Cabbage Chinese cabbage is an important leafy vegetable. The large white menu is very high, reaching more than 5,000 kg per mu , so there are more requirements for fertilizer. The ratio of the three is 1 : 0.4 : 1.1 . Therefore, Chinese cabbage is the same as other leafy vegetables. During the vegetative growth period, sufficient nitrogen nutrition is particularly important for promoting the formation of hypertrophic green leaves and increasing photosynthetic rate. Because of the different growth and growth rates of Chinese cabbage in different growth stages, the requirements for nutritional conditions are also different. The general rules of fat absorption are: less nutrient absorption at seedling stage, less than 1% of total absorption of NPK : the increase in the rosette period, the absorption amount accounts for about 30% ; the absorption during the core period is the most, accounting for the total About 70% of the amount .
    Fertilization technology points:
    ( 1 ) Applying organic fertilizer to the base fertilizer is the basis for obtaining a good harvest of Chinese cabbage. Generally, the soil fertility of old vegetable fields is high, and the application of organic fertilizer should be appropriate; while the soil fertility of new vegetable fields is not high, it is particularly important to re-apply organic fertilizer and phosphate fertilizer as base fertilizer.
   ( 2 ) After the sprouting of the Chinese cabbage leaves, the main root has reached about 10 cm; and the first-level lateral roots have been produced, which has the ability to absorb water and absorb fertilizer. In the case of insufficient base fertilizer or no fertilizer application, a small amount should be applied. The seedling fertilizer, 5-7 kg urea per acre , promotes its growth. When applying fertilizer, it is important to apply small seedlings and weak seedlings to promote the formation of strong seedlings.
   ( 3 ) Reasonable topdressing should generally grasp the seedlings of the seedlings and start to enter the rosette period and start the top dressing twice before the start of the core, which is the key to ensure the high yield of Chinese cabbage. At this time, Chinese cabbage is in a rapid growth period, and the amount of topdressing should be increased. Nitrogen is the main factor, nitrogen fertilizer is combined with phosphorus and potassium fertilizer, or water feces are applied regularly. During the growth period, foliar application of 1000 times diluted plant 891 plant growth factor (titanium citrate) or 0.5%-1% urea and potassium dihydrogen phosphate mixture can increase the vegetable yield of Chinese cabbage and improve Commodity value.
( 4 ) Emphasis on the application of potassium fertilizer to increase potassium fertilizer can enhance the disease resistance and storage resistance of Chinese cabbage, but the application of potassium fertilizer is often neglected in production. Generally, the amount of potassium applied is 20 kg of potassium sulfate or 15 kg of potassium chloride . In the absence of chemical potassium fertilizer, part of the plant ash can be applied.
It should be pointed out that if the supply of nitrogen in the growing season is insufficient, the Chinese cabbage plant is short, the tissue is coarse and hard, and the yield is severely reduced. The nitrogen fertilizer of Chinese cabbage is too much and is not resistant to storage. For the type of ball-forming vegetables, if the supply of phosphorus and potassium is insufficient in the later stage, it is often difficult to form a ball. Chinese cabbage is a calcium-loving crop. When physiological calcium deficiency occurs in adverse environmental conditions, dry heartburn often occurs, which seriously affects product quality.
Radishes and carrots are root vegetables. They are served by people with large fleshy roots. For every 1000 kilograms of radish produced , it is necessary to absorb nitrogen ( N ) from 2.1 to 3.1 kg, phosphorus ( P2O5 ) from 0.8 to 0.9 kg, and potassium ( K2O ) from 3.8 to 5.6 kg. The ratio of the three is 1 : 0.2 : 0.8 . It can be seen that the radish is a potassium crop.
     The absorption of NPK in radish varies greatly in different growth stages. Generally, the amount of nitrogen uptake is higher in seedling stage, and the amount of phosphorus and potassium is less. In the early stage of succulent root enlargement, the absorption of potassium by plants is significantly increased, followed by nitrogen and phosphorus, into the fleshy root enlargement nutrient absorption peak is the peak of this period the nitrogen absorbed 77.3% of the total nitrogen absorption whole growth period, 82.9% of the total phosphorus uptake P uptake, the total amount of potassium absorption The amount of potassium absorbed was 76.6% . Therefore, ensuring adequate nutrition during this period is the key to high yield of radish.
      Fertilization technology points:
     ( 1 ) The base fertilizer is generally more than 2000 kg per mu , and combined with phosphorus and potassium fertilizer.
     ( 2 ) On top of the appropriate topdressing in the early stage, when the radish breaks the belly, it is combined with irrigation to apply urea 8-10 kg per mu . Nitrogen application should not be too much or too late, should be applied before the radish enlargement period. If the application is too much or too late, the fleshy roots may be broken or bitter and affect the quality of the radish. Potassium fertilizer needs to be added during the swell of radish. In addition, attention should be paid to nutrient balance. It has been reported that the application of ternary compound fertilizer can increase the yield of radish and improve its quality than single application of urea.
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