After the beginning of spring, winter rapeseed enters a period of vegetative growth and reproductive growth. It needs to absorb large amounts of nutrients. It should be based on soil quality, climate and fertilization before spring, combined with the conditions of the seedlings for scientific fertilizer.
Early application of spring fertilizer early spring fertilizer can remedy the lack of winter rapeseed growth, promote more branches, early buds. In particular, the shortage of basal fertilizer and the failure to apply wax fertilizer to rapeseeds are the key to seizing high yields in the early spring. General mu with urea 5 ~ 8 kg or ammonium bicarbonate 10 ~ 15 kg.
The clever application of Brassica napus rape buds is a period of vegetative growth and reproductive growth, and it is also a critical period for the establishment of high-yield shelves. Appropriate timely application of manure fertilizer, the increase rate of up to 17% to 26%. The time of application is before the convulsions or the initial period of convulsions, and the most suitable is the application of 0 to 10 cm in height. Apply fertilizer at the end of February. Manure application is too early, fertilizer effect can not play its due role in the bud stage, and it is easy to defertilize premature aging in the later period; conversely, the height of the main stem and branches are increased, and the late stage is not only easy to fall down, but also the lateness of greediness and susceptibility to sclerotia. disease. Fertilizer requirements accounted for 30% of the total fertilization of rapeseed in a lifetime, and 5-6 kg of pure nitrogen was applied per acre. It is best to apply compound fertilizer. When applying, it is necessary to master the principle of "seeing and determining two things". That is to say, once we have determined the types of fertilizers, the growth period of cabbage cultivars is short, and the productivity of individual plants is low. We should apply them early, while the varieties of Brassica oleracea can be applied late and reapplied. Secondly, the amount of fertilization and the amount of fertilization in the early stages of the seedling growth should be re-applied to the fields with a large amount of fertilizers and weak growth in the early stages. Fertilizer should be applied when there is no water on the leaves of rapeseed, and it is advisable to use the strips to apply fertilizer. Do not apply fertilizer in the morning when the dew is not dry.
The foliar spray of boron on rape is very sensitive to boron and requires a large amount. If wintering canola has severe drought, it will have a great impact on the normal growth and development of rapeseed. Because of continuous drought, the effectiveness of “boron†in the soil will be greatly reduced, and the crop roots will not be able to absorb, which will result in the lack of boron in rape plants. Instead of realizing serious reductions in yields, special attention should be paid to the application of boron fertilizer to the rapeseed. Even if the rapeseed field that has been applied with boron fertilizer has been planted at the time of sowing or transplanting, foliar spraying of boron is still required during the flowering period. Spraying boron on the leaf surface of rapeseed should be rushed to the early flowering stage of buds, with 0.1% of S-boron or 0.1% of borax solution 60 kg, evenly sprayed 2 or 3 times. If the amount of boron fertilizer is not enough or the amount of liquid is not enough, it will not achieve the desired effect of increasing production. In addition, we must pay attention to the quality of purchasing boron fertilizer to prevent the use of counterfeit boron fertilizer and cause no success.
Potassium fertilizer is applied to improve resistance to lodging, disease and resistance to oilseed rape. The application of potash fertilizer has obvious effects. In particular, potassium fertilizers are applied to spring soils with low potassium, such as sandy fields and paddy fields, and can obviously increase yield. The time is 2 From late March to mid-March, about 150 kg of plant ash or 15 kg of potassium chloride can be applied per acre.
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