First, the factors that cause wheat lack of seedlings or uneven emergence

1. Seed quality. After the seeds are harvested, they are not noticed by drying or drying, which causes some seeds to undergo mildew; the seeds are mechanically damaged during processing, and some seeds, seedlings, seeds of uneven size and other factors will affect the emergence of seedlings.

2. Land preparation quality. Shallow ploughing, uneven land preparation, unevenness, large and large clods, and unreliable subsoil will affect the emergence of wheat, resulting in lack of seedlings or seedlings.

3. Return the straw quality. Straw returning can realize the recycling of fertilizer, which is conducive to soil improvement. However, if the quality of straw smashing is poor, it will affect the quality of the soil preparation and sowing, and will produce dew seeds, deep seeds and hanging seedlings. In case of drought or low temperature, it will lead to The seedling rate is reduced.

4. Soil moisture. Soil moisture is not suitable, too dry or too wet, will affect the emergence of wheat.

5. Seeding depth. The seeding is too deep, the stem in the ground is too deep, the seedling is late, and the seedling is weak. If the soil is dry, the soil bottom and the surface can not be connected, which will affect the wheat emergence rate. The sowing is too shallow, the soil is lost, and it is easy to cause the seeds to fall and affect the emergence of seedlings.

6. Pests are harmful. Uncoated or untreated seeds are vulnerable to underground pests such as tigers and golden worms, resulting in lack of seedlings or seedlings.

Second, preventive measures

1. Choose good seeds. When purchasing seeds, you should choose high-quality seeds with full grain, uniform size and shape, bright color, no impurities, no mildew, no mechanical damage. After sowing seeds, the seedlings are quick to emerge and the emergence rate is high, and the seedlings and seedlings are strong, which is conducive to high yield.

2. Improve the quality of land preparation. Before planting, we must do a good job in deep cultivation and repression. Deep ploughing should ensure the quality, the concentration is appropriate, the depth is consistent, and there is no ploughing and ploughing. After ploughing, cover and suppress in time, so that the ground is level, the topsoil is evenly divided, and the bottom soil is solid.

3. Improve the quality of straw returning. For straw returning to the field, the straw should be thoroughly crushed, and the grass should be ploughed and ground, then soiled, then planted and suppressed. When rotary tillage, it is necessary to increase the depth of rotary tillage to ensure the quality of rotary tillage.

4. Pour the bottom of the water. The suitable soil moisture for wheat sowing is 75%-80% of the field water holding capacity. When the sowing is suitable, it can ensure the whole seedling of wheat. Before the wheat is planted, it is necessary to water the plants in advance, and the fields without irrigation conditions should be robbed and sown, and the fast-receiving and quick-cultivation should not be used to dry, and the existing lyrics in the soil should be used as much as possible. Sowing seedlings.

5. The sowing depth should be appropriate. The sowing depth is preferably 3-5 cm. In this depth, it is necessary to grasp the principle that the early sowing should be deep and the late sowing should be shallow; the sandy land should be deep and the clay should be shallow; the principle of deep sorrow should be deep and the feeling of goodness should be shallow.

6. Pest control. When sowing, use the coated seeds or seed dressing to prevent the ground pests from biting the seeds after sowing. When there are underground pests in the wheat seedling stage, it is necessary to timely scatter the poisonous soil for prevention and control.

7. Appropriate increase in seeding rate. The amount of wheat planted is generally about 10 kg per mu. In the case of soil mass, large clods, or poor quality of straw returning, the seedlings are weak, and the seedling rate is low, so the seeding rate should be increased appropriately. About kilograms.

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