For dry land and ground-irrigated plots, zinc fertilizer should be applied as a base fertilizer, or soaked (rooted) and seeded. For drip irrigation and sprinkler irrigation, zinc fertilizer should be applied with water and fertilizer integration technology. If symptoms of zinc deficiency occur during crop growth, foliar application can be used as a remedy.

Water and fertilizer integration, dissolving zinc sulfate monohydrate in irrigation water, and applying it to the root of the crop with water through a pipe fertilization system such as drip irrigation or sprinkler irrigation. Fertilization time should be applied from the seedling stage to the jointing stage, and the continuous application should be carried out twice, each time 0.5 kg per mu, and can be applied together with other water-soluble fertilizers in the irrigation water. If the irrigation water is alkaline, the pH should be adjusted to 5 to 5.5 before adding zinc sulfate monohydrate to the fertilizer. The acid adjustment method is to monitor the pH value of the fertilizer solution with a pH meter, and gradually add sulfuric acid to a suitable range.

For soil application, use 2 kg of zinc sulphate monohydrate and 10 to 15 kg of fine soil per acre for strip application or acupoint application. It can also be mixed with other compound fertilizers for application or acupoint application.

Foliar application, sprayed with a mixture of 0.1% to 0.5% zinc sulfate monohydrate and 1% urea in the continuous leaf surface from the seedling stage to the jointing stage, at intervals of 7 days. Zinc sulfate monohydrate can be sprayed together with other water-soluble foliar fertilizers, drought-resistant anti-retroil preparations, pesticides, and the like.

Soak seeds, soak seeds with 0.02% ~ 0.05% zinc sulphate solution for 6 ~ 8 hours, pay attention to the concentration of more than 0.1% will have an impact on corn germination.

Seed dressing, according to 4 to 6 grams of zinc sulfate per kg of seeds, first dissolve in a sprayer or watering can, then add the right amount of water, while stirring, stir the seeds, dry and then seed.

It should be noted that in the above method, the zinc fertilizer should be avoided to be applied together with the phosphate fertilizer, because the mixture of the two is easy to produce the water-insoluble zinc phosphate, and the effectiveness of the zinc fertilizer and the phosphate fertilizer is reduced. Especially when using water and fertilizer integration and foliar spraying, it is necessary to strictly avoid the simultaneous application of zinc fertilizer and phosphate fertilizer to avoid clogging the pipeline.

Traditionally used zinc fertilizer varieties are mainly zinc sulfate and zinc sulfate heptahydrate, in addition to chelated zinc, zinc oxide, zinc carbonate, zinc nitrate and the like. The zinc-containing fertilizers developed in recent years, such as zinc humic acid, zinc-containing urea, zinc-containing compound fertilizers, and zinc-containing water-soluble fertilizers, have good effects, and are labor-saving and labor-saving, and are gradually welcomed by farmers.

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