Application Technology of Trace element Fertilizer on Wheat

Trace elements play an irreplaceable role in the growth and development of wheat (such as nitrogen, phosphorus, potassium, etc.). Scientific application of trace element fertilizer is an important measure to ensure high and stable yield of wheat.

Iron fertilizer wheat needs to absorb 232 grams of iron for every 1 ton of dry matter. In case of iron deficiency, the leaves are yellow and green with small spots, the young leaves appear white patches or stripes, and the old leaves wither early. Application method: spray the leaf surface with 0.2%-0.3% ferrous sulfate solution in the early growth stage of wheat or when the plant is found to be iron deficient.

Boron fertilizer wheat needs to absorb 18 grams of boron for every 1 ton of dry matter formed. In the case of boron deficiency, the stem and leaves are thick and curved, the leaves are purple, the apical meristem dies, forming "top withered", the filament extension and tillering are abnormal, the development of wheat ear is poor, the seed setting rate is very poor, and in the later stage, "ear is not sterile". The application of boron fertilizer to boron-deficient soil can increase wheat yield by more than 10%. The method of application is as follows: (1) as base fertilizer. One kilogram of borax per mu was applied to the soil before sowing. (2) planting fertilizer. Use 10 grams of borax, dissolve in 5 kilograms of water, mix 50 kilograms of wheat seeds, or soak the selected wheat seeds in 0.01% 0.05% borax solution for 6 hours. (3) extra-root topdressing. In wheat seedling stage, jointing stage and booting stage, 0.1%-0.2% borax solution was sprayed once respectively.

Manganese fertilizer wheat needs to absorb 26 grams of manganese for every 1 ton of dry matter. In the case of manganese deficiency, chlorosis and yellowish-white spots appeared at the initial stage, and then gradually expanded and connected into yellow-brown stripes, with a clear tissue weakening horizontal line near the tip of the leaves, resulting in the bending and drooping of the upper end of the leaves; the root system developed poorly, some blackened and died, and the plants grew slowly, without tillers or few tillers. The method of application is as follows: (1) as base fertilizer. Use 1 kg of manganese sulfate per mu, combined with soil preparation into the soil. (2) planting fertilizer. When sowing, mix 4-6 grams of manganese sulfate per kilogram of wheat seed. (3) extra-root topdressing. In the wheat seedling stage, jointing stage, flowering stage or the symptom of manganese deficiency in the plant, foliar spraying with 0.1%-0.2% manganese sulfate solution.

Copper fertilizer wheat needs to absorb 8 grams of copper for every 1 ton of dry matter formed. In the case of copper deficiency, the new leaves are grayish green, the leaf tips are albino, the leaves are twisted, gray-white spots or stripes appear in the lower part of the leaf sheath, and the old leaves are easy to break or bend at the ligule; the plant internodes are shortened, the heading is few, and the spike shape is not distorted seriously. Grain underdevelopment or wrinkle. The method of application is as follows: (1) as base fertilizer. Copper sulfate is used for 1-1.5 kg per mu and applied to the soil during soil preparation. (2) planting fertilizer. When sowing, mix the seeds with copper sulfate at 0.2%-0.3% of the seed amount, mix well and pile up for 12-17 hours. (3) extra-root topdressing. When it is found that wheat is deficient in copper during the growing period, spray the leaf surface with 0.2%-0.4% copper sulfate solution in time.

Zinc fertilizer wheat needs to absorb 21 grams of zinc for every 1 ton of dry matter. In the case of zinc deficiency, the plant is dwarfed and clustered, the leaf margin is twisted or wrinkled, both sides of the leaf vein change from green to yellow to white, and yellow, white and green stripes appear on the edge. According to local comparative experiments, the application of zinc fertilizer in zinc-deficient areas can increase the yield of wheat by 10% to 18%. The method of application is as follows: (1) as base fertilizer. Zinc sulfate is used for 1-2 kg per mu and applied to the soil during soil preparation. (2) soaking seeds. Put the selected wheat seeds in 0.05% zinc sulfate solution, soak for 12 hours for 24 hours, fish out and dry and sow. (3) as topdressing. In wheat seedling stage, zinc sulfate 1 kg per mu, mixed with fine dry soil or organic fertilizer 15-20 kg, ditching between rows, the earlier the better. (4) extra-root topdressing. The leaves were sprayed with 0.1%-0.2% zinc sulfate solution at the seedling stage, jointing stage and after heading, or when the plant showed symptoms of zinc deficiency.

Molybdenum fertilizer wheat needs to absorb 0.87 grams of molybdenum for every 1 ton of dry matter. In the case of molybdenum deficiency, the plant is short and grows slowly, and the end of the leaf fades at first, then on the whole spreading leaf of the lower part of the heart leaf, small, parallel yellow-white spots appear along the leaf vein, and gradually connect into a linear or flaky shape, and finally the leaf tip dries up, and in severe cases, the whole leaf dies. Application method: (1) seed dressing. Use 2g ammonium molybdate per kilogram of wheat seed; first dissolve ammonium molybdate in 40 ℃ warm water, then mix the seeds. (2) soaking seeds. Soak the wheat seeds in 0.05% 0.1% ammonium molybdate solution for 12 hours, then dry and sow the seeds. (3) extra-root topdressing. In wheat seedling stage, jointing stage, booting stage or plant symptoms of molybdenum deficiency, 0.01%-0.1% ammonium molybdate solution was sprayed on the leaf surface.