Early Cucumber Management

1. Seedling management Seedling management mainly refers to light, temperature and moisture management. Illumination is the main source of calorie for seedbed and it is the basis for plant growth. Therefore, sufficient illumination should be ensured as much as possible during the breeding process. The temperature needs to be adjusted by covering the straw curtain in the evening and cooling the air in the daytime. The temperature control should be based on the following principles: Seedlings should be maintained at 28°C to 30°C. Cotyledons unearthed to the first true leaves appear around 25°C during the day and 13°C~15°C during the night. The minimum temperature in the early morning is not lower than 10°C. The first true leaf was unfolded until 1 week before colonization, during the day, 25°C to 30°C, and at night from 13°C to 15°C. The minimum temperature in the early morning was not lower than 10°C. Plant seedlings 7 to 8 days before planting, gradually increasing the amount of air release. Until a few days prior to planting, both day and night were grown under open air conditions in the absence of frost damage to facilitate adaptation to open field conditions. Second, the principle of water management is to keep the soil in the nursery and seedlings dry and wet, and prevent excessive drought. If leggy phenomenon occurs, it can be solved by increasing ventilation and controlling temperature. Planting ridges, covering the mulch before planting. Line spacing 65 cm 33 cm. After the frost in mid-May, it was planted in the weather with warmer temperatures. Pay attention to filling enough water at the time of planting to facilitate hair rooting. Extend the vines and pay attention to timely scaffolding and binding vines. III. Disease Prevention and Control: The major diseases of cucumber in early-ripening open fields include angular spot disease, downy mildew and black spot disease. Keratoderma: Leaf lesions are polygonal, smaller, yellowish-brown, with white bacteria appearing on the back of the leaves when the humidity is high, and the lesions appear translucent thin paper when dry. The disease can be controlled by agricultural streptomycin, can kill and other agents. Downy mildew: lesions were polygonal, yellow-green, followed by light brown, late lesions converged, full leaf curl. On the back of the lesion, a dark gray moldy layer grows on the back of the lesion, and the pesticides with better control effect on the disease include anti-virus scorpion and gram dew. Scab: Central lesions are round to elliptic, pale yellow-brown, not limited by the veins, and are star-shaped at later stages. In the early stages of melon damage, near-circular dark green lesions were formed. After being hard, they were easily detached, and the diameter of lesions was about 3 mm. The disease is better controlled by Fuxing

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