Trace elements play an irreplaceable role in the growth and development of wheat (such as nitrogen, phosphorus, potassium, etc.). Once a trace element is lacking, it will show the corresponding symptoms of deficiency through the external morphology of the plant. This serves as a basis for diagnosing deficiencies and taking remedial measures.
Iron deficiency: Every ton of dry matter produced by wheat requires 232 grams of iron to be absorbed. In the absence of iron, the leaves are yellow-green, small spots appear, white patches or streaks appear in the young leaves, and the old leaves are premature.
Remedy: If iron deficiency is found, foliar application with 0.2-0.3% ferrous sulfate solution in time.
Boron deficiency: For every ton of dry matter produced in wheat, 18 grams of boron needs to be absorbed. In the absence of boron, the stems and leaves are thick and curved, the leaves are purple, the apical meristems die, forming "top dead", the filaments are stretched and the tillers are abnormal, the wheat ears are not well developed, and the seed setting rate is extremely poor. Not awkward."
Prevention and remedial measures: In the wheat seedling stage, 0.5 kg of borax per acre, 15 kg of fine soil, ditch applied to the line, or 0.1-0.2% in the wheat seedling stage and jointing stage. The borax solution was sprayed once.
Manganese deficiency: For every ton of dry matter produced in wheat, 26 grams of manganese needs to be absorbed. In the absence of manganese, the initial pulse is chlorotic and yellowish, and yellowish white spots appear. Later, it gradually enlarges and becomes a yellow-brown streak. Near the tip of the leaf, there is a clear horizontal line weakened by the tissue, causing the upper end of the blade to bend. Drooping; poor root development, some black death; slow growth of plants, no tillers or few tillers.
Prevention and remedial measures: Foliar application of 0.1-4.2% manganese sulfate solution in wheat seedling stage, jointing stage, flowering stage or when there is manganese deficiency in plants.
Copper deficiency: For every ton of dry matter produced by wheat, 8 grams of copper needs to be absorbed. In the absence of copper, the new leaves are grayish green, the tip of the leaves is whitened, the leaves are twisted, and the white leaves are spotted or streaked in the lower part of the leaf sheath. The old leaves are easily broken or bent at the leaf tongue; the internodes are shortened, the heading is small, and the head cannot be eared or ear Distorted shape, secondary flower abortion on spikelets, imperfect grain development or shrinkage.
Remedy: Found copper deficiency, timely spraying with 0.2-0.4% copper sulfate solution.
Zinc deficiency: For every ton of dry matter produced in wheat, 21 grams of zinc needs to be absorbed. In the absence of zinc, the plants are dwarfed, the leaf margins are twisted or shrunk, and the veins turn from green to yellow until white, and yellow, white and green stripes appear at the edges.
Prevention and remedial measures: In the wheat seedling stage, 1 kg of zinc sulphate per acre, 15-20 kg of fine dry soil or organic fertilizer, the ditch is applied to the line, the earlier the effect is better; or in the wheat seedling stage, get up When the symptoms of zinc deficiency occur in the plant or plant, the surface is sprayed with 0.1-0.2% zinc sulfate solution.
Molybdenum deficiency: For every ton of dry matter formed in wheat, it is necessary to absorb 0.87 grams of phase. In the absence of molybdenum, the plants are short and grow slowly, and the ends of the leaves are first chlorotic. Then, on the whole leaves of the lower part of the heart, small, parallel yellow-white spots appear along the veins, and gradually become linear or flaky. The end is dry, and when it is severe, the whole leaf is dead.
Precautionary and Remedial Measures: Foliar application of 0.01-0.1% ammonium molybdate solution in wheat seedling stage or in the presence of molybdenum deficiency in plants.
Iron deficiency: Every ton of dry matter produced by wheat requires 232 grams of iron to be absorbed. In the absence of iron, the leaves are yellow-green, small spots appear, white patches or streaks appear in the young leaves, and the old leaves are premature.
Remedy: If iron deficiency is found, foliar application with 0.2-0.3% ferrous sulfate solution in time.
Boron deficiency: For every ton of dry matter produced in wheat, 18 grams of boron needs to be absorbed. In the absence of boron, the stems and leaves are thick and curved, the leaves are purple, the apical meristems die, forming "top dead", the filaments are stretched and the tillers are abnormal, the wheat ears are not well developed, and the seed setting rate is extremely poor. Not awkward."
Prevention and remedial measures: In the wheat seedling stage, 0.5 kg of borax per acre, 15 kg of fine soil, ditch applied to the line, or 0.1-0.2% in the wheat seedling stage and jointing stage. The borax solution was sprayed once.
Manganese deficiency: For every ton of dry matter produced in wheat, 26 grams of manganese needs to be absorbed. In the absence of manganese, the initial pulse is chlorotic and yellowish, and yellowish white spots appear. Later, it gradually enlarges and becomes a yellow-brown streak. Near the tip of the leaf, there is a clear horizontal line weakened by the tissue, causing the upper end of the blade to bend. Drooping; poor root development, some black death; slow growth of plants, no tillers or few tillers.
Prevention and remedial measures: Foliar application of 0.1-4.2% manganese sulfate solution in wheat seedling stage, jointing stage, flowering stage or when there is manganese deficiency in plants.
Copper deficiency: For every ton of dry matter produced by wheat, 8 grams of copper needs to be absorbed. In the absence of copper, the new leaves are grayish green, the tip of the leaves is whitened, the leaves are twisted, and the white leaves are spotted or streaked in the lower part of the leaf sheath. The old leaves are easily broken or bent at the leaf tongue; the internodes are shortened, the heading is small, and the head cannot be eared or ear Distorted shape, secondary flower abortion on spikelets, imperfect grain development or shrinkage.
Remedy: Found copper deficiency, timely spraying with 0.2-0.4% copper sulfate solution.
Zinc deficiency: For every ton of dry matter produced in wheat, 21 grams of zinc needs to be absorbed. In the absence of zinc, the plants are dwarfed, the leaf margins are twisted or shrunk, and the veins turn from green to yellow until white, and yellow, white and green stripes appear at the edges.
Prevention and remedial measures: In the wheat seedling stage, 1 kg of zinc sulphate per acre, 15-20 kg of fine dry soil or organic fertilizer, the ditch is applied to the line, the earlier the effect is better; or in the wheat seedling stage, get up When the symptoms of zinc deficiency occur in the plant or plant, the surface is sprayed with 0.1-0.2% zinc sulfate solution.
Molybdenum deficiency: For every ton of dry matter formed in wheat, it is necessary to absorb 0.87 grams of phase. In the absence of molybdenum, the plants are short and grow slowly, and the ends of the leaves are first chlorotic. Then, on the whole leaves of the lower part of the heart, small, parallel yellow-white spots appear along the veins, and gradually become linear or flaky. The end is dry, and when it is severe, the whole leaf is dead.
Precautionary and Remedial Measures: Foliar application of 0.01-0.1% ammonium molybdate solution in wheat seedling stage or in the presence of molybdenum deficiency in plants.
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