1. Planting time: Purple alfalfa can be planted in spring, summer and autumn. Weeding should be paid attention to when sowing in spring, and high temperature burns should be paid attention to in summer. It is generally appropriate to plant in autumn, and the specific planting time should be decided according to the local climate.

2. Seed treatment: the seeds should be cleaned and dried to make the purity of the seeds reach 90%. When the conditions are suitable, qualified seeds can be inoculated with rhizobia, and if they do not have the relevant conditions, they can be sown directly.

3. Soil preparation before sowing: apply 50 kilograms of calcium superphosphate as base fertilizer to each mu of the planting plot, then carry out deep ploughing after fertilization, remove weeds, rake and grind and sow.

4. Sowing method: Spring sowing and autumn sowing of purple alfalfa lodging should be carried out in time while the soil moisture is available, and precision drilling is better. Rake and grind in time after sowing, which is beneficial to moisture conservation.

5. Field management: After the emergence of alfalfa, weeding should be carried out in time, and pest control should be carried out. Common diseases include mildew, embroidery and powdery mildew. Irrigation should be carried out in time during drought, but it should not cause water accumulation.

6. Harvest in time: harvest at the initial flowering stage, that is, at 50% flowering stage. At this time, grass is the most abundant in nutrition, and the yield of stems and leaves is high and easy to digest, and 4-6 crops can be harvested every year. After harvesting, the alfalfa lodge is exposed to the sun to reduce the water content and store it.