How to identify the deficiency of corn?

Reporter: At present, it is the corn growing season. In order to strive for high yields, we must pay attention to the deficiency of corn. So what is the deficiency of corn?

Expert: The deficiency syndrome is a special symptom that is manifested externally due to malnutrition in the body during crop growth. This is called a physiological disease. It is different from pathogenic diseases and should not be confused.

Reporter: Would you specifically talk about the performance of corn deficiency syndrome?

Experts: Let me first talk about the symptoms of corn lacking a lot of nutrients.

In the absence of nitrogen, the plants were dwarfed when they were short of nitrogen, and they grew slowly. From the bottom to the top, the leaves of the plant grew to dry from the midrib to the base.

Phosphorus deficient, corn phosphorus deficiency in the seedling tip and leaf margin was purple, the old leaves turn yellow, small stalks, slow growth, heading emergence of early spikes, bending deformity, uneven grain, not full.

In the absence of potassium, when the corn lacks potassium, the edges of the old leaves are scorched and brown until they die. The young leaves turn yellow and the plants are short and weak, and they are easy to fall.

Reporter: Then what will be the performance of corn lacking trace elements?

Experts: Zinc deficiency, the symptoms of zinc deficiency in corn are white seedlings, mosaics, and white mosaic disease. Generally from the four leaf stage, the color of the base of the new leaf becomes pale and yellow-white. At the five-to-six leaf stage, yellowish and light green stripes appear between the 1st and 3rd leaves of the leaf, veins are still green, and purple stripes appear at the base. After 10 to 15 days, the purple stripe gradually turned yellow-white, and the leaves became thin, like white seedlings. When it is serious, it is far behind me. Zinc-deficient corn plants are dwarfed, internodes shorten, leaf pillows overlap, and the top seems flat. Severe white leaves gradually dry, and even the whole plant died. After the jointing, the leaf color gradually turned greenish. During the bell-mouthing period, yellow-green stripes appeared on the lower middle leaves, which was called the mosaic. The base leaves turn white again, translucent. After tasseling, it has a mosaic shape from bottom to top. Plant development was hindered, tasselling and silking were both 2 to 3 days later than normal plants, with more empty stalks and a lack of grain and bald tip.

With iron deficiency, the leaf veins of newborns are chlorotic and green, and the veins remain green with a pronounced stripe shape. The stems and leaf sheaths are purple-red.

Boron deficiency, the young leaves do not bloom and white, gradually withered to death, old leaves and white veins between the veins, plants dwarf, thin.

In the absence of manganese, the symptoms often start from the new leaves, the young leaves turn yellow, there are green spots between the veins, the leaves are soft and the roots are slender and white.

Reporter: What measures should be taken when farmers find out the deficiency of corn?

Experts: When it is found that corn has some deficiency symptoms, it is necessary to timely spray foliar fertilizer containing the nutrient, spray twice every 5 to 6 days, generally can quickly bear fruit, the symptoms of deficiency gradually disappear The output loss is not great. In short, the use of organic fertilizers and NPK fertilizers combined with timely application of balanced fertilization of micro-fertilizer can fundamentally solve the problem of nutrient deficiency.

Expert Tips:

1. The deficiency of the disease is an external manifestation of malnutrition within the crop.

2. Find out the symptoms of nutrient deficiency and timely apply fertilizers containing this nutrient.