1, make a good seedbed fertilizer. The seedbed fertilization must first apply the base fertilizer. The specific approach is to apply 200 to 300 kg of decomposed high-quality organic fertilizer before sowing for each 0.1-mu seedbed, and 2 kg of urea, 5 kg of superphosphate and 1 kg of potassium chloride. Soil (10 cm to 15 cm thick) is sown after mixing. Combine with seedlings and Dingmiao, topdressing 1 or 2 times, topdressing mainly with human and animal excreta, and pay attention to the combination of fertilizer and water, in order to ensure strong seedlings transplanting, boron fertilizer can be sprayed once before transplanting, with a concentration of 0.2%.
2, Shizuji Fei. The general principle of the application of basal fertilizer is "the quantity should be sufficient, the variety should be complete, and the time should be appropriate." In the 1st day before transplanting, the basal fertilizer was applied in the hole, generally 500 to 1000 kg of pig cattle calf, 40 to 50 kg of calcium magnesium phosphate fertilizer, 15 to 20 kg of urea, 7-10 kg of potassium fertilizer, 0.5 kg of boron fertilizer, and zinc fertilizer. 1.0 kg mixed evenly buried.
Before fertilizing, all kinds of fertilizers should be fully mixed. This mixing process is a self-made rapeseed special fertilizer process. The specific approach is to first mix a large number of elemental fertilizers (nitrogen, phosphorus and potassium), and then add trace element fertilizers (boron fertilizer and zinc fertilizer). In the process of fertilizer mixing, urea may react with superphosphate to infiltrate water. Therefore, when superphosphate is used as phosphorus fertilizer, superphosphate may be finally mixed in or applied separately. After the fertilizer is mixed, it should be used immediately, that is, it is used with it. After the fertilizer is applied, the soil shall be covered with nitrogen to prevent evaporation loss.
After the basal fertilization is applied, rape seedlings can be transplanted. When transplanting, it is not appropriate to directly plant rapeseed on the fertilization point. It is forbidden to contact the roots of the rapeseed with fertilizer so as to avoid the high concentration of fertilizer and the phenomenon of seedlings being killed.
3, apply good fertilizer. Rapeseed top dressing is generally divided into two.
The first top-dressing was carried out about 50 days after transplanting, that is, before the wintering period of rape seedlings, the topdressing application of urea was 4 to 6 kg/mu and potassium chloride was 4.0 to 5.0 kg/mu. The fertilization method is to apply the soil in combination with the cultivator. If the cultivator is not used for cultivating, a small ditch with a depth of 10 cm can be opened between the rows. Mix the two fertilizers and apply them. After fertilization, cover the soil.
The second top-dressing is applied during the period of moss-raising after spring, and Mushi urea 4.0-6.0 kg and potassium chloride 4.0-5.0 kg. Because the rape has been sealed at this time, the operation is inconvenient, and it can only be applied on the surface. Be careful to spread it evenly. It is best to use it before raining.
4, spray foliar fertilizer: After the flowering period, it is timely to spray foliar fertilizer, promote the photosynthesis of functional leaves. Can be combined with drug, spray once a week, 0.2% potassium dihydrogen phosphate and 1 ~ 2% urea solution, a total of 2 times, the base fertilizer is not applied to the field of boron fertilizer and zinc fertilizer, should be combined with the spraying of foliar fertilizer, Use 0.2% borax and 0.2% zinc sulfate solution.
Rape soil testing formula fertilization technology
There are two types of rapeseed, cabbage and cabbage. Different types of nitrogen, phosphorus (P2O5) and potassium (K2O) absorption ratios are different. The general cabbage type is 1:0.42:1.4 and the cabbage type is 1:0.44: 1.1, Brassica type fertilizer is generally more than 30% higher than the cabbage type, the yield is higher than 50%, and the demand for potassium in cabbage-type rape is significantly higher than the cabbage type. Below is a description of the requirements for fertility and fertilization techniques for B. napus. The absorption of N, P, and K at different growth stages in B. napus had significant differences, accounting for 13.4%, 6.4%, and 12.3% of the total absorption at seeding and seedling stage, respectively, and the total absorption at the seedling and bolting stages, respectively. 34.4%, 28.0%, and 37.6% of the total, 27.2%, 24.8%, and 28.9% of the total absorption during the bolting period and the first stage, respectively, and 25.0% and 40.8% of the total absorption during the period from the first stage to the mature stage, respectively. 21.2%. According to the characteristics of the growth and development of rapeseed and the law of fertilizer demand, the production of 150 kilograms of rapeseed per mu, generally requires 500 to 1,000 kilograms of pig cattle cattle, 40 to 50 kilograms of calcium magnesium phosphate fertilizer, 15-20 kilograms of potassium fertilizer, urea 25 to 30 kg, 0.5 kg of boron fertilizer and 1.0 kg of zinc fertilizer. The specific fertilization method is roughly as follows: