Maize seedlings dead seedlings preventive measures

The phenomenon of lack of seedlings and seedlings of maize occurred from time to time, which greatly affected the corn yield. Find out the reasons for the lack of seedlings and dead seedlings, and timely comprehensive prevention and control, so as to achieve high yield and high efficiency of corn. The following is a brief analysis of the causes and comprehensive prevention and control of maize seedling dead seedlings:

Soil moisture is too high or too low can easily lead to lack of seedlings broken ridge. When the soil moisture is sown at the time of sowing or the rain after sowing causes excessive soil moisture, on the one hand, the seed's respiratory metabolism is slow, affecting emergence. On the other hand, it caused the seed to absorb and damage, and the ability to germinate into seedlings decreased, the seed became moldy and rot, and the lack of seedlings and ridges formed. The soil moisture is too low to meet the germination requirements of the seed germination, resulting in poor field emergence.

Insufficient oxygen in the soil. When sowing is too deep, soil moisture is too large or hardened, soil permeability is poor, and oxygen is insufficient, affecting seed germination, resulting in seedling deficiency. Generally sandy soil lacks seedlings, and clay lacks seedling weight. Poor quality. At the time of sowing, the shades were different, and the cover soil was lax. Some seeds sowed on the surface formed a float, which was not conducive to emergence. The popularization and application of small seed drills, improper operation during operation, or improper adjustment of the appropriate seeding amount according to the size of the seeds, and the uneven walking speed, too fast, will all result in the lack of seedlings and ridges.

Pests cause dead seedlings. The main pests that injure corn are ground tigers, cockroaches, cockroaches, and golden needles. In recent years, maize seedlings, corn borer, and corn borer have caused damage to seedlings. Insufficient; corn seedling disease is the main disease of corn seedling blight, symptoms: corn in the 2 to 3 leaf stage began to disease, diseased seedlings yellow, edge scorch, leaves from the bottom up gradually dry, pull out the seedlings observed, roots Dysplasia, reduced root hair, and brown roots. Mild disease patients form weak seedlings, and seriously ill people gradually die. Inappropriate use of pesticides such as herbicides or improper fertilization is also one of the main causes of poor seedling quality or lack of seedlings.

Preventive measures: 1. Use high quality seeds. The seed purity should not be less than 96%, the germination rate should be no less than 85%, no mildew, no insect damage. After the seeds are coated, they must be air-dried and must be sown. At the same time, attention should be paid to the fact that seeds with a seed germination rate of 95% are not suitable for single seeding. Otherwise, once the germination conditions are unsuitable, it will inevitably cause varying degrees of seedling deficiency. 2. Intensive farming, improve the quality of sowing. Strict sowing quality when sowing, so that the selected seeds, the next seed uniform, tight soil, suitable depth, on-demand hole rate does not exceed 2%. 3. Check the seedlings in time. After the emergence of seedlings, seedlings should be checked in time. In order to make up for the same period of strong seedlings, one line can be reserved for seedlings at the time of sowing. When transplanting, pay attention to transplanting with pods to reduce root damage and clear the remaining seedlings after filling. 4. Rational use of fertilizers and pesticides to prevent fertilizer burning or phytotoxicity. Promote the use of corn seed coating technology, can prevent seedling blight, stalk rot, dwarfism, etc., but also can cure underground pests, promote seedlings, Miao Qi, Miao Zhuang. Farmers Daily

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