How to scientifically topdress the Chinese cabbage field
The cabbage field should be based on the re-application of nitrogen fertilizer. The use of fertilizer should master the principle of “light before and then heavyâ€. The top dressing should be carried out in 2~3 times. The first top dressing should be in the early stage of the rosette, applying 10~15 kg of urea per mu. The potassium sulfate is 5~10 kg, and the new high-fat film 800 times liquid is sprayed to increase the utilization rate of the effective components of the nutrient. In the ball-forming period, ternary compound fertilizer is generally used, and the dosage per acre is about 50 kg, and the application is performed twice in the initial and middle stages of the ball. At the same time, it should be applied by foliar application. It can be sprayed with 0.3%~0.5% calcium chloride to apply 800 times liquid of new high-fat film. Once every 7 days, it can be controlled for 2~3 times in a row, and the application of micro-fertilizer can be applied. Boron is more sensitive, and the lack of boron fertilizer has a greater impact on yield. For boron-deficient soils, boron fertilizer should be applied. Boron fertilizer can be used as base fertilizer, 1 kg of borax per acre, mixed with other fertilizers, and applied to the soil. If the base fertilizer and boron fertilizer are insufficient, spray 0.1%~0.2% borax solution and 800 times liquid of new high fat film in the rosette agricultural technology period to the ball-forming period, spray once every 6~7 days for 2~3 times, and The timely application of strong stems in the growth period of Chinese cabbage can make the stems of the plants thick, the leaves are thick, the leaves are fresh and tender, the plants are flourishing, and the natural taste is strong. At the same time, it can improve the ability to resist disasters, reduce the amount of pesticides and fertilizers, and reduce residual poisons.
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