[China Agricultural Machinery Industry News Network With the development of maize cultivation, corn growing period, often appear in such a situation, purple corn plants appear in the 3 to 4 leaf stage, when some of the corn leaves still 7-8 Does not fade, this phenomenon is called corn red seedlings. The problem of "red seedlings" in a short period of time is not big. If the "red seedlings" are too long, the production will be seriously reduced. Red seedlings can cause short plants, low chlorophyll content, and decreased root activity. 
How to solve the "corn red seedling"?
In recent years, with the development of China's agricultural economy, the planting area of ​​corn, one of the three main staple foods in China, is also constantly increasing. In the period of corn growth, such a situation often occurs. The purple-red plants appeared in the four-leaf stage, and some did not fade when they reached the 7-8 leaves of corn. This phenomenon is called corn red seedling.
The problem of "red seedlings" in a short period of time is not big. If the "red seedlings" are too long, the production will be seriously reduced. Red seedlings can cause short plants, low chlorophyll content, and decreased root activity.
Etiology analysis:
In recent years, with the large-scale promotion of compact corn varieties, dense planting, high temperature, weed coexistence, and continuous cropping for many years have resulted in various soil-borne diseases and defects in corn. In addition to red leaf seedlings, common diseases in maize seedlings include yellow leaf seedlings, albino seedlings, dead leaf seedlings, purple leaf seedlings, yellow-green seedlings, corn dwarf mosaic seedlings, maize rough-reducing disease seedlings, and total-etching disease seedlings. Sheath blight and so on. The corn plant is a purple-red corn plant called "red seedling".
This phenomenon occurs mostly from the 3rd leaf stage to the 4th leaf stage of corn, and some of them still do not fade when they are 7 to 8 leaves. Some are only red or purple parts of the blade. In severe cases, the entire sheath and stem are purple-red.
There are many reasons for the occurrence of "red seedlings", mainly due to the following reasons.
1
Plants are deficient in phosphorus.
Phosphorus deficiency in the soil can not meet the growth needs of maize seedlings, root growth and development are hindered, and seedling growth is slow. As the phosphorus content in the seedlings gradually decreases, the leaves turn from dark green to red or purple.
2
Water in the field .
Poor drainage in the field, high soil moisture, affecting the respiratory and metabolic effects of the root system, the growth of roots is blocked, resulting in malnutrition and redness and purple.
3
Underground pest damage.
The roots of the seedlings are bitten by underground pests, and the ability to absorb water and absorb fertilizer becomes weak, which causes the seedlings to weaken and form red seedlings.
4
Low temperatures can also cause corn seedlings to turn red.
In the northeastern region, corn is planted earlier, and in the early spring, cold damage caused by "cold spring" will cause the whole plant of the corn seedlings to become red. In this case, as the temperature increases, the red seedling phenomenon will gradually ease and disappear later.
5
Phytotoxicity and pests can also cause corn seedlings to become red .
The phytotoxicity, insect pests, etc. caused the sugar metabolism in the corn seedlings to be blocked, and a large amount of anthocyanins were produced, forming a purple-red seedling. If a large area occurs, it is necessary to consult with the experts of the local agricultural department in a timely manner. After the cause is identified, the remedy can be carried out in a targeted manner.
6
other reasons.
The soil is too sticky, the sowing is too deep or shallow, and improper fertilization causes "burning seedlings". If the pesticide is improperly introduced, seedling poisoning will lead to "red seedlings".
Prevention:
1. For early application of phosphate fertilizer, it is mainly based on quick-acting phosphate fertilizer, which can apply 10~15 kg of calcium phosphate per acre, and can also be combined with insect-repellent spray 1% superphosphate leaching solution;
2. Leveling the land, excavating the drainage ditch, so that the rain stops and the water is dry, and there is no water in the field.
3. Do a good job in the prevention and control of underground pests, so as to soak seeds or seed dressing, and use coated seeds.
4. For shallow or early seedlings, watering should be timely, cultivating loose soil to protect the seedlings.
5. If red seedlings have appeared in the field, the following measures can be taken:
(1) Spraying 300 times of potassium dihydrogen phosphate on the foliar surface 2 to 3 times, spraying once every 3 days; or spraying 1% superphosphate solution (clear solution). Special reminder is that the products that must be used for potassium dihydrogen phosphate, there are many very cheap "potassium dihydrogen phosphate" on the market, in fact, "magnesium sulfate", farmers must be careful to buy when purchasing.
(2) Loose soil to increase ground temperature.
In addition, low temperature can also cause corn seedlings to become red. In the northeast region, corn planting is earlier. In the early spring, cold damage caused by "cold spring" will cause redness of the whole plant of corn seedlings. In this case, with the increase of temperature, the phenomenon of red seedling will gradually ease and disappear later.
Phytotoxicity and pests can also cause corn seedlings to become red. The phytotoxicity, insect pests, etc. cause the sugar metabolism in the corn seedlings to be blocked, and a large number of anthocyanins are formed to form a purple-red seedling. If a large area occurs, the experts of the local agricultural department should be consulted in time to find out the cause and remedial can be targeted.
(Original title: 30% corn will appear red seedlings, do you know how to prevent it?)
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