How to use copper and zinc fertilizers for wheat
Copper fertilizer: when copper is lacking, the new leaves are gray-green, the tip is albino, the leaves are twisted, the lower part of the sheath appears gray spots or stripes, the old leaves are easy to break or bend at the tongue; the internodes of the plant are shortened, and the earing is less. Heading or distorted ear shape, abortion of secondary flowers on spikelets, underdeveloped or shrunken grains. Application method: as base fertilizer, use copper sulfate 1 to 1.5 kg per mu, and apply it to the soil during site preparation; as seed fertilizer, when sowing, use copper sulfate to dress seeds at 0.2% to 0.3% of the amount of seeds, mix well and pile up 12 ～17 hours; extra-root topdressing, copper deficiency of wheat is found during the growth period, and 0.2%～0.4% copper sulfate solution should be sprayed on the leaf surface in time.
Zinc fertilizer: When zinc is deficient, the plants are dwarfed and clustered, the leaf margins are twisted or shrunken, the sides of the leaf veins turn from green to yellow until white, with yellow, white, and green stripes appearing on the edges. Application method: as a base fertilizer, use 1 to 2 kilograms of zinc sulfate per mu, and apply it to the soil during site preparation; soak the seeds, put the selected wheat seeds in a 0.05% zinc sulfate solution, soak for 12 to 24 hours, remove them and dry them Sowing; as top dressing, in the wheat seedling stage, use 1 kg of zinc sulfate per mu, add 15-20 kg of fine dry soil or organic fertilizer, and apply it between rows in a furrow. The earlier the effect is, the better; Foliar spray with 0.1%～0.2% zinc sulfate solution after the stage, jointing stage and heading, or when the plants appear zinc deficiency symptoms.
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