In the initial stage of colonization of open cultivation, suitable watering should be carried out to strengthen the cultivator and improve the ground temperature. Suspend the seedlings and then pour the seedlings. Do not seedlings. After irrigating, loosen the soil in time. When the height of the plant is 30 cm, the fertilizer should be attacked with water and fertilizer. Apply 25 kg of ammonium sulfate or 15 kg of urea per mu. Apply fertilizer immediately after top dressing. In the future, water shortage and drought will not occur. Once every 3 to 5 days, water will be poured. After two times, the water will be changed to two days and water will always be maintained. You can also chase the fertilizer one or two times. The cultivation of large, medium and small arch sheds for facility cultivation shall be sealed and insulated at the initial stage of planting. Generally, no air is released. The temperature in the shed can reach about 25°C, and when the heart leaves are green, the temperature drops to about 20°C. If the air temperature exceeds 25°C, the air should be released. With the gradual increase of the outside air temperature, the air volume should be increased. The film at both ends should be lifted, and then the air should be released from both sides. The outside temperature during the day at 18 °C ~ 20 °C, the election no wind sunny day all uncovered plastic film large-scale release, open at night without the cold wave. After the frost period expires, remove the small shed when the light is weak in the morning or evening on cloudy days. The daytime temperature is 22°C～25°C, and the nighttime temperature is 10°C～15°C. When the plants reach 33～35 centimeters, the fertilizer and water attack simultaneously. When topdressing, the plastic film should be uncovered. After the dew on the leaves is dispersed, 25 kg of ammonium sulfate is applied per acre. Water once after top dressing, and then water once every three or four days to keep the noodles moist until harvested. Do not apply diluted feces before harvesting. In the absence of boron, 0.5-0.75 kg of borax can be applied per acre. Fifty-five to 50 mg/kg gibberellin were sprayed once or twice a day before harvest. Chemical Raw Materials,Pvc Raw Material,Dicyandiamide 99.5%,Cleaning Chemicals Raw Material Ningxia Darong Chemicals & Metallurgy Co., Ltd. , https://www.darong-cyanamide.com