Analysis of common problems in garlic seedling stage

Emergence

The emergence of garlic is not uniform, mainly due to the treatment and sowing of garlic seeds. For example, if the seeds were left in the plant, they were not selected with large petals and high-quality garlic; the inferior garlic was not removed before sowing; Therefore, doing a good job of seed retention and treatment before sowing is conducive to emergence and tidyness. The specific operations are:

● Scientific retention seeds are more than 5cm in garlic diameter, and garlic seeds are selected for planting. After being chopped, they are sun-dried in the sun for 2 to 4 days, so that the leaf sheaths and scales are fully dried and dehydrated, and the garlic head is quickly allowed to enter dormancy.

● The purpose of stacking air is to let garlic slowly release moisture and prevent water from becoming moldy. During the storage period, attention should be paid to ventilation. Pay attention to checking the temperature. Under normal circumstances, it is necessary to control the temperature in 5 to 6 days before sowing to prepare for the autumn sowing.

● Before drying, plant the garlic and soak it in the sun for 2~3 days.

● Removing garlic skin The garlic's ability to absorb water and hinder the growth of new roots removes the garlic peel during the seed dressing, which can promote garlic sprouting and hair rooting to a large extent.

● The grades of garlic need to be rid of wound flaps, wormhole flaps, yellow disease flaps, paste bud flaps, and tiny flaps. The garlic clove that meets the requirements shall be stored separately according to the specifications of large, medium and small grades and cultivated in different grades.

● Liquid Soaking: Soak the garlic in the carbendazim 500-fold solution for 12-16 hours, remove and dry it and sow.

● Cold treatment: Soak the garlic in the water for 4 hours and put it in a bag. Put it in a cool cellar. After two weeks, when the root of the garlic is “open mouth”, sow immediately. Places with conditions can be placed in a cold store at 0°C to 4°C for 10 to 15 days.

Slow emergence

There are many reasons for the slow and poor emergence of garlic: If the cover soil is too thick, soil surface compaction, herbicide residues, etc. will affect the emergence of garlic. In addition to doing garlic processing, there are the following aspects that need attention:

● Garlic cover soil should be 2 to 4 cm. If the thickness exceeds 5 cm, it will have an adverse effect on the emergence of garlic. Generally speaking, if soils with poor sand content and soil organic matter content are covered with soils, the soil may be thicker, and the soil is more viscous and soil organic matter content is lower.

● For the film-covered seedlings, if the quality of the cover film is good, about 80% of the seedlings can self-eject the mulch, and if the mulch cannot be pushed out, the bamboo shoots should be timely broken with a bamboo knife to prevent burning.

● Continual rain weather on the surface of the soil can cause surface compaction of the soil. The consolidation should be promptly removed when the topsoil becomes slightly dry after the rain, creating loose soil conditions for garlic emergence. Watering after sowing takes the form of flood irrigation, and it is also easy to form soil compaction. Therefore, garlic can only be furrowed after watering so that water can naturally penetrate into the soil in the middle of garlic sprouts.

● Herbicide residue garlic is very sensitive to herbicides. When the herbicide with longer residual effect is used in the former, it will have an adverse effect on garlic seeds and emergence. Pay attention to the alternate use of various herbicides and strictly control the dosage.

Yellow garlic

Garlic yellowing, in addition to nutritional reasons, it may also be related to weight loss, fertilizer damage, phytotoxicity, pests and diseases.

● Nutrient deficiency and fertilizer damage The nitrogen deficiency, potassium, calcium, magnesium and other elements in the seedling stage will appear yellow leaf phenomenon, and the fertilizer damage will also lead to yellow leaf phenomenon. For example, excessive nitrogen fertilizer will produce large amounts of ammonia under high temperature conditions, leading to species Flap and garlic poisoning died. Therefore, we must pay attention to reasonable fertilization, pay attention to the application of organic fertilizer and biological bacterial fertilizer.

● In addition to cultivating plants, garlic sprouts will not only cause yellow tips, but also produce other diseases, and they will not grow well, affecting the yield and quality. Pay attention to scientific rotation.

● Diseases and Insect Pests that cause yellow leaf pests are mainly mantle, which is due in large part to the use of unfamed manure. In order to reduce the damage of mantle and other underground pests, it is also possible to add phoxim to the control of the application of decomposed manure. It has been possible to use thiadiacloprid to add chlorpyrifos to roots. Yellow leaf disease caused by the main diseases, leaf blight, bacterial soft rot disease, etc., effective drugs are copper thiazolyl, cytidine, methamphetamine and so on.

● Other reasons Herbicide harm, low temperature and high temperature will cause the yellowing of garlic seedling leaves; at the same time, in the mother's returning period, if the root absorbs nutrients, the leaves will have “yellow tip”, pay attention to nutritional supplements, and top dressing and Foliar fertilization.

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