How to grow good coriander in summer

Growing coriander in summer is highly effective, but it is not easy to manage, and it is easy to pump when the temperature is high. When the temperature exceeds 30 ° C, it stops growing.

First, choose fast-growing, heat-resistant, late-pumping, good quality, strong flavor, few diseases and insects, and strong adaptability, such as Beijing coriander, North China big leaf and so on.

1. Soaking seeds to promote germination. Because the summer temperature is high and the water in the soil evaporates quickly, in order to ensure the emergence of seedlings, the seedlings are soaked and germinated before sowing, and the seeds are first separated to separate the two seeds in the fruit. Then soak it in clean water for 4-5 hours, put it in a cloth bag and set it at room temperature for hydration and germination, and soak it with water every 2-3 days. Generally after about 10 days, the young roots can be taken out for sowing when they are white.

2. Live broadcast in due course. Coriander is cold and cool, and the growth temperature is 17-20 ℃. The requirements for planting coriander in summer are not strict. The direct seeding in summer open field in southern Shandong is usually suitable for late April to early June, and a batch is usually planted every 5-7 days. Harvested 40-50 days after sowing.

3. Fertilize the land. 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. Plots with high organic matter content are more suitable for coriander growth, so 3000 kg of farm manure and 30 kg of high-nitrogen ternary compound fertilizer are generally applied per acre. Spread the fertilizer evenly, rotate the land, and make flat vinegars growing 5-6 meters broadcast.

4. Fine seeding. In summer, it is better to plant coriander evenly. Generally, about 2 kg of coriander is used per mu. The method of spreading is "first broadcast two remnants and one remnant". Place the covering soil for the first sowing on the retaining surface on both sides, and then irrigate with sufficient water. After the water has soaked, sow the seeds evenly, cover the soil 2 cm after sowing, and then sow the remaining empty soil. Precast is the same. After sowing, it will be lightly patted and covered with grass to moisturize and help seedlings unearth. When most of the seedlings are unearthed, the covering should be removed. It usually emerges about 7-10 days after sowing. After all the broadcasts were carried out, a repression was carried out. If the weather is dry and the soil humidity is low, it will affect the emergence of the seedlings.

5. Field management

Coriander is afraid of high temperature and strong light. Where conditions permit, you can consider covering shading nets on the cultivated loquat to reduce the temperature and shade, which is beneficial to the growth of cilantro, increase yield, improve quality, and increase 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 irrigate, less watering at seedling stage, and to maintain sufficient water and fertilizer supply during the growing season to keep the soil constantly moist. Topdressing depends on the level of soil fertility. Combined with watering, the main application is urea or nitrogen and potassium fertilizer. Generally, 15 kg of fertilizer is applied each time and topdressing is performed twice.

6. Proper harvest

The coriander grows faster in the summer, and should be harvested as early as possible to meet the harvesting standard to prevent the phenomenon of bolting. When the plant reaches 20 to 25 cm in height, harvesting can begin. In order to improve its commerciality, the harvest time is generally after 6 pm or early in the morning, and sold in time after harvest.

Disease and pest control of coriander

1.Sclerotinia

â‘  Rotate crops or soil disinfection, use 40% pentachloronitrobenzene, 1 kg per 667m2, add 50 kg of fine soil, mix well and apply to the soil.

â‘¡ Dress seeds with disease-free seeds or chemicals.

2. Leaf blight and spot blight

These two kinds of disease spots occur, but once they occur, the disease quickly spreads, causing serious harm. It mainly damages the leaves. The leaves become yellow-brown after being infected. When the temperature is high, the diseased part rots. It seriously infects the tender stems down to the heart leaves along the veins, causing serious reduction in yield. Therefore, these two diseases must be specially controlled. These two diseases are new diseases in our district, which may be seed-borne bacteria, so we take preventive measures mainly on seed disinfection. The method is to soak seeds with 500 times solution of "Kebutan" or "Carbendazim" for 10-15 minutes. Rinse and sow. When the disease is found, spray and control it timely. Use 600-800 times solution of carbendazim, 600 times solution of mancozeb, 800-1000 times solution of 70% methyltobutin, and 500 times solution of chlorothalonil. The effect is better.

3. Root rot

It is more common in low-lying and moist fields. After the onset of coriander roots, the main roots are yellowish brown or tan, soft rot, no or almost no fibrous roots. The roots of the plants are broken as soon as they are pulled by hand. Its commercial nature. The control method is to avoid planting on low-lying land as much as possible, and the humidity cannot be too long for a long time. The main control of the pesticide is soil treatment. The soil can be mixed with 1kg of carbendazim and 50kg of soil. It can be sprinkled in the sowing ditch before sowing. In the disease-prone area, it can be irrigated with 300 times of heavy cropping solution.

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