Due to the short growing period of spring cabbage, most of the vegetable growers have never been top-dressing from the cabbage planting to the harvest, so that the cabbage has a poor heart, which affects its commodity nature. Therefore, to remind farmers, should be based on the growth stage of cabbage cultivation fertilizer. First, Qiaoshui water, promote cabbage heart Farmers should appropriately increase the amount of phosphorus and potassium fertilizers when topdressing, which is not only beneficial to the tightness of Chinese cabbage, but also improves the disease resistance of Chinese cabbage. In general, Chinese cabbage can be harvested 3 times from the lotus stage to the harvest. The first application of fertilizer in the rosette stage can be followed by 15-20 kilograms of phos phos- phorus or 5-10 kilograms of urea per acre, which promotes the growth of outer leaves, improves photosynthesis, and lays a good foundation for package well-being. The nodule period is a critical period for the formation of product organs. If this period of defertilization directly affects the cohesion of the heart and leaves, reduces the tightness of the heart, affects the yield and quality, the vegetable farmer can apply 15 kg of urea per acre at the beginning of the ball and 10 kg of potassium sulfate. In the mid-balloon, the outer leaves almost no longer grow. At this time, potassium nitrate can be applied to 10 kilograms per acre to promote the heart. Second, reduce the humidity, prevent dead trees The majority of the spring cabbage is heading along the shed and planting cabbage, and the dumplings are generally long, and some even exceed 100 meters. Such a long dumpling, a long time to pour a cabbage, a large amount of water, coupled with the second film within the shed, will cause poor ventilation within the chamber, resulting in a larger humidity inside the greenhouse, cabbage is vulnerable to rot and dead trees . In this regard, it is recommended that when the watering of the vegetable farmer should be done in the sunny morning, the amount of water should be small, do not pour water. Spray fungicide again before watering for 2-3 days. After watering, pay attention to increase ventilation and reduce humidity. When the individual plants become infected, timely irrigate the roots with 72.2% Prec 800x, 72% Kelu or Jinlei 1000x, or spray the stem base of the plant and the surrounding soil. If the sensible parts have odor, then the infection will occur. Bacterial diseases can be added by spraying medicated bacteria such as mesobiocin and yetazole to prevent and control bacteria. The disease prevention effect is better. The current greenhouse conditions are also conducive to the occurrence of cabbage downy mildew, vegetable farmers can use Prec 800 times or 600 times the frost urea manganese zinc spray control. SMART Digital Bluetooth Hearing Aids SMART Digital Bluetooth Hearing Aids Shenzhen Sunshine Technology Co.,Ltd , https://www.yatwinsz.com