1. Boron fertilizer application technology. Boron fertilizer can be used as base fertilizer and foliar fertilizer. Which fertilization method can be applied according to the soil boron content and the growth and development of rapeseed.
1 bottom. The method of bottom application is applicable to soil with moderate or severe boron deficiency. It is suitable to use 0.5kg of borax per acre, and evenly mix with fine soil or organic fertilizer and chemical fertilizer to open the ditch or apply. It is not advisable to deepen or apply boron fertilizer. Even in the case of severe boron-deficient soil, the amount of borax should not exceed 2.0kg/mu, because excessive boron will cause boron poisoning and affect the growth of rapeseed.
2 Foliar sprayed with boron fertilizer. Foliar spray of boron not only saves fertilizer, but also can effectively adjust according to the characteristics of boron required in each growth period of rapeseed. The optimum application period is the late seedling stage (before and after flower bud differentiation) and the twitching period (15~30cm high), which is applied twice, and each application of borax 100-150g per acre (dissolved with a small amount of hot water) sprays 50kg of water. In addition, in order to effectively increase the seed setting rate, increase the number of grains and increase the 1000-grain weight, it is best to use a mixed spray of potassium dihydrogen phosphate per acre, especially for the growth of the milk. The initial flowering period can be based on the boron deficiency symptom as an auxiliary boron spraying method. Each application of borax 50-100g per acre is suitable for spraying 80-100kg of water. Spraying the best after 4 pm on the sunny day before 10:00 am, spray the leaves evenly. Allow the leaves to be fully moist without dripping. If it is rained after spraying, it should be re-sprayed.
2. Precautions. 1 Boron fertilizer is a kind of micro-efficient fertilizer, the difference between the right amount and the excess is very small, and the excess often produces poison. It must be sprayed strictly in accordance with the recommended concentration zone. 2 The combination of base application and foliar application is the best. Boron fertilizer combined with nitrogen, phosphorus and potassium fertilizers will achieve higher yield and maximum economic benefits. Although the foliar spray of boron has a significant yield-increasing effect, in the case of severe boron deficiency or soil, such as the number of spraying, the boron injection often fails to ensure the requirement of boron in rape, so the spraying effect is lower than that of boron. fat.
Huaxian County Shang Hongyan
Rational application of boron fertilizer on rapeseed
Rape is a crop with more boron. Rational application of boron fertilizer is the most effective measure to prevent boron deficiency in rapeseed. At the same time, the application of boron fertilizer can promote the robust growth of rapeseed plants and increase the number of results. Generally, boron fertilizer is applied before the flowering period of rapeseed. The maximum demand for boron nutrition in the growth and development of rapeseed from the flowering period to the pod fruit stage is the two critical periods for spraying boron in the seedling stage and the flood season. Spraying boron fertilizer during flowering and pod development is less effective.
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