Recently, the author discovered in the field investigation that some of the small shallots have some abnormal growth appearances: First, the emergence of the scallions or post-transplantation shows the phenomenon of stagnation and dwarfing of the onion seedlings; second, the color of the onion leaves fades yellowishly. The appearance was poor, and the market price dropped. Third, the harm caused by green onions, onion thrips, leaf miners, lice and rust, was seriously damaged. These phenomena resulted in the reduction of yield and income of some small farmers.
The above-mentioned unfavorable production conditions are often referred to as the Scallion Continuous Cropping Disorder Syndrome. The reasons for the analysis are as follows. First, the cultivation of the same crop year after year will result in the lack of certain elemental elements in the soil and a deficiency of the essential elements; second, the annual application of inorganic chemical fertilizers will destroy the soil aggregate structure, and the degree of salinization will be high. The onion root development will occur. Poor, slow growth of stems and leaves on the ground; Third, the deterioration of the ecological conditions, easy to induce onions, onion thrips, rust and other diseases and pests, so that the leaves of small shallot damage to varying degrees.
The majority of growers can be prevented from the following aspects:
First of all, we must plant rims. For small patches of stale onions, try to adjust the vegetables for leafy vegetables, beans, and melons, and then rotate them for 3 years. Where conditions permit, crop rotations can be carried out. This is a preventive measure with the least investment and good results.
Second, we must increase organic fertilizers. In the face of salinized soil, the first priority is to apply plant-based commodity organic fertilizers or bio-organic compound fertilizers, which have significant effects on improving the soil and releasing certain nutrients fixed in the soil for many years. In order to increase the effect of fertilization, we must first fine-till the soil to enhance the permeability, and then apply different types of organic fertilizers, 150 kg of organic fertilizer for plant-based commodities, or 100 kg of bio-organic compound fertilizer, or farmhouse-built products. Composting 1500 kg homeland fertilizer, with multiple compound fertilizer 25 kg, to avoid partial nitrogen fertilizer. This type of formula can greatly improve the soil fertility and ensure the good growth and development of Scallions.
Third, we must prevent and control major pests and diseases. From the standpoint of agricultural measures, the first is to use summer high-temperature stuffy sheds, or winter plowing soil to reduce the spread of certain germs; second is to increase the use of organic fertilizers containing enzymes, the use of their secretions can inhibit some Harmful bacteria. From the aspect of chemical prevention and control, for green onion, onion thrips, leafminer, etc., 0.5% avermectin EC may be sprayed with 800 to 1000 times solution, or 50% phoxim EC may be used 1000 times for pyrethrin Pesticides 2000 times mixed application. Green onion can be irrigated with 0.5% avermectin EC 800 to 1000 times. Rust can be sprayed with 25% triadimefon 2000 times liquid or 50% thiophanate wettable powder 800 to 1000 times. Http://Content/a03086b7-4fc9-4da8-9798-ee69a272ac74?cType=2
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