Improve Stem Mustard Yield Fertilization
Stem mustard (plaque) is a good crop for winter agricultural production, but in production it is found that once the farmers are transplanted, they do not pay attention to the post-fertilizer, which will lead to low yield. In general, the production of 1,000 kg of fresh stem tumors requires 5.4 kg of nitrogen, 1.4 kg of phosphorus, and 5.6 kg of potassium. To produce 3,000 grams of fresh stem tumors, about 16.2 kg of nitrogen, 4.2 kg of phosphorus and 16.8 kg of potassium are needed to be absorbed. The ratio of nitrogen, phosphorus and potassium requirements is 1:0.26:1.04.
The strong absorption period of nitrogen in stem mustard was 13 to 18 leaves. Phosphorus uptake in the whole growth period was in the 14 to 18 leaf stage, and the strong absorption period of potassium was in the 13 to 19 leaf stage. The rules for the absorption of N, P, and K by Brassica juncea differ from each other due to different climatic conditions and growing seasons. Brassica juncea fertilization can be divided into base fertilizer and top dressing.
Basal fertilizer is generally applied per acre rot 2000 to 3000 kg of organic fertilizer or 45% of compound fertilizer 60 kg. After spreading, the cultivator will plow into the soil, and then transplant and transplant.
The top-fermented mustard should be top-dressed according to different cultivation conditions and stem and leaf growth characteristics. The main nitrogen fertilizer, nitrogen fertilizer generally 25 ~ 30 kg per acre. Three applications.
For the first time after transplanting, the plants entered the 8-leaf stage (before December 15th) when the temperature was higher. The leaf grows fast, and only the top dressing can be formed in time to form the first leaf ring, which lays the foundation for the enlargement of the stem. Generally, 1,500 to 1,750 kilograms of manure is collected per mu, or 4 to 5 kilograms of urea, and 1,000 kilograms of water is added.
The second topdressing was carried out in the 13 leaf stage (middle of January to early February). At this time, the growth rate of stems and leaves was very fast. Generally, 25 kg of ammonium bicarbonate per mu, 20 kg of superphosphate, and 5 kg of potassium chloride were used per mu. Add water 1500 kg pouring.
The third time dressing is carried out in the 15 leaf stage (late February). 25 kg of urea plus 12.5 kg of potassium chloride per acre is added for water application. Do not apply or apply nitrogen fertilizer. Every 7 days, depending on the growth situation, follow up. 1 fat. One month before picking, stop top dressing to prevent growth from being too fast and hollow.
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