(1) Apply organic fertilizer. Applying basal fertilization 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 applied in an appropriate amount. For new vegetable lands with low soil fertility, it is important not only to re-apply organic fertilizers, but also to mix them with phosphatic fertilizers as base fertilizers.
(2) Qiao Shi Miao Fei. After the cotyledon of Chinese cabbage grows, the main root has reached about 10 centimeters, and a lateral root has emerged. It has the ability of absorbing water and absorbing fertilizer. Under the condition of insufficient base fertilizer or no application of fertilizer, a small amount of seedling fertilizer should be applied per hectare. 75-105 kg urea to promote seedling growth. Fertilizer should focus on partial application of small seedlings, weak seedlings, and promote the formation of strong seedlings.
(3) Reasonably top-dressing. Should generally grasp the early stage of the rosette and the top two packages of fertilizer. This 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. It should be dominated by nitrogen fertilizer and be applied with P and K fertilizers, or be regularly applied to people, livestock, and poultry manure. In the late rosette and leaf ball formation period, attention should be paid to controlling nutrients, and appropriate seedlings should be planted to prevent the leaves of the rosette from becoming long and delaying the formation of leaf ball. The initial requirement for nitrogen nutrients is particularly high, and topdressing should be repeated. Generally, 90-120 kg nitrogen (N) is applied per hectare, and 150-225 kg chemical potassium fertilizer is applied at the same time. In the mid-balloon stage, in order to extend the function of the outer leaves and delay the aging of the leaves, the top-dressing can be appropriately performed according to the soil fertility.
In short, the early Chinese cabbage cabbage ball is a highly efficient fertilization period, which has a decisive effect on the yield. At this time, top dressing is more important than the seedling, rosette, and mid-balloon re-fertilizer.
During the growing period, the foliar spraying of the plant-owned 891 plant promoting factor (3.4% citrate aqueous solution) or 0.5% to 1% of urea and potassium dihydrogen phosphate diluted on the foliar spray 1000 times can improve the net of Chinese cabbage. Rate, increase commodity value.
(4) Pay attention to the application of potash fertilizer. Potassium fertilizer can increase the disease resistance and storage stability of Chinese cabbage, but potassium fertilizer is often neglected in production. Typically hectares of potassium sulfate or 300 kg of potassium chloride 225 kg. If there is a shortage of chemical potash fertilizer, it can be applied with ash equivalent of potassium.
It should be pointed out that if the supply of nitrogen is insufficient during the growth period, the Chinese cabbage plants are short and the tissues are rough and will severely reduce the yield. On the contrary, if nitrogen is used excessively, it will not survive the 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 calcium-bearing crop. When physiological conditions cause physiological calcium deficiency, dry heart disease often occurs, which can seriously affect product quality. If necessary, 0.3% calcium chloride solution or 0.25% to 0.5% nitric acid can be sprayed. Calcium solution can reduce its incidence.
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