1. Early application of Spring Fertilizer: In the early spring, topdressing can remedy the inadequacy of winter rapeseed growth and promote more branches and 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. Generally 5-7 kg of urea or 10-15 kg of ammonium bicarbonate.
2, clever application of fertilizer: Rape buds fertilization period should be treated according to rape growth and appearance. For those fields with weak seedlings and poor growing conditions, it is necessary to reapply early, that is, when the height of axillary is about 50 centimeters, mu Shi excrete 15-20 urine, add 5 kg of urea or 45% compound fertilizer 10-15 kg; Growing fields with strong green leaves and dark green leaves must be delayed or less applied.
3, spraying boron on the leaf: rape is very sensitive to boron, and it needs a large amount. In winter and spring, most of China’s winter rapeseeds suffered severe and continuous drought, which had a major impact on the normal growth and development of rapeseed. Because of the continuous drought, the effectiveness of "boron" in soil is greatly reduced, and crop roots cannot be absorbed. As a result, rapeseed plants are deficient in boron, and flowering is not real, resulting in severe reduction in yield. Therefore, special attention should be paid to the application of boron fertilizer to drought-bearing rape. Even if rapeseed fields with boron fertilizers have been applied at the time of sowing or transplanting, foliar spraying of boron is still required during flowering.
The spraying of boron on the leaves of rapeseed should be robbed from this year to the beginning of the flowering period. Mu with 0.1% Sonic Boron or 0.5% borax aqueous solution 60 kg, even spraying 2-3 times (1 increase over the year). 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 application: In order to improve rape resistance, disease resistance, and resistance to waterlogging, the application of potash fertilizer has obvious effects. In particular, potassium fertilizer is applied to spring soils with low potassium, such as sandy fields and paddy fields, and can obviously increase yield. From late February to mid-March, we can use plant ash to spread approx. 150 kilograms or potassium chloride 15 kilograms.
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