Planting Guan Xia Xia celery typically begins in early May to late June, a period that coincides with high temperatures and frequent rainstorms. Due to the challenging climate, high-temperature cultivation requires specific varieties that are heat-tolerant and suitable for warm conditions. Commonly selected varieties include Xiaqin, Glass Crispbread, and American Balici Celery, among others. To enhance germination success, seeds are pre-treated by soaking them in fresh water for 12 to 24 hours, then rinsed and the outer layer removed. After drying the surface moisture, the seeds are wrapped in a damp cloth and placed in a refrigerator at 15°C for 15 to 16 hours to promote cold germination. Once sprouted and showing white tips, about 50% of the seeds are sown. The seeding is usually done directly in the field, but seedlings can also be transplanted. To protect against heavy rains, seedbeds are covered with shade nets and plastic films. After sowing, a wet grass mat or shade net is placed on the soil surface. Once the seedlings emerge, the cover is removed, and watering is done carefully to maintain moisture without over-saturation. Drainage should be managed promptly. Seedlings are ready for transplanting after about 40 days.
During summer cultivation, shading is essential for sun-shade celery. It is common to plant directly in greenhouses or under shade nets. Old plastic films can be used as covers, with additional shade nets applied early in the season. Alternatively, live broadcasting can be combined with cover crops like alfalfa, straw, or other materials, or intercropped with tall plants such as cabbage or rapeseed to provide natural shade.
For management, high-density planting is commonly practiced, with 50,000 to 60,000 plants per mu (approximately 667 m²), spaced 8 to 12 cm apart in a square pattern. Planting depth should be shallow, and direct field broadcasting is also acceptable. After sowing, herbicides such as 40% glyphosate at 0.5 kg per mu mixed with 80–100 kg of water are applied to control weeds. Once the plants have developed 5–6 leaves, growth accelerates, and it's important to focus on promoting healthy seedling development. Usually, no additional transplanting is needed. Watering should be done during cooler periods, avoiding the hottest part of the day. Fertilization should be done in small amounts, using nitrogen-rich fertilizers. Topdressing can be applied through irrigation once the plants are well-established.
During the growing phase, applying 2–3 times of boron fertilizer or superphosphate leaching solution helps prevent petiole cracking and rotting, as well as yellowing of the stalks later on. A spray of 5 mg/kg gibberellin 10–15 days before harvest can significantly improve yield and quality.
Harvesting should be timely, depending on the growth stage and market demand. Due to the hot summer climate, which is not ideal for celery growth, summer celery is usually harvested earlier than autumn celery, often at the semi-mature stage.
Pest control includes spraying dimethoate or anti-influx to manage locust infestations. For leaf spot and blight, chlorothalonil or antiviral agents can be used. Virus diseases are controlled with phytosanitary spirit, Antiviral No. 1, or virus A. Soft rot can be prevented or treated with agricultural streptomycin sulfate or neomycin. Regular monitoring and timely intervention are crucial for maintaining healthy crops.
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