Rape soil testing formula fertilization technology
There are two types of rapeseed, cabbage and cabbage. Different types have different proportions of nitrogen, phosphorus, and potassium. The general cabbage type is 1:0.42:1.4 and the cabbage type is 1:0.44:1.1. 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 of Brassica napus had significant differences. They were 13.4%, 6.4%, and 12.3% of total absorption from seeding to the seedling stage, respectively. The total absorption was from seedling to bolting. 34.4%, 28.0%, and 37.6% of the total, 27.2%, 24.8%, and 28.9% of the total absorption from the bolting period to the initial stage, and 25.0% and 40.8% of the total absorption from the initial stage to the mature stage, respectively. 21.2%. With a yield of 150 kg of rapeseed per mu, it is generally required to use 500-1,000 kg of pig cattle calf, 40-50 kg of calcium magnesium phosphate fertilizer, 15-20 kg of potassium fertilizer, 25-30 kg of urea, 0.5 kg of boron fertilizer, and 1.0 kg of zinc fertilizer. The specific fertilization method is roughly as follows:
First, make good seedbed fertilizer. Seedbed fertilization must first foot base fertilizer, organic fertilizers which would be administered every 0.1 acres seedbed before planting maturity of 200-300 kg and 2 kg of urea, superphosphate 5 kg, 1 kg of potassium chloride, fertilizer and soil (10-15 cm thick) sowing after mixing. Combined with seedlings and Dingmiao, top dressing 1-2 times, topdressing with human and animal excreta as the main, and pay attention to the combination of fertilizer and water, in order to ensure strong seedlings transplanted, boron fertilizer can be sprayed once before transplanting, the concentration of 0.2%.
Second, apply base fertilizer. 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." One day before transplanting rapeseed, basal fertilizer was applied. Generally, 500-1000 kilograms of pig manure, 40-50 kilograms of calcium magnesium phosphate, 15-20 kilograms of urea, 7-10 kilograms of potash, 0.5 kilograms of boron fertilizer, and zinc fertilizer were used. 1.0 kg mixed evenly buried.
Before fertilizing, various fertilizers should be thoroughly mixed. 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 calcium superphosphate. 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, it is necessary to cover the soil to prevent the loss of nitrogen volatilization.
After the basal fertilizer is applied, the rapeseed seedlings can be transplanted. When transplanting, it is not appropriate to directly plant the rapeseed on the fertilization point, and it is forbidden to contact the roots of the rape seedlings with the fertilizer.
Third, apply fertilizer. Rapeseed top dressing is generally divided into two. The first topdressing was carried out about 50 days after transplanting, that is, before the wintering period of rape seedlings, the topdressing application of urea was 4-6 kg/mu and potassium chloride was 4.0-5.0 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 was applied during the spring period after the beginning of spring. Mushi urea 4.0-6.0 kg and potassium chloride 4.0-5.0 kg were applied. At this point the rape has been sealed, can only be applied on the surface, be sure to spread evenly, it is best to choose to sprinkle before the rain.
Fourth, spray foliar fertilizer. After the flowering period, foliar fertilizer should be sprayed in time to promote the photosynthesis of functional leaves. Can be combined with drug, spray once a week, 0.2% of potassium dihydrogen phosphate and 1-2% of 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.