At the time of sowing, 0.5-1kg zinc sulfate was applied per mu or 0.2-0.3% zinc sulfate solution was sprayed on the leaves at the seedling stage and the early flowering stage.
The effective boron content in soil was less than 0.5 mg/l, and the boron application effect was significant.0.1% boric acid or borax can be used for external spraying.
Molybdenum fertilizer can be mixed as seed fertilizer or deep application outside the root.1. Seed dressing: 1 ~ 2 grams of ammonium molybdate per kilogram of seeds are put into a porcelain basin and dissolved with water. The amount of water can be used to wet the seeds without remaining fertilizer.2. External fertilization: apply 0.05% ~ 0.1% ammonium molybdate, 50 kg solution per mu, and spray the fertilizer from seedling stage to before flowering.3. Seed fertilizer: 10 grams of ammonium molybdate per mu, dissolved in water, mixed with potassium phosphate or farm manure, and applied in furrow or hole.
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