Management skills of cucumber in shed after Spring Festival

In the middle and last ten days of February, most greenhouse cucumbers enter the peak period of melon production, and the demand for fertilizer and water also increases gradually. therefore, cucumber topdressing should be carried out after the end of February. Generally, urea 20 kg, potassium dihydrogen phosphate 5 kg 8 kg or potassium sulfate compound fertilizer 30 kg 35 kg was applied every 15 ha, once every 20 days. According to the situation, combined with watering, waterproof rinse with water to apply rotten human feces and urine, bean cake water. At the same time, every 10 to 15 days, combined with disease prevention and treatment, extra-root topdressing can be carried out by spraying 0.2% potassium dihydrogen phosphate solution or sugar nitrogen solution prepared with sugar, urea, potassium dihydrogen phosphate and water according to the ratio of 1 to 1, 1, 0.2, 100, or 500 times, and so on. The application of carbon dioxide gas fertilizer at the end of February and the beginning of March could obviously prevent premature senescence, improve stress resistance and prolong fruiting period. In the middle and later period, the watering times and water quantity should also be increased, but must be carried out according to the actual situation, in case the ground temperature drops too much, generally keeping the ground temperature not lower than 15 ℃ after watering. After adjusting the temperature for 3 months, the external temperature gradually increases. In this period, we should make full use of the grass curtain and the opening and closing vents to adjust the temperature in the greenhouse, so as to keep the temperature in the greenhouse at 26: 30 ℃ during the day and 12: 14 ℃ before pulling the curtain in the morning, so as to facilitate the normal growth of cucumber. Through pruning and falling vines, the height of the plant is kept at about 1.3 meters, low in the south and high in the north, in order to receive light. The specific method is to drop the vine at the base of the cucumber stem and dish it on the ground, so that the growth point of the cucumber plant is at a height of about 1.3 meters, keep the top of the cucumber in the whole greenhouse basically in the same plane, and remove the old leaves and diseased leaves. Each plant can retain more than 20 effective leaves. The main diseases of cucumber in this period are downy mildew, corner spot, gray mildew, powdery mildew and so on, and the main pests are aphids, whitefly, Liriomyza huidobrensis and so on. The above diseases and insect pests should give priority to prevention and comprehensive control. According to the experiment, it is better to control the above diseases, such as downy mildew, bengnuo, gray mildew, white powder and so on. Avermectin and aphids are ideal for the control of the above insect pests. Picking melons is generally appropriate to keep 2 or 3 expanding strips per cucumber plant, the strong ones can stay late to pick, and the weak ones can stay and pick early.