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Lettuce has two kinds of leaves and stems. The former should be eaten raw, so it is called lettuce. The latter is called lettuce, which can be eaten raw, cooked, pickled and dried.
Lettuce develops rapidly on the organically rich, loosely ventilated soil, which is beneficial to the absorption of water and nutrients. Among the nutrients absorbed by lettuce, nitrogen plays a special important role. In any period, nitrogen deficiency can inhibit the differentiation of lettuce leaves, reduce the number of leaves, affect the assimilation, and reduce the yield of edible parts, especially in the early stage of growth, the effect of nitrogen deficiency. The most serious. Phosphorus deficiency at seedling stage, not only the number of leaves is small, but also the plant is short and the yield is reduced. Potassium deficiency has little effect on leaf differentiation, but it will affect the growth of lettuce. Therefore, for green leafy vegetables such as lettuce, it is still necessary to pay attention to the combined application of nitrogen, phosphorus and potassium.
According to the measurement, each 1000 kg of lettuce needs to absorb 2.08 kg of nitrogen, 0.71 kg of phosphorus pentoxide and 3.18 kg of potassium oxide from the soil.
The growth period of lettuce is short, and it should be based on base fertilizer, and it should be topdressed at the right time. The base fertilizer can be used for decomposing human and animal excrement, generally 1500 to 2000 kg per mu, and the application is turned into the soil. Before transplanting, re-water the diluted human and animal excrement, dry and smash the ground, so that the soil and fertilizer are fully mixed to achieve the purpose of full-layer fertilization.
Spinach fertilization technology
Spinach has wide adaptability and strong cold tolerance. Therefore, the cultivation mainly adopts the leaves of the assimilated organs to fully develop to obtain higher yield.
It has been determined that the production of 1000 kg of spinach requires absorption of 2.5 to 3.8 kg of nitrogen, 0.9 to 1.1 kg of phosphorus pentoxide, and 4.6 to 5.3 kg of potassium oxide.
The fertilization of spinach should be based on the principle of applying base fertilizer and supplementing topdressing. Use decomposed human or animal manure or heap fertilizer as base fertilizer to ensure good root development, especially wintering spinach. If the base fertilizer is not applied or the base fertilizer is insufficient, the seedlings will grow weakly, the cold resistance will be reduced, the mortality rate during wintering will be high, and the nutrition after returning to green. Insufficient growth is slow, affecting yield. After the wintering, the spinach chasing a quick-acting nitrogen fertilizer. If the soil available phosphorus and potassium are low, it can be combined.
Celery fertilization technology
Celery contains rich mineral salts, vitamins and volatile special substances.
Celery is a shallow root crop, and its ability to absorb nutrients is weak, so the soil moisture and nutrient requirements are strict. Adequate water and nutrients in the soil can enhance the assimilation of leaves and promote the development of underground roots, which will increase the tillering of the aboveground parts and increase the leaf area, and the number of leaves will increase. Water shortage and lack of fertilizer during the growth process tend to thicken the thick-angled tissue and rupture the parenchyma cells, causing hollowness and reducing quality. Nitrogen fertilizer is the most important nutrient in the whole growth process. It is the basic condition for ensuring the good growth of stems and leaves. The deficiency of nitrogen significantly affects the differentiation of leaves. Phosphorus is indispensable, especially in the seedling stage, the phosphorus is the most affected, but the phosphorus is too high, so that the leaves are slender, the fiber is increased, and the quality is lowered. Potassium is extremely important in the late growth stage of celery. Potassium not only has a role in the transportation of nutrients, but also makes the petiole thick and substantial, which is conducive to improving quality and increasing yield.
For each 1000 kg of celery, 2 kg of nitrogen, 0.93 kg of phosphorus pentoxide, and 3.88 kg of potassium oxide are required.
The growth period of celery is relatively long. Therefore, the base fertilizer should be applied before planting. The base fertilizer should be used for 2000 to 2500 kg of decomposed pig manure. After mashing, apply the field and then plow it into the soil. The soil surface layer is further applied with 1000 to 2000 kg of human excrement and ploughed into the soil. The application of 10 to 15 kg of urea and potassium chloride at the seedling stage can make the celery obtain sufficient nitrogen and potassium nutrition.
Source: Shanxi Science and Technology News 
Specifications
Common leafy vegetable fertilization technology
Lettuce fertilization technology
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Standards
Stainless Steel :
ASTM A182 F304/ 304L/ 304H/ 316/ 316L/ 317/ 317L/ 321/ 310/ 347/ 904L/ etc.
Carbon Steel :
ASTM A105/ A105N/ A694 F42/46/52/56/60/65/70 / A350 LF3/ A350 LF2, etc.
Alloy Steel :
ASTM A182 F1/ F5/ F9/ F11/ F22/ F91/ etc.