At present, rapeseed will enter the stage of strong growth of bolting, which is the key period of field management. In view of the fact that rapeseed is generally frozen, leaves are dry and yellow, local rapeseed is thin, growth is slow, and seedlings are different. The early spring rapeseed field should adopt the following technical measures:
Watering and filling. At present, the temperature has risen, and rapeseed has begun to enter a vigorous growth stage. Watering can replenish soil moisture and meet the needs of rapeseed growth. Due to the dry land, it is necessary to pour water in mid-February, and it is advisable to water it from 10:00 am to 3:00 pm. Generally, the watering amount per acre is 30 to 50 squares, so as to ensure that the water is poured in one time and the bottom water is made up.
Apply moss fertilizer early. Moss fertilizer is applied before rapeseed or when bolting is started. It can make rapeseed spring and steady, and there are many strong branches. To combine watering or sputum application of moss fertilizer. Apply 12-15 kg of ammonium sulfate per acre or 5-7 kg of urea. For rapeseed with poor seedling growth and serious freezing damage, it should be applied early and applied.
Apply boron fertilizer. Spraying boron fertilizer in the early stage of bolting can avoid "flowers and falsehood" and increase the seed setting rate. Spraying 0.1-0.2 borax aqueous solution 60 kg/mu (times) at the beginning of bolting, or spraying 50 grams of instant boron fertilizer (liquid boron fertilizer) with water, the effect is better. In the case where the bottom fertilizer is not applied with boron fertilizer, the effect of increasing the production of boron outside the root is more prominent. Spraying phosphorus can increase the grain weight and increase the oil content. The concentration of phosphorus spray is 1-2%, 60 kg per acre of spray liquid, spray once every 7 days, and spray 2 times continuously. Currently, the boron fertilizers sold on the market mainly include borax and boric acid. They are white crystals or powders. Generally, they are difficult to dissolve in cold water. They are easily soluble in hot water at 40 °C. Pay attention to the correct method when spraying. In order to improve the spraying effect of boron fertilizer. Before bolting to flowering (not later than the initial flowering period), especially in the field of oil-cotton seeding (planting), it is necessary to pay attention to spraying boron fertilizer.
Clean up the "three ditch". After the spring, the rainwater increases, and the rapeseed field is susceptible to waterlogging. In conditional areas, it is necessary to seize the favorable opportunity before the closure of the line, cultivating the soil, clearing the weeds, enhancing the lodging resistance of the plants, reducing the number of sclerotia and reducing the damage of the sclerotium disease. Promote the growth of rapeseed. Combined with cultivating, clean up the "three ditch" to ensure the need for irrigation and drainage.
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