1. Rice Variety: Different rice varieties have different grain structures, moisture content, and drought tolerance, which directly affect the weight loss during the drying process. For example, some rice varieties lose moisture more easily during drying, resulting in a higher weight loss rate.

2. Drying Method: The choice of drying method also significantly affects the weight loss rate. Common drying methods include mechanical drying, solar drying, and fire drying. These methods differ in temperature, humidity, and time control, thus affecting the rate of moisture evaporation and the weight loss rate in the rice. For example, mechanical drying can usually control drying conditions more precisely, thereby reducing the weight loss rate.

3. Weather Conditions: Weather conditions such as temperature, humidity, and wind speed also affect the weight loss rate of dried rice. In environments with higher temperatures and lower humidity, the moisture in the rice evaporates more easily, and the weight loss rate may increase accordingly.

4. Rice Drying Equipment: The performance and quality of rice dryer are also important factors affecting the weight loss rate. Advanced rice dryers typically have higher drying efficiency and lower energy consumption, reducing the weight loss rate while ensuring drying quality. In conclusion, the weight loss rate of dried rice is a complex issue influenced by multiple factors. By selecting suitable rice varieties, optimizing drying methods, improving the performance of rice dryers, and strengthening storage management, the weight loss rate can be effectively reduced, thereby improving drying efficiency and the storage quality of the rice.