Cabbage is a potassium-promoting crop, but for a long time, local farmers have been blindly pursuing high yields to blindly increase the amount of nitrogen fertilizer without applying potash fertilizer, resulting in a decline in the quality of Chinese cabbage and affecting its storage and commercial quality. In cooperation with academicians and fertilizer institutes, from 2002 to 2004, a large number of experimental studies on reducing nitrogenous fertilizers and potash fertilizers were conducted, and the results were significant. At the time when cabbage was sown, it is hoped that the article will help farmers improve the quality of this year's Chinese cabbage.
First, the effect of potassium
1. The effect of increasing production is obvious. The test results showed that under the same conditions of nitrogen and phosphorus fertilizers, Chinese cabbage was increased with potassium fertilizer (50% potassium sulfate) 18 kg/mu, 2866 kg per mu higher than the control, and the yield rate was as high as 33.2%. The average yield of cabbage 159 kg per kg of potassium sulfate was increased. .
2. Improve disease resistance. The application of potash fertilizer can significantly increase the disease resistance of Chinese cabbage and reduce the incidence of disease. According to statistics, the incidence of disease caused by cabbage fertilizer application was only 1.9%, the incidence rate in the control area was 11.4%, and the incidence rate was reduced by 9.5%.
3. Improve the product rate of Chinese cabbage. The potash-causing Chinese cabbage was tightly packed, and there were few virtual leaves. The cabbage in the control area was not tight and the difference was obvious. In the winter storage, there are generally 3 tightly packed green leaves as the standard commercial vegetables. The rate of Chinese cabbage with potash fertilizer is 88.5%-91.2%, and that of the control area is 80%-83.1%. The addition of potash fertilizer increases the quality of cabbage products. Rate, thus improving economic efficiency.
4. Significantly improve quality. The experiment showed that the total K-fermented Chinese cabbage had a 31% increase in the total amount of 7 amino acids, a 4.2-mg/100-g vitamin C content, a 142-mg kg nitrate reduction, and enhanced storage stability.
Second, potassium method
1. Jishi: The Chinese cabbage produces more than 10,000 kilograms, requires 300-500 kilograms of refined organic manure, 300 kilograms of dried chicken manure, and 3 manure from manure, and then applies compound fertilizer (with 35% NPK content) Above), such as Sacred-rich potassium sulfate compound fertilizer with 30-40 kg; the above two kinds of fertilizer can be mixed and applied. Nitrogen fertilizer (46% of urea, 15 kg), phosphate fertilizer (14% of calcium superphosphate, 30 kg), and potassium fertilizer (50% of potassium sulfate, 12 kg) were used as compound fertilizer without compound fertilizer. It is best to concentrate on ditching, ridge up with soil, and sow cabbage seeds on ridges.
2. Topdressing: Fertilizer consumption during the Chinese cabbage period accounts for more than 60% of the total fertilizer requirement for the entire growth period. In addition to topdressing N fertilizer (20-25 kg of urea) in this period, another recovery of potassium sulfate is used. 7 kilograms were applied between the ridges and ditched and watered.
3. Foliar spraying: 0.2% potassium dihydrogen phosphate can be sprayed from the rosette stage to the ball stage, spraying once every 7-10 days, spraying 3 times in total, in the morning, evening or cloudy all day Sprayable.
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