2. It is divided into spring sowing and autumn sowing. Spring sowing in Wenquan county is usually in late March and early May, and sowing can be done when the ground temperature is stable above 5℃. Autumn sowing is usually in late August and early September, so alfalfa has a growth time of about 60 days before winter comes. After sowing in autumn, the soil moisture is good, the harm of weeds is light, and the emergence rate and survival rate are high, which is an ideal sowing date.
3. Sowing methods: 1. Artificial sowing is a common and simple sowing method, which is mostly used in small plots, grasslands and slopes of soil and water conservation, and also used for interplanting alfalfa among crops.
4. Fine sand is added during artificial sowing, and the ratio of seeds to fine sand is 1∶6-8. After sowing, water the seeds first. Generally, after being scattered on the ground, it is held on the ground with a rake or branches, which plays the role of shallow covering, and it is better to emerge in the case of heavy rain.
5. The disadvantages of sowing are inconsistent depth, uneven sowing, irregular emergence, no row spacing and difficult management of intertillage weeding; Second, mechanical sowing is suitable for large-scale sowing, which is convenient for later field management, with good sowing quality, high yield and good benefit.