Qiu Cabbage must pay attention to water and fertilizer management to ensure a good harvest. The Chinese cabbage has a high yield and needs a large amount of fertilizer. It is necessary to reasonably top-dress fertilizers on the basis of applying basic fertilizer. Top dressing depends on different growth periods and seedlings. Seedlings are generally not top-dressing. If the base fertilizer is insufficient, the first time in the 3-4 true leaf stage, ammonium sulfate 8-10 kg per acre, applied to the seedlings on both sides, and immediately watering, which is raised seedlings. After the second seedling transplanting or seedling transplanting, 15 kg of ammonium sulfate per acre was applied to the ditch on both sides of the ridge, which was called a tree-fertilizer. The third time during the rosette period, 20 kg of ammonium sulfate and 10 kg of superphosphate were applied per mu, and the fertilizer was applied into the ditch or inside the hole, and then the soil was ridged with a little earth and then watered, which was called large top dressing. The fourth time in the middle of the ball, 15 kg of ammonium sulfate per acre can be applied with water. This is called heart filling. During the period from Chinese cabbage to rosette, the temperature of the cabbage is gradually reduced and the weather is mild. Here, it can be properly watered. The lotus can be properly controlled for a few days at the end of the rosette and watered after the third topdressing. After entering the ball stage, Chinese cabbage needs the most water. Therefore, once the seedlings are finished, they must be poured once. Then the second water is poured every 3-4 days. This water is very important. At this time, if the soil is cracked, the lateral roots will break and the fine roots will die, affecting the ball. Afterwards, it is usually poured once a week or so to keep the soil moist.
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