The summer growth of the lotus is critical. According to the practice, the key technology of the summer tube is briefly described as follows.
One is water transfer. With the growth of floating leaves after planting, the water level can be raised gradually. After a large number of leaves grow, the water depth can be maintained between 40 cm and 60 cm. Although lotus is a aquatic plant, but also afraid of a significant change in water level in summer should prevent the sudden rise in water level should be prepared in advance to prevent flooding.
The second is fertilization. In the season of vigorous growth, lotus hi-fat can directly insert rod-shaped chicken droppings into the mud near its roots to meet its nutrient requirements. Fertilizer can be applied every 20 days from the beginning of flowering.
The third is light. It is best to spend 8 hours or more of direct sunlight on the lotus flower. If the light is sufficient, the plants will grow stronger and stronger; otherwise, they will grow slowly and become dumb buds.
The fourth is wind protection. Plants that encounter windy, windy lotus plants can be easily scraped. Therefore, preventive measures must be strengthened to avoid sudden winds blowing the lotus or cause unnecessary losses.
The fifth is suitable temperature. Lotus blossoms in high temperatures and flourish. At present, most of the lotus cut flowers produced in China are grown under natural conditions at 20°C-30°C. The rapid flowering temperature is 25°C-35°C. Therefore, higher temperature is required for growth in summer.
Sixth is weeding. During the entire growth process, mosses, water grasses, etc. in the water should be removed at any time to prevent them from competing with the lotus, compete for fertilizer, and compete for space.
Seventh is prevention. Lotus summer susceptibility to spot blight mainly occurs in rainy seasons where most infected areas are leaves with just long leaves that do not catch disease. The main symptom is the initial appearance of irregular retrograde lesions on the surface of the leaves that turn dark brown later. Black spots can be seen in the necrotic area. The prevention and control method is to promptly remove the diseased leaves from incineration, especially when it is appropriate, topdressing potassium dihydrogen phosphate and diammonium phosphate. It can also spray 70% thiophanate WP 1000 times per week.
Eight is pest control. Lotus is susceptible to Spodoptera littoralis. Generally, from June to July, its larvae feed on the lotus leaf and leave only the veins of the leaves, causing the affected leaves to be window-sanded and sometimes able to eat the entire leaf. The use of diluted sugar water plus trichlorfon to trap and kill adult larvae during the spread of the evening spraying 50% dichlorvos EC 1000 times at the same time to protect Trichogramma, parasitic flies and other natural enemies rely on them to eliminate Spodoptera litura.
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