Chinese cabbage is usually the main leafy vegetable that is eaten by northerners for half a year. The goal of fertilization is to achieve both the high yield and the high quality. According to the nutritional characteristics of Chinese cabbage, its ratio of nitrogen, phosphorus, and potassium is 1:0.5:1.2, indicating that its demand for potassium is also greater than the demand for nitrogen. The actual production of Chinese cabbage generally pays attention only to the fertilization of nitrogen fertilizers, and often neglects the balance of potassium fertilizers. Considering the fertilization status of Chinese cabbage in recent years, we must grasp three principles.
Appropriate application of nitrogen fertilizer The main problems in the current fertilization of Chinese cabbage are: blind application of nitrogen fertilizer is serious, one-time fertilizer is too large, resulting in loss of nitrogen fertilizer, calcium absorption was blocked. The principle of fertilization should be based on soil fertility conditions, optimize the amount of nitrogen, phosphorus, potassium fertilizer, base fertilizer-based, base fertilizer and top dressing combined. Nitrogen is the main nitrogen fertilizer, and nitrogen, phosphorus, and potassium are combined to supplement trace elements. It is planned to produce 3,500-4,500 kilograms of Chinese cabbage per acre and apply 2,000 kg of organic fertilizer, 15-20 kg of pure nitrogen, 4-6 kg of phosphorus (P2O5) and 14-20 kg of potassium (K2O); 6000 kg, 3000 kg of organic fertilizer, 18-23 kg of pure nitrogen, 5-8 kg of phosphorus (P2O5), 16-202 kg of potassium (K2O), organic fertilizer and phosphorus, 30% potassium fertilizer as base fertilizer, and 70% nitrogen and potassium fertilizer Separately in the rosette period and the center of the package before the chase. For the high quality and high yield of Chinese cabbage, how much nitrogen fertilizer is applied? Production practice shows that for every 1000 kilograms of fresh vegetables produced, about 2.0 kilograms of pure nitrogen need to be absorbed from the soil, and 5000 kilograms of fresh vegetables need to absorb 10 kilograms of pure nitrogen, which can come from soil organic fertilizer and fertilizer. In the application of large amounts of organic fertilizer under the conditions should reduce the amount of chemical nitrogen fertilizer. The application of appropriate amount of nitrogen fertilizer has a good effect on the growth and development of Chinese cabbage and is beneficial to photosynthesis. It is the key to achieving high yield and quality of Chinese cabbage. In some remote areas, there may be insufficient supply of nitrogen fertilizers, thin pale leaves, and rough structures, which not only affect the yield but also have poor quality. However, the actual amount of nitrogen used in the production of most Chinese cabbages far exceeds the demand. Excessive application of nitrogen fertilizer not only leaves the outer leaves of the Chinese cabbage thick, but also has poor package quality, low yield and quality, and the leaves have large water content. Resistance to storage, easy to rot, to the late growth is susceptible to pests and diseases. Therefore, in addition to the appropriate amount, the use of nitrogen fertilizer is also very important. In the whole growth period of Chinese cabbage, the amount of nitrogen absorption in different stages is also not the same. The seedling period is very small, accounting for about 2% of the total, and the rosette period increases to about 28% of nitrogen. The nitrogen uptake during the core period is the highest, accounting for about 70% of the total. Therefore, the application of nitrogen fertilizer to be applied in stages, reflecting the former light and heavy.
To increase the ratio of phosphorus and potassium fertilization and increase potassium fertilizer in base fertilizer and top dressing is beneficial to the Chinese cabbage's core and disease resistance. Pay attention to the application of potash fertilizer in the top-dressing fertilizer, cabbage Chinese cabbage if the phosphorus, potassium supply is insufficient, it will not be the ball. At present, potassium fertilizer is often neglected in vegetable production. The appropriate amount of potassium is generally 16 kg of potassium sulfate per acre. The best method of application is to divide the basal and top dressings in two applications: the basal fertilizer is applied to the bottom of the burrows during the colonization, and the top dressing is performed after the seedlings are terminated in the rosette stage, combined with topdressing nitrogen fertilizer and irrigation.
To ensure that the supply of calcium is supplemented with calcium superphosphate by the use of base fertilizer, it is very beneficial to prevent the occurrence of "disease heart" disease of Chinese cabbage. Cabbage is a hi calcium crop, calcium deficiency, especially excessive nitrogen easily cause "heartburn." Controlling nitrogen fertilizer and supplementing calcium nutrition are the core technologies for preventing Chinese cabbage "dry heart" disease. The method of calcium supplementation, in addition to the application of calcium fertilizer at the end, can also adopt the method of foliar spraying, spraying 0.3%-0.5% calcium chloride or calcium nitrate per 10-15 days, and the efficacy can reach 95%. the above.
Apple Powder is a kind of Apple extract and a Fruit&Vegetable Power of our company. It is a light yellow
Powder , concentrated and dried from Apple fruits.
Apple is the apple of the apple subfamily of the Rose family, the tree is deciduous trees.Apple nutritional value is very high, rich in minerals and vitamins, rich in calcium, help to metabolize excess salt in the body, malic acid can metabolize
heat, prevent obesity in the lower body.Apple is a kind of food with low quantity of heat, produce the quantity of heat of 60 kilocalorie or so every 100 grams.
There are hundreds of apple varieties, which are divided into three categories: wine varieties, cooking varieties and fresh food varieties.The three varieties differ in size, color, aroma, smoothness (and perhaps brittleness, flavor) and other characteristics.Many varieties are high in sugar, moderate in acidity and low in tannin.In addition to being eaten raw, apples can be prepared in a variety of ways. They are often used as pastry fillings. Apple scones are probably the first American sweet.Fried apple often with sausage, pork chops and other dishes with food, especially in Europe is particularly common.The latest taxonomic evidence suggests there are just 38 species in the genus Apple.
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