proper yield per mu

例句：

1. 1. The farmer's goal is to increase the proper yield per mu.
   农民的目标是提高每亩产量。
2. 2. The company has invested heavily in research and development to improve the proper yield per mu.
   该公司大力投资于研究和开发，以提高每亩产量。
3. 3. The government has introduced new policies to encourage farmers to adopt more efficient farming practices, whichcould lead to higher proper yield per mu.
   政府已经引入新政策鼓励农民采用更有效的农业实践，这可能会导致每亩产量更高。