Effect of potassium fertilizer on vegetables

Potassium is one of the three elements of fertilizer. Many vegetables require more potassium than nitrogen and phosphorus. Most vegetables absorb more potassium than nitrogen. For example, the ratio of nitrogen to potassium absorbed by cucumber is 1: (1.5-1.7). : 2.1, tomato is 1:1.9, eggplant is 1: (1.5-1.65), green pepper is 1:1.3, carrot is 1: (1.1-1.3), radish is 1: (1.1-1.35), onion is 1: ( 1.1-1.4), lettuce is 1: (1.6-1.9), and cabbage is 1: (1.1-1.3).
The conventional potassium application rate is 0.8-1.5 times of the vegetable absorption. Most vegetables use the same amount of nitrogen, phosphorus and potassium as the base fertilizer. Generally, 10-15 kg of potassium oxide is applied per 667 M2, but the potassium fertilizer must be increased while increasing the nitrogen fertilizer. The amount used. For vegetables with large potassium content such as solanaceous fruits and melons, we must also pay attention to increasing the proportion of potassium fertilizer, and in the case of base fertilizer application, the potassium fertilizer should be applied in a timely manner. It is better for fruit and vegetables to use 50% to 60% of the total potassium application.
There are many types of potash, and different types of potash have different application methods. Commonly used potassium fertilizers include potassium chloride, potassium sulfate, potassium magnesium fertilizer and grass ash. Potassium chloride and potassium sulfate are physiologically acidic fertilizers and should be applied in combination with lime and organic fertilizer. It is not advisable to apply potassium chloride and potassium magnesium fertilizers with higher chlorine content for the avoidance of chlorine by potatoes. Potassium magnesium fertilizer is suitable for acidic soils. The grass ash is suitable for vegetable seedlings, which not only supplies nutrients, but also absorbs heat to increase the surface temperature of the soil and promotes early emergence of seedlings. In addition, 1% straw ash leaching solution is used as top dressing for roots, which also has a good effect on controlling vegetable mites. According to the test, the application of acupoint application, ditch application and strip application is better than application. Generally, potassium is applied 10cm near the root of the vegetable, so that the root can be prevented from being burned and the potassium absorption of the plant is facilitated.
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