In recent years, the area where scallions are planted on the outskirts of cities and towns has been rapidly expanding. Some village groups have concentrated on the cultivation of scallions in an area of ​​up to 1,000 mu. Due to the good market conditions, the income of peasants who grow scallions is also considerable. Chives produced from 1500 to 2000 kilograms, income up to 6000 to 8,000 yuan.
However, we have found that there are often farm households whose production has been reduced due to technical errors in cultivation and management, mainly in the following areas:
One is to use excessive fertilizer. Although the season of the sowing of the onion or the transplanting of the ramets is very flexible, the growth period of the scallions in each season is relatively short. Some farmers often produce one-time base fertilizer or chase the excessive amount of chives for the high yield in the season. Chives are very vulnerable to fertilizer damage, causing the green onion leaves to lose green and turn yellow, and eventually wither.
The second is the obstacles. Chive seedlings or ramets transplanted to survive the survival of the seedlings, there stagnation growth, onion leaf color fades dark gray, onion seedlings significantly dwarf, low yield, poor visual effect, market competitiveness decline, this is mainly for many years in Chives are planted in the same plot. The lack of certain elemental elements in the soil leads to deficiency of the disease, and some of them are also known as palsy disorders or physiological disorders.
The third is serious disease. Onions, onions, thrips, spider mites, rust, and downy mildew occur at the same time, which is caused by the deterioration of the ecological environment after neglect of cultivation and management.
Corresponding measures:
First, carefully organize rim planting. In the places where chives are grown, there are also other habits of planting other vegetables. For fields with long stagnant shallots, adjust the vegetables for leafy vegetables, beans, and melons as soon as possible, and then change them again in three years. Where there are better water conditions, crop rotations can also be implemented.
Second, increase organic fertilizer. For the cultivation of scallions or salinized soil for many years, all methods of decomposing farm organic fertilizer, livestock excrement or bio-organic fertilizer, and bio-organic compound fertilizer shall be applied to improve the soil and release certain elements fixed by the soil for many years. The fertilizer has obvious effects. Generally when applied organic fertilizer should be applied with 15 ~ 20 kg of inorganic compound fertilizer per acre, the more appropriate the situation, the better the effect.
Third, pay attention to the prevention of pests and diseases. The first is the application of bio-organic compound fertilizers containing enzyme bacteria, which contain enzymes and other beneficial bacteria secretions, can inhibit some diseases; Second, the use of winter and spring chives harvest free time, ploughing Ling sun soil, but also Inhibit certain diseases and pests. From the aspect of chemical prevention and control, 50% insect-resistant WP, 40% dimethoate, 90% crystal trichlorfon, and high-efficiency chlorofluorocarbon can be used for green onions, green onions, thrips, and leaf flies, respectively. Cypermethrin pesticides. For rust, spray 25% triadimefon 2000 times and 50% thiophanate 800 to 1000 times.
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