"The phenomenon of yellow leaves and dry tips of wheat in the wheat field, some one by one, some in rows, and some sporadic occurrences, what caused it?" In view of the phenomenon of wheat dry tips and yellow leaves, today we will start from eight aspects. Let’s analyze the system and hope it will be helpful to the family.

1. The quality of site preparation

At present, lａnd preparation basically uses machines, mainly plowing, harrowing, and rotary tillage operations. It's very simple to say, but in actual operation, there are three requirements as a whole, emphasizing "deep, fine, and even". In short, the depth of plowing should generally be more than 20cm, the raking should be fine, and there should not be a lot of large rubbish, and the plowing should be even and not leaking or leaking. The quality of the ground preparation is high and meticulous, which is conducive to the rooting of wheat. Seedling emergence, growth; extensive ground preparation is not conducive to better emergence and subsequent growth of wheat, wheat is prone to dry tip yellow leaves.

The country now advocates environmental improvement, prohibits the burning of straw, and advocates returning straw to the field. After the corn is harvested, the corn stalks must be crushed. If the stalks are too large and left in the soil, the soil will be too weak and the wheat roots will appear overhead, which is not conducive to the growth of wheat roots, and affects the absorption of water and fertilizer by the wheat roots, which is not conducive to the growth and development of wheat. , The phenomenon of dry tip yellow leaves is prone to appear in the wheat seedling stage. Therefore, after the wheat is planted, the soil must be suppressed, and the stalks must be crushed. Only in this way can we ensure that the contact area between the wheat seedlings and the lａnd is reduced, and there will be no shortage of water and fertilizer. It is easy to be frozen in winter, which can ensure that our wheat seedlings can grow normally.

2. Herbicide damage

After the wheat has 4 leaves, most of the weeds in the wheat field will grow. At this time, the wheat has a certain resistance to herbicides, and it is the time to use chemical herbicides. Commonly used chemical herbicides are: Trisulfuron + bensulfuron-methyl, tribenuron-methyl + fluroxyacetic acid, fluazuron (ketone)sulfuron, acifluorfen, carfentrazone, metsulfuron, bromoxynil, alkynes Oxalate etc. These herbicides appeared phytotoxicity, mild phytotoxicity wheat leaves chlorosis, the upper half of moderate phytotoxicity wheat withered, and severe phytotoxicity wheat died.

The main reason for the occurrence of herbicide phytotoxicity is that the operation is not considered. For example: the amount of herbicide is used too much, the concentration is too high; the time of use is wrong, the wheat herbicide should avoid low temperature weather, usually from 10 noon to 15 pm When the herbicides are mixed, they are not diluted twice, and the concentration of the liquid medicine is uneven, which is prone to phytotoxicity; the herbicides have been used at home, and the herbicides on the plot next door are windy and flowing, and phytotoxicity occurs; Also, the herbicide purchased is not from a regular manufacturer, and the content and composition are wrong.

If there is phytotoxicity in wheat, if it is severe phytotoxicity, it is recommended to destroy it directly and replant other crops; for mild and moderate phytotoxicity, it is recommended to take the following measures to remedy:

(1) If there is a phytotoxicity, if it is discovered in time on the same day or the next day, you can directly pour clean water to relieve and reduce the phytotoxicity.

(2) It is recommended to spray once with brassinolide + potassium dihydrogen phosphate foliar fertilizer + urea to alleviate the phytotoxicity. If the plot is dry, water the plot, and if the plot is humid, the soil should be loosened to restore normal growth of wheat.

(3) When the growth of wheat seedlings is severely inhibited, gibberellin can be added appropriately.

3. Underground pests

Underground pests mainly include: gold needle insects, grubs, and mole crickets. They gnaw on wheat seeds, the roots of seedlings and stems close to the ground, leading to lack of seedlings and ridges in the wheat field, and the wheat seedling stage will cause the wheat to appear dry tips. Yellowing phenomenon. We must take control measures against underground pests.

(1) Returning corn stalks to the field requires insect eggs to be stored in the soil. Before soil preparation, 2-2.5 kg of 3% phoxim granules can be used to evenly spread phoxim on the ground before plowing, and then turn the ground.

(2) Wheat seed dressing is now a routine operation, and it is basically being done. Seed dressing agents can choose chlorpyrifos, phoxim, fipronil and other seed dressing.

(3) After the emergence of wheat seedlings, the control of underground pests is mainly by spreading poisonous soil or spreading poisonous bait: 3% phoxim granules 3-4 kg to 30-40 kg fine soil, mix well and apply in furrow; Use 5 kg of wheat bran, stir fragrant, add appropriate amount of water and 40% methyl isothion, mix well, and sprinkle in the field in the evening, 12.5-19kg per acre.

Zhengzhou Delong Chemical Co., Ltd. is a plant growth regulator production base in China, established in 2009, specializing in the production of plant protection products. If you have any questions, please feel free to contact us any time.