of Chinese cabbage. Chinese cabbage is a calcium-loving crop, and calcium deficiency, especially excessive nitrogen application, can cause dry heart disease. Controlling nitrogen fertilizer and supplementing calcium nutrition is the core technology to prevent the "dry heart" disease of Chinese cabbage. The method of calcium supplementation may be carried out by foliar supplementation in addition to the soil containing calcium fertilizer, and spraying 0.3% to 0.5% of calcium chloride or calcium nitrate.
This article URL: What are the precautions for fertilization of Liqiu cabbage?
Food Vacuum Sealers,Vacuum Sealer Bags,Vacuum Sealer Machine
Ningbo Shuangtuo International Trade Co., Ltd. , https://www.nbst-sports.com