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1. Fertilizer characteristics of cabbages According to research data, each ton of fresh cabbage needs to absorb 4.1-4.8 kg of pure nitrogen, 1.2-1.3 kg of phosphorus pentoxide, 4.9-5.4 kg of potassium oxide, and pure nitrogen during the whole growth period. The absorption ratio of phosphorus pentoxide and potassium oxide is 3:1:4, and the demand for potassium exceeds the demand of nitrogen, which is highly dependent on nitrogen and potassium nutrition. The cabbage needs more nitrogen during the seedling stage, and the potassium requirement during the ball-forming period is 70%-80%. The imbalance in the amount and proportion of the two fertilizers will lead to a decrease in the yield and fertilization efficiency of the cabbage.
2. Nutritional function of potassium Potassium plays an important role in the growth and development of cabbage. Potassium can promote the photosynthesis of Baolai, affect the synthesis and transportation of sugar, and enhance the resistance of cabbage to disease and insects and drought resistance. The leaves of potassium-deficient cabbage are yellow, the leaf margins are atrophy, the individual is short, the development is poor, the heart is poor, the pests are serious, the yield is low, and the quality is poor.
3. Potassium Fertilizer Increased Production Effect - Co-operation Anhui Province Balanced Fertilization Demonstration Project Field trial results show that in the Huaibei Plain Shajiang Black Soil, cabbage and corn were planted year after year, and potassium deficiency was observed without potassium application. Potassium fertilizer was applied. Significant increase in production and income and improved quality, and has a significant aftereffect. In 1998-1999, the application of different nitrogen and potassium ratio fertilizers increased the economic yield of cabbage by 28.2%-43.2%, the average yield increased by 36.66%, and the biological yield increased by 30.3%-36.9%, with an average of 33.36%. In 1999-2000, the application of different proportions of nitrogen and potassium fertilizers increased the yield of spring cabbage by 35.5% - 50.1%, the average yield was 40.5%; the yield of corn increased by 85.4%-115.9%, with an average of 103.2%. In 2000-2001, compared with the control, the yield increase of potassium application, winter cabbage and spring bun was 39.4% to 59.1% and 35.5% to 50.1%, respectively. The corn is 9.6%-24.5%, and the average yield increase is 50.48.92%, 29.88% and 17.38%.
4. The effect of potassium on the improvement of Baoxinlai quality and the benefits of seedlings. Potassium fertilizer can increase the content of vitamin C and soluble sugar in cabbage, improve the quality and increase the income of farmers. The vitamin C content increased by 7.60%-2l2%, and the water-soluble sugar content increased by 4.26%-29.0%. Increasing the application of potassium fertilizer can greatly increase the annual output value of the planting model, increasing the income per hectare by 5057.6-7178.9 yuan, and the ratio of production and investment of potassium application is 3.1:5.47:1.
5. Potassium Fertilizer Application Medium-fertile land, based on the application of 15-20 kg of pure nitrogen and 6 kg of phosphorus pentoxide per acre, the appropriate application rate of potassium fertilizer per acre is 15-20 kg of potassium oxide, equivalent to potassium chloride. (potassium oxide content 60%) 25-35 kg. In the Jianghuai and Yanjiang areas, due to the low potassium content of the soil, the amount of potassium fertilizer can be appropriately increased. The application method is to mix the fertilizer with the other fertilizers before the transplanting of the cabbage.
High-yield and high-efficiency potassium application technology for cabbage
Under the condition of partial application of nitrogen fertilizer or nitrogen and phosphorus fertilizer, no or little application of potassium fertilizer, the yield and quality of cabbage were reduced, which affected the improvement of economic benefits and the enthusiasm of farmers. Therefore, the promotion and application of balanced fertilization technology based on the application of potash fertilizer has a positive effect on the development of cabbage production and the development of “high-yield, high-quality and high-efficiency agricultureâ€.
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