What are the symptoms of zinc deficiency in corn?

During the growth of corn, there is a high demand for fertilizer, especially for nitrogen, phosphorus and potassium, and a small amount of trace elements are also indispensable. what are the symptoms of zinc deficiency in corn?

What are the symptoms of zinc deficiency in corn?

Due to zinc deficiency in maize seedling stage, the leaves will lose green. When 3-6 leaves are zinc deficient, the veins at the base of the old leaves will lose green and show yellow-white, and gradually spread to the leaf tip. Zinc deficiency after jointing stage will lead to dwarfism, shortening of internodes, bald tip lack of grains and other phenomena. In severe cases, mesophyll tissue will be necrotic, resulting in the death of the whole plant.

Second, what about zinc deficiency in corn?

1. Supplement zinc fertilizer to soil.

The commonly used zinc fertilizers are zinc sulfate, zinc oxide and so on, which can be used as base fertilizer or topdressing fertilizer. The application rate of zinc sulfate is 15.0 ~ 22.5 kg/hm2, which can be mixed with acid nitrogen fertilizer, organic fertilizer, compound fertilizer and so on. If it is used for seed dressing, zinc sulfate can be dissolved in water first. Usually, the concentration of zinc sulfate solution is 0.1%-0.2%, and the solution accounts for 7%-10% of the seed weight. Then it is sprayed evenly on the seed, and the seeds are sown after drying. If foliar spraying, the concentration of zinc sulfate is 0.01%-0.05% in seedling stage and 0.1%-0.2% in later stage. In order to avoid burning seedlings, it should be sprayed in the morning or evening when there is no wind. In the process of application, it should be noted that zinc fertilizer should not be mixed with phosphate fertilizer (calcium superphosphate, monoammonium phosphate, diammonium phosphate, potassium dihydrogen phosphate, etc.). The results show that zinc fertilizer can increase yield to a certain extent when it is used as seed soaking or dressing, base fertilizer or topdressing and foliar spraying. The effect of basic application of zinc fertilizer was the best, the effect of seed soaking was the second, the effect of topdressing was similar to that of spraying, and the effect of seed dressing was the worst.

2. Apply fertilizer scientifically to avoid antagonism

Phosphorus-zinc antagonism is an important factor affecting the availability of zinc, and the interaction between them can be eliminated only by scientific fertilization. Because of the low solubility and poor mobility of phosphate fertilizer, it can be applied centrally by means of hole application and strip application, which can reduce the contact area with soil, not only improve the utilization rate of phosphate fertilizer, but also effectively reduce the antagonistic probability of phosphorus and zinc. It is beneficial to give full play to the fertilizer effect of zinc fertilizer. In addition, the effect of mixed application of phosphorus fertilizer and organic fertilizer is better.

3. Applying farm manure to supplement zinc effectively

Mature farm manure contains a lot of organic zinc, and the effectiveness is good, and the fertilizer effect period is long. The application of farm manure can not only provide zinc for maize growth, but also improve the physical and chemical properties of soil and effectively promote the release of zinc in soil. The production practice showed that when 22.5 ~ 30.0 t/hm2 of mature farm manure was applied to the soil every year, there was almost no symptom of zinc deficiency in corn.