Trace elements play an important role in the growth and development of wheat, which can not be replaced by a large number of elements (such as nitrogen, phosphorus, potassium, etc.). Once a certain trace element is lacking, it will show the corresponding deficiency symptoms through the external shape of the plant. As a basis for the diagnosis of deficiency and remedial measures.

Iron Deficiency: Wheat needs to absorb 232 grams of iron for each ton of dry matter formed. In the absence of iron, the leaves are yellow-green in color and small spots occur. White patches or stripes appear in the young leaves and the old leaves are withered.

Remedy: If iron deficiency is found, use 0.2-0.3% ferrous sulfate solution for foliar spray.

Boron deficiency: For each ton of dry matter formed in wheat, 18 grams of boron need to be absorbed. In the absence of boron, the stems and leaves were hypertrophic and curved, the leaves were purple, the apical meristems died, and the "top wither" was formed. The filament elongation and the tillers were not normal. The ear development was not good and the seed setting rate was extremely poor. Do not worry."

Prevention and remedial measures: In the wheat seedling stage, 0.5 kg of borax per acre, 15 kg of finely mixed soil, applied in rows, or 0.1-0.2% in wheat seedling stage and jointing stage. The borax solution was sprayed once.

Manganism deficiency: For each ton of dry matter formed in wheat, 26 grams of manganese need to be absorbed. In the absence of manganese, the veins chlorosis between the yellow and white spots at the beginning of the veins, and then they gradually enlarge and form yellow-brown stripe spots. There is a clear, weaker horizontal line near the tip of the leaves, causing bending of the upper ends of the leaves. Drooping; poor root development, some black death; plant growth is slow, with no or very little delivery.

Prevention and remedial measures: When wheat is in the seedling stage, jointing stage, flowering stage, or when plants show symptoms of Mn deficiency, they are sprayed with 0.1-4.2% manganese sulfate solution.

Copper deficiency: For each ton of dry matter formed in wheat, 8 grams of copper need to be absorbed. In the absence of copper, the new leaves are gray-green, with whitened leaves, distorted leaves, and gray spots or stripes on the lower part of the leaf sheath. The old leaves are easily broken or bent at the ligule; the internodes of the leaves are shortened, the earing is short, and the heads or spikes cannot be severe when severe. Distorted, secondary flowers on the spikelets aborted, grain incomplete or shrinking.

Remedial measures: A copper deficiency was found and the leaves were sprayed with 0.2-0.4% copper sulfate solution in time.

Zinc deficiency: For every 1 ton of dry matter formed in wheat, 21 grams of zinc need to be absorbed. In the absence of zinc, the plants were dwarfed and clustered, and the leaf margins were twisted or shrunken. The veins on both sides of the veins changed from green to yellow until white, and yellow, white, and green stripes appeared on the edges.

Prevention and remedial measures: In the wheat seedling stage, 1 kg of zinc sulfate per acre, 15-20 kg of dry soil or organic fertilizer is applied, and the ditch is applied between the rows, the sooner the effect is, the better; or in the wheat seedling stage, During the period or when the plants show symptoms of zinc deficiency, they are sprayed with 0.1-0.2% zinc sulfate solution.

Deficiency of molybdenum: For each ton of dry matter formed in wheat, 0.87 grams of phase must be absorbed. In the absence of molybdenum, the plants are dwarf, grow slowly, and the ends of the leaves turn whitish green first. Then on the full-spread leaves at the lower part of the heart, small, parallel yellow-white spots appear along the veins, and gradually become linear or flaky. Finally the leaves The end is dry and the whole leaf withered when it is severe.

Preventive and remedial measures: When wheat is in the seedling stage or when plants are suffering from symptoms of molybdenum deficiency, spray with 0.01-0.1% ammonium molybdate solution.

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