Cabbage is an important leaf vegetable. Large white menu production is very high, up to more than 5,000 kilograms per mu, and therefore more demand for fertilizer. The ratio of the three is 1:0.4:1.1. Therefore, Chinese cabbage, like other leafy vegetables, has a particularly important significance for promoting the formation of hypertrophic green leaves and increasing the photosynthetic rate during the vegetative growth period. Due to different growth and growth rates of Chinese cabbage at different growth stages, the requirements for nutritional conditions are also different. The general laws of sucking up fertilizer are: Less nutrient absorption at the seedling stage, absorption of nitrogen, phosphorus and potassium is less than 1% of the total absorption: rosette period is obviously increased, its absorption accounts for about 30%; the absorption of the heart is the most, accounting for the total About 70% of the volume.
Fertilization technology points:
(1) Apply enough organic fertilizer to apply base fertilizer is the basis for the harvest of Chinese cabbage. In general, the soil fertility of old vegetable fields is relatively high, and organic fertilizers should be used in appropriate amounts. However, the soil fertility of new vegetable fields is not high. It is particularly important to reuse organic fertilizers and phosphate fertilizers as base fertilizers.
(2) Qiao Shi Miao Miao cabbage cotyledons grow, the main root has reached about 10 cm; and the occurrence of a lateral root, has the ability to absorb fertilizer, in the case of basal fertilizer is not enough or no fertilizer application, to apply a small amount Miao Fei, 5 per mu? D7 kg urea promotes growth. Fertilizer should focus on partial application of small seedlings, weak seedlings, and promote the formation of strong seedlings.
(3) Reasonable topdressing should generally catch the seedlings of the seedling tree and begin to enter the rosette period and start dressing twice before the top dressing, which is the key to ensure the high yield of Chinese cabbage. At this time, Chinese cabbage is in a period of rapid growth, and it is necessary to increase the amount of topdressing fertilizer, mainly nitrogen fertilizer, and apply N fertilizer and P and K fertilizers, or regularly apply water manure. During the growth period, the plant is sprayed with 1000-fold dilution of a plant-strengthened loquat (titanium citrate) or 0.5%? D1% urea and potassium dihydrogen phosphate mixture can increase the net vegetable rate of Chinese cabbage and increase the commercial value.
(4) Pay attention to applying 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. The amount of potassium applied is generally 20 kg of potassium sulfate or 15 kg of potassium chloride. In the absence of chemical potash, part of plant ash can be applied.
It should be pointed out that if the supply of nitrogen is insufficient during the growing season, the Chinese cabbage plants are short and the tissues are rough and severely reduced production. The Chinese cabbage is used with too much nitrogen and is not resistant to storage. As for the ball-type vegetables, if the supply of phosphorus and potassium is insufficient in the later period, it is often difficult to make the ball. Cabbage is a hi calcium crop. When poor environmental conditions occur physiological calcium deficiency, dry heart disease often occurs, seriously affecting product quality.
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