Causes and control measures of continuous cropping obstacles of garlic

Garlic continuous cropping will cause the increase of garlic diseases and insect pests, lead to the decline of the yield and quality of garlic and garlic moss, and seriously restrict the industrial development of garlic, so understanding the causes and control measures of garlic continuous cropping obstacles is very important for the sustainable development of garlic. Next, let's get to know it with the editor.

I. continuous cropping harm

All the year round, the disease occurrence area of garlic is gradually rising. according to the investigation of garlic continuous cropping damage, the garlic continuous cropping land disease is serious for more than 15 years, and the garlic continuous cropping obstacle is not a single disease. it is the comprehensive manifestation of a series of physiological diseases and infectious diseases. The disease generally begins in March, and the main symptoms are leaf chlorosis, yellowing, drying, and death; and root dysplasia, root disc browning and decay, and serious root death; garlic plants are short, garlic heads are thin, and cannot bolting in serious cases, and the yield will generally be reduced by about 30-40%.

Second, the causes of continuous cropping obstacles

1. Influence of pathogen.

Due to years of continuous planting, garlic pathogens and microorganisms remain in the soil, after planting will be parasitic on garlic and a large number of reproduction, the number is increasing year by year. And continuous cropping cultivation, the resistance of seedlings is weak, easily infected with diseases, such as root-knot nematodes in the soil increased exponentially year by year, destroying the root system of garlic, affecting the normal development of garlic, making the disease more serious year by year.

2. Nutritional imbalance

The growth of garlic absorbs a variety of nutrients in the soil, and a little attention to the application of organic fertilizer and micro-fertilizer during fertilization will lead to the imbalance of nutrients needed by garlic, resulting in poor growth and development, decreased stress resistance and weakening growth of garlic. there are physiological diseases of element deficiency.

3. Soil

Excessive application of chemical fertilizer will lead to the continuous increase of soil oxygen content, aggravate soil salinization, soil salt accumulation, increase soil permeability, weak absorption of garlic roots, and reach a certain resistance among elements. affect the absorption of some elements by garlic, hinder the growth of garlic, but also affect the survival, reproduction and activities of beneficial microorganisms, resulting in beneficial micro-flooding. In addition, excessive use of chemical fertilizer will cause soil consolidation, resulting in poor soil permeability and root asphyxiation.

III. Prevention and control measures

1. Crop rotation and crop change

Crop rotation is the best way to solve the harm of continuous cropping obstacles. Compared with other vegetables, garlic needs longer rotation years and generally needs 3-5 years of rotation, otherwise it is difficult to eliminate continuous cropping obstacles. In addition, you can not continue cropping with green onions, small onions, onions, leeks and other onion and garlic vegetables, and avoid onion and garlic crops during rotation.

2. Fertilization

Increase the application of organic fertilizer, improve soil structure, increase the content of soil organic matter, maintain good air permeability, promote root growth, the principle of fertilization should be the combination of organic, inorganic and micro-fertilizer, with organic fertilizer as the main and chemical fertilizer as the auxiliary; chemical fertilizer is mainly high nitrogen and high potassium.

The above is the introduction of the causes and control measures of garlic continuous cropping obstacles. I hope I can help you. If you want to know more about it, please follow us.