Boron is usually used borax, base, topdressing, planting can be. For basal fertilizer, 0.5-0.7 kg per acre is generally applied. The general amount of seed dressing is 0.4%-0.6% of the seed amount, the concentration of liquid fertilizer is 5% for soaking, and the soaking time is 20-24 hours. The topdressing should be sprayed 2-3 times in the early flowering stage until full bloom, with the concentration of 0.1%-0.2%.
Zinc fertilizer is commonly used zinc sulfate, 1-2 kilograms per acre applied at the end of the seed dressing dosage of 4-6 grams per kilogram. If the foliar spraying, the concentration of 0.1% -0.5%, the spraying effect is better in the bud period, that is sprayed 25-30 days after emergence.
Manganese fertilizer is commonly used manganese sulfate, manganese fertilizer should be applied early, if the application of manganese fertilizer in the middle and late, it is difficult to correct the lack of manganese, generally 0.5-0.75 kg per acre applied, seed dressing with manganese sulfate per kg 6- 7 grams. Foliar spraying liquid fertilizer has a good effect 7-10 days before budding.
The iron fertilizer is mainly ferrous sulfate, and the application of iron fertilizer is suitable for foliar spraying, and the usual concentration is 0.1%-0.5%.
In order to improve the effect of foliar fertilization, first determine the appropriate spray frequency, spray the general trace elements 2-3 times, interval time 7-8 days. Secondly, choose the best time for spraying fertilizer. It is better to choose cloudy spraying. If sunny spraying is applied, it should be sprayed before 9 o'clock in the morning with no wind, or sprayed after 4 o'clock in the afternoon. Third, add the necessary adhesive and add a small amount of washing powder to the formulated fertilizer as an adhesive. However, be careful not to add alkaline detergent. The addition of acetone, ethanol and other organic substances can also reduce the surface tension of the fertilizer solution, increase the leaf surface contact area, and increase fertilizer efficiency. In addition, it is best not to mix spraying on several trace elements so as to avoid reducing fertilizer efficiency.
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