1, alfalfa can be planted in spring, summer and fall seasons, spring planting time is usually in March to April, summer planting in June to July, fall planting in August to September. Before planting the need to reclaim the soil to fertilize the fertility, and choose the particles full, disease-free planting, planting to maintain a good and appropriate spacing between rows, keep the soil slightly moist state can be.

2, in the northern region of China, the spring drought with little rain, evaporation, sowing in this season is not conducive to seedling and seedling preservation, and spring sowing weeds are very easy to alfalfa seedlings harm. In summer, there is more rainfall, and at this time the temperature rises, rain and heat in the same season, which is very favorable to the germination of seeds and the growth of seedlings. That is to say, from mid-June to the end of July is the best time to sow alfalfa in the northern region. In cold areas, in order to ensure that alfalfa can safely overwinter in the year of sowing, the sowing time is generally no later than 40 days before the first frost. When planting alfalfa in saline land without irrigation, it is even more important to pay attention to the sowing time. Salt in the soil of saline and alkaline land distribution law changes with the change of seasons, generally in the spring, the salt in the soil is more distributed in the shallow soil layer on the top, and in the fall, it is moved to the deep soil, after sowing in the spring, if it is rained and exposed to the sun, the surface of the soil is easy to form a hard layer of crusting, so that alfalfa seedling emergence is difficult. Therefore, in the saline soil sowing alfalfa time is best to choose in the late summer and early fall, when the rainy season has just passed, the salt in the soil is washed down, and the moisture content of the soil is also more adequate, very conducive to the emergence of seedlings, seedling retention rate is also higher.