Ramie is the top ten oil crops in the world and its use covers energy, environment, medicine, chemical industry and other fields, and its utilization value is extremely high. In the international market, the price of castor oil remains high and demand exceeds supply. Ricinus przewalskii is warm, drought-tolerant, adaptable and stress-resisting, and it can grow on dry and thin lands and dry alkali lands. It is a pioneer crop for soil improvement and comprehensive development of dry land. Planting ramie has become a new way for farmers in the arid regions of northern China to become rich. 1998--For three consecutive years in 2000, we conducted large-scale high-yield cultivation experiments in the Yellow River Delta region. In 1999, we suffered a severe drought and still obtained 200 kg per 667 square meters of output. In 2000, 114 hm2 of production reached 667 square meters. 217.6 kg of rice brings hope for the future development of ramie production. The key cultivation techniques are as follows: 1. In the northern area of ​​fine soil preparation, the suitable sowing date for ramie is April and mid-April. Before sowing, each 667 square meters of base applied fertilizer 2000kg, urea 30kg, superphosphate 50kg, then deep leveling. Large-area cultivation is suitable for deep plowing in autumn to accumulate rain and snow, kill germs, clear up early springs, and preserve rice. High-salinity plots should be sowed with salt and then sown. Insufficient lyric plots should be built up. Second, seed processing Use tall, high-oil hybrids. Rugao 3 and other excellent hybrids. 2. Selected germination. Select the same size and full of seeds for field use, soaking with warm water before planting. Third, field management Closely planted. Moderate lyrical conditions, broadcast depth 5-7cm is appropriate. In general, 700-1000 holes per 667 square meters, sowing 2-3 seeds per hole. After the sowing of dry land, mulching can be carried out to suppress the increase of salt and ensure that all seedlings are sown in order to ensure normal growth at the seedling stage. Immediately after emergence, seedlings, seedlings, 2-3 leaf stage Dingmiao, Liu Miao 700-1000 strains. 2. Cultivating earth. The ramie plant spacing is large, and the exposed fields easily cause water evaporation and weed growth. Immediately after emergence, cultivators loosen and weed the soil. Three times of cultivating in the seedling stage, the last time to carry out soil cultivation, in order to prevent the late castor net lodging. 3. Timely topping and squatting. Pruning can improve the conditions of ventilation and light in the field, and early ear ripening. Pruning is mainly to timely top, hit the tip and remove the second branch. The time to top and hit the top of the group is appropriate to push 60d before the local early frost period. The northern region is generally from August 20 to September 5. To hit a small top, only remove the newly opened leaflets and growing points. 4. Fertilizer management. Emergence requirements have sufficient bottoms, and lack of water must be filled. After entering the flower and fruit period in mid-June, the demand for fertilizer and water increases, and fertilizers should be recovered in time. Top dressing is usually carried out when young fruit is formed in the inflorescence of the main stem, and topdressing urea 8-10kg and potassium fertilizer 4-5kg per 667m2. In case of drought, it should be properly watered, and it should be drained in time when encountering floods. 5. Pest Control. The diseases of ramie mainly include disease, wilt and leaf blight. Diseased leaves and diseased plants must be timely picked, removed, and burned. In severe cases, carbendazim 250 times spray control. The main insect pests are ground tigers, cotton bollworms, and night robbers. According to the occurrence, timely drug control. Fourth, timely harvest ramie fruit peel began to light brown when it is the best time to harvest, harvest too late easily cause pods fall off. The harvested pods should be stacked 2-3 days before the skin becomes soft and the color is dark, then exposure threshing.
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