How to grow summer coriander: more knowledge about cultivation of summer coriander

When coriander is planted in summer, the sowing date is not strict. Generally, it is sown from May to June and harvested 40-50 days after sowing. Summer sowing coriander is highly effective, but it is difficult to cultivate. Coriander is a vegetable that enjoys a cool climate. Above 30 ℃, it will stop growing, so pay attention to these points when planting:

1 Select the superior species. Choose drought-resistant, fast-growing, hard-to-pump varieties, such as Beijing coriander, American large leaf coriander, and Thai heat-resistant large-grain coriander.

2 Seed treatment. In summer, the temperature is high, and the water in the soil evaporates quickly. In order to emerge early and the whole seedlings, the seeds must be treated before sowing, that is, the peel is first crushed, and then the seeds are soaked to promote germination. The seeds can be soaked in cold water for 4-5 hours. The seeds are packed in cotton bags and placed in a dark and humid environment at a temperature of about 15 ° C for 7 days (such as in a cellar or crock). When the seeds are exposed, they are sown.

3 Fertilize the site. Choose soil with fertile soil, water and fertilizer, convenient drainage and irrigation, and well-ventilated soil. It is best to have no parsley plots within 3 years. Apply 3,000 kilograms of farm manure per acre and 30 kilograms of high-nitrogen ternary compound fertilizer. Spread the fertilizer evenly, rotate the land, and make a 5-6 meter flat hoe for sowing.

4 Fine seeding. Sowing method is often used in production, and water is poured into the pan before sowing. After the water infiltrates, mix the seeds with sand, spread them evenly, and cover with 1-2 cm thick fine sand. After everything is broadcast, suppress it with a hoe. Covered with old grasshoppers, straw and other coverings, it can play a role in keeping the temperature down. Generally, the seedlings can be released about 7 days after sowing, and the cover is removed when most of the seedlings are unearthed.

5 Field management. Coriander is afraid of high temperature and strong light. Where conditions permit, it may be considered to cover shading nets on the cultivated loquat to reduce the temperature and shading, which is beneficial to the growth of cilantro, increase yield, improve quality, and improve planting benefits. Fields without closed herbicides were combined with paddy plots at the seedling stage to remove field weeds in time to prevent competition with cilantro for fertilizer and water. The principle of fertilizer and water management in coriander during the growing season is not to dry and not to water, and less watering at seedling stage, to maintain sufficient water and fertilizer supply during the growing season. Topdressing depends on the level of soil fertility. Combined with watering, topdressing urea or nitrogen and potassium fertilizer is the main method. Generally, 15 kg of fertilizer is applied each time and topdressing is performed twice.

6 Control pests. The main pest of coriander over the summer is aphid, which is extremely common under high temperature and drought conditions. Generally, the juice of coriander leaves is sucked, resulting in reduced yield. 10% imidacloprid 800 times liquid spray can be used for prevention and control, spraying once every 7 days and spraying 2-3 times continuously.

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