Chinese cabbage radish's fertilizer requirement law and fertilization method
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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, 5-7 kg of urea per acre, to promote 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 growing period, the foliar spraying of the plant-strengthened 901 (titanium citrate) or 0.5%-1% of urea and monobasic potassium dihydrogen phosphate diluted 1000 times on the leaf surface can increase the net vegetable rate of Chinese cabbage and improve Product 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.
Radish radish and carrots are all root vegetables. They are for human consumption with a fleshy, fleshy root. For each 1,000 kg of radish produced, 2.1-3.1 kg of nitrogen (N), 0.8-0.9 kg of phosphorus (P2O5) and 3.8-5.6 kg of potassium (K2O) should be absorbed from the soil. The ratio of the three is 1:0.2:0.8. It can be seen that radish is a good potassium crop.
The absorption of N, P and K in radish varies greatly during different growth stages. The amount of nitrogen uptake and the absorption of P and K in the seedling stage are generally low. In the early stage of root enlargement, the absorption of potassium by plants significantly increases, followed by Nitrogen and phosphorus reached the peak of nutrient absorption during the peak period of root enlargement. The nitrogen absorbed during this period accounted for 77.3% of the total amount of nitrogen absorbed during the whole growth period. Phosphorus uptake accounted for 82.9% of the total phosphorus uptake and potassium uptake accounted for the total. 76.6% of the potassium intake. Therefore, ensuring that adequate nutrition during this period is the key to the yield of radish.
Fertilization technology points:
(1) The basal fertilizer is generally more than 2,000 kg of fertilizer per mu, combined with the use of phosphorus and potassium fertilizers.
(2) The top dressing is based on the appropriate top-dressing in the early stage. When the radish breaks, the urea is applied 8-10 kg per mu. Nitrogen fertilizer application should not be too much, too late, it should be as far as possible before the application of radish swelling, if too much or too late, easy to make the root rupture or produce bitter taste, affect the quality of radish. Potassium fertilizers are also needed to increase the radish during the prosperous period. Also pay attention to nutrient balance. According to reports, application of three-component compound fertilizer than urea alone can increase yield of radish and improve its quality.