1. Original plant seed

The traditional method of seed retention. This method can be sown in the normal season, the characteristics of varieties, characteristics can be fully expressed, easy to remove the inferiority, but the land use rate is low, the seed yield is low, affecting the stay in the hemp fiber yield and quality.

2. Tip seed

Use of hemp stems in high temperature, humid conditions easy to grow adventitious root characteristics, choose a good single plant, with a sharp knife diagonally split the tip, cuttings directly in the soil loose wet seed retention in the field of seed retention method. Pay attention to the bud period to take cuttings, tip length 20cm, insertion depth 6cm. choose a good seed field, strengthen the fertilizer management. This method can solve the contradiction between seed saving and fiber production, improve seed yield and quality. But the land utilization rate is low, the tip is not easy to survive, stay in the seed hemp production is low.

3. Summer sowing seeds

(late fall seeds) for red hemp breeding the most common method of seed retention. Pay attention to the timely sowing (before mid-July), selecting a good breeding field, applying sufficient fertilizer, early fertilizer, to prevent pests and diseases. This method can improve the land utilization rate, easy field management, to avoid typhoon damage, high seed yield and good quality (than spring hemp can increase production by 30% to 40%).

4. Short-light seed production

Northern hemp area to ease the production of red hemp seed or "southern transfer of seeds" of a kind of seed retention technology. Attention to timely sowing, strengthen the propagation of field management, timely shading and short-light treatment. Advantage is that the local seed production and high seed yield, good quality, high purity, easy to control the occurrence of anthrax.