How to distinguish between zinc and magnesium deficiency in corn
Corn is a crop that is more sensitive to zinc fertilizer. Timely application of zinc fertilizer is an economical and effective way to increase corn production.
What are the causes of zinc deficiency in corn?
The first is improper fertilization. In recent years, when planting wheat or corn, excessive application of phosphate fertilizer, nitrogen fertilizer, or a large amount of topdressing organic fertilizers that have not been decomposed has induced resistance to phosphorus and zinc in the soil (anti-reaction is the large amount of certain ions in the soil solution). , Can inhibit the occurrence of the phenomenon of crops' absorption of another kind of nutrient segregants.
Secondly, the soil shows varying degrees of saline-alkali damage. In recent years, in order to increase the output, the balance of fertilization has not been paid attention to, the input cost has been blindly increased, and a large amount of inorganic fertilizers have been applied while ignoring the effect of organic fertilizers. This has severely damaged the aggregate structure of the soil and caused serious soil salinization.
Furthermore, the neutralization of pesticides also causes the occurrence of zinc deficiency in the soil. Due to the use of herbicides, fungicides and other pesticides, while saving labor and time to increase yield, the heavy metals in the soil are seriously exceeding the standard, and there are mutual resistance and antagonism between the middle and trace elements, so the soil will have varying degrees of zinc deficiency Phenomenon, such as glyphosate and zinc, iron and other metals in the soil neutralize and lose activity.
Zinc fertilizer can generally be applied as base, topdressing, foliar spray, seed dressing and seed soaking.
1. Kish. When planting corn, use 150 grams of granular zinc or 1-2 kilograms of zinc sulfate per mu, mix 10-15 kilograms of fine dry soil, and apply it to the soil before planting or with machine-seeded chemical fertilizer. Generally, basal zinc fertilizer can be effective for one-season application and two-season application, and the yield can be increased by 15% to 20% per mu.
2. Follow-up. Use 1 to 1.5 kg of zinc sulfate or 150 g of granular zinc, mix 10 to 15 kg of fine dry soil, and apply it in strips or holes from the seedling stage to the jointing stage. Topdressing zinc fertilizer can increase corn yield by 7% to 10.2%.
3. Foliar spraying. The concentration of zinc sulfate foliar spraying is 0.1% to 0.3%. Use 30 grams of zinc sulphate per acre to a bucket of water, spray once in the corn seedling stage and jointing stage respectively, and spray once more on the severely zinc-deficient soil in the bell mouth stage.
4. Seed dressing. Use 4-6 grams of zinc sulfate per kilogram of seeds. First, dissolve zinc sulfate in water. Generally, the fertilizer solution accounts for 7% to 10% of the weight of the seeds, and spray them evenly on the seeds.
Magnesium is one of the constituents of chlorophyll, which is directly related to the performance of corn photosynthesis. Magnesium is an important activator in biochemical reactions. Magnesium can promote the respiration of corn. At the same time, magnesium also plays an important role in the metabolism of nucleic acids and proteins. Magnesium deficiency in maize first shows symptoms from the base of the old leaves, because the magnesium in the old leaves is transferred to the new leaves, and yellow or orange stripes appear in the middle of the veins. After these stripes appear, they form rosary-like white necrotic spots, and finally the leaf cell tissues dry. dead.
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