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Today is the winter festival, which also means that the weather will become colder and colder in the future, and it will enter the real winter. In recent days, there have been continuous low temperature, rainy weather in some areas, and less light time, resulting in yellow leaves and rotten roots in many wheat varieties. What causes this? What measures should be taken? Let's analyze the reasons for everyone. The main points are as follows:
<h1>The tillage layer is shallow</h1>
This year, the straw is returned to the field, there are many plots, the amount of corn straw returned to the field is large, the tillage layer is generally less than 20 centimeters, wheat is difficult to take root in the soil, the supply of nutrients is insufficient, and the phenomenon of yellowing will occur over a long period of time.
In addition, the use of rotary tillage sowing, the tillage layer is only about 15cm, after the rotary tillage is not suppressed, resulting in the real and the low void, wheat is easy to appear "hanging" phenomenon.
Solution: When planting in the future, after the straw is chopped, it must be suppressed to prevent hollowness. For wheat that has emerged, nitrogen fertilizer should be supplemented in time, and it is best to supplement nitrogen fertilizer before.
<h1>Sow too deeply</h1>
Under normal circumstances, the suitable depth of wheat sowing is 3-5 cm, if it exceeds 5 cm, then the seedling growth is weak, yellow, tillering rate is less.
The agricultural proverb says: One inch shallow, two inches deep, three inches will be stuffy. It is said that the sowing depth of wheat, under normal circumstances, if it exceeds 5 cm, then even if it can produce seedlings, it is also a seedling, if it is a dry day, it can produce seedlings, but the seedlings are weak, yellow, and the tillering rate is small. This year's wheat seedlings should be related to this.
Solution: For fields with mild disease, grab a hurry to the agricultural technology department to buy medicine and spray. It is necessary to take root and strengthen the seedlings, but also to kill the bacteria. The best combination of the two is to topdress in time.
<h1>Pest</h1>
Insect infestation: Yellowing of leaves caused by wheat aphids and wheat spiders sucking up leaf sap, mainly around the wintering period.
Diseases: Wheat diseases mainly include leaf blight, striated blight, total erosion disease and root rot. They are all fungal diseases that can show yellow leaves in the early stages.
The phenomenon of yellowing and dead trees of wheat has a great impact on wheat yield, and if it cannot be treated in time, it will affect the normal growth and safe overwintering of wheat, resulting in a serious reduction in yield. Therefore, it is very important to do a good job of prevention! For plots that have already occurred, timely symptomatic administration.
<h1>Specific control methods for leaf blight</h1>
Medication formula 1 (best): xanthophyllum (cure) + benzene C (strong seedling treatment) + rooting agent (rooting) + brassica (antifreeze damage) + potassium dihydrogen phosphate (strong seedling);
Medication formula 2 (save money): enkenazol (cure disease strong seedlings) + dofu (treatment) + brassica (antifreeze damage) + potassium dihydrogen phosphate (strong seedlings);
Formula 3 (inexpensive): triazolone (cure) + brassinolin (antifreeze) + potassium dihydrogen phosphate (strong seedlings).
Wheat blight; It harms the root system and stems, hinders the transport of nutrients and water, and causes wheat leaves to turn yellow. 50 kg of water can be controlled by stem base spray per mu with 12.5% hegolin 20 g or 20% jinggangmycin 50 g.
<h1>Persistent low temperature frost damage</h1>
Frost-damaged leaves are generally twisted and yellow at the tip or middle of the leaflet. The main factors of frost damage in wheat:
(1) Varieties of wheat: Freeze-resistant varieties should be selected
(2) Sowing period: from cold dew to frost to the best sowing period
(3) Sowing amount: The sowing amount is determined according to the soil moisture and temperature
(4) Climatic factors
(5) Seedling conditions, moisture conditions, and the quality of land preparation and sowing will all affect the occurrence of wheat frost damage.
<h1>Remedial measures after frost damage in wheat fields</h1>
1. Timely application of nitrogen fertilizer to promote the rapid growth of tillers. The main stem and the large tiller have frozen to death in the wheat field, and the joint fertilizer is applied in combination with watering to the wheat rejuvenation and jointing stage, and the urea is applied 10-15 kg/mu.
2. Generally frozen wheat fields, only the leaves are frozen, there is no dead tiller phenomenon, early spring should be remedied and applied as soon as possible (spraying potassium dihydrogen phosphate + brassicalide) to promote the rejuvenation of wheat seedlings; in the starting stage of fertilizer watering, improve the tillering rate.
3. Strengthen fertilizer and water management in the middle and late stages to prevent premature aging.