Bracken, also known as fistula, dragon claw, ruyi, longevity, etc., is a fern, fern, perennial herb, about 1 meter high, underground rhizome growth. The leaves are drawn from the underground stems. When the new leaves are unfolded, the upper leaves are curled inwards and densely villous. After the expansion, they are three pinnately compound leaves. The petiole of the growing leaves is long, [illegal words are masked], and the leaves carry a spore group of reproductive organs containing spores.
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The young leaves, buds, and tender stems of the bracken are rich in protein, fat, amino acids, vitamins, carbohydrates, and various trace elements required by the human body. Rhizomes contain 35% to 40% starch and have high nutritional value. And no pesticides, fertilizer pollution, is a typical natural green food, pollution-free low-calorie diet food. With the improvement of living standards, people's demand for bracken is growing. In the past, ferns had been eating wild vegetables. With the increase in market demand, artificial cultivation began in recent years. Bracken can be artificially cultivated in Datian, small plastic sheds, plastic greenhouses, efficient solar energy-saving greenhouses, warming greenhouses and other places. Different cultivation methods can be selected according to different conditions. The cultivation of bracken in plastic greenhouses can provide fresh bracken all year round, and the economic benefits are high. The cultivation points are:
1. Site preparation and planting. 667 square meters (1 acre) applied 5000 kg of high quality rotted ring fertilizer. Planting requires a complete root system, as far as possible not to hurt the root system, straighten the root system when planting, and pour it once after being planted.
2. Coverage and management. Before the soil is frozen, the temperature of the film is controlled at about 20°C, and the temperature is higher than 30°C. Do not water the seedlings at this time, as long as the temperature is strictly controlled. After 15 days, the temperature may rise to 25°C.
3. Harvesting and processing. It takes 20 days for the shack to sprout, and 10 to 15 days for the first harvest. The harvesting standard is suitable for the unfolding of young leaves and harvested once every 7 days.