The main difference between drying and sun-drying alfalfa grass is the drying time, degree of nutrient loss and color change. Generally speaking, the drying process causes less damage to the nutritional content of alfalfa, and the color of the dried alfalfa changes little.

1. Drying time: Drying adopts low-temperature hot air rapid drying process, which has short drying time and high evaporation intensity; sun drying takes a whole day.

2. Loss of nutrients: The drying process causes little damage to the nutrients of alfalfa, while sun drying causes greater damage to the nutrients of alfalfa.

3. Color change: The color of alfalfa after drying does not change much, but the color of alfalfa after sun-drying changes greatly, and may cause nutrient loss and ugly appearance due to sun exposure.

4. Cleanliness: Sun-dried alfalfa may not be cleaned properly, but drying alfalfa does not have this problem.

In summary, compared with sun drying, alfalfa drying has a higher nutrient preservation rate and better color change control.