multiple-cropping index

例句：

1. 1. The MCI is used to evaluate the effectiveness of agricultural policies in promoting crop diversity.
   多作物种植指数用于评估农业政策在促进作物多样性方面的有效性。
2. 2.The government has introduced a new policy to encourage farmers to adopt multiple cropping practices.
   政府已推出新政策鼓励农民采用多种作物种植方式。
3. 3. The MCI is calculated by comparing the number of different crops grown in a given area with the total number of crops grown in that area over a specific period.
   多作物种植指数是通过比较某一地区在一定时期内种植的不同作物数量与该地区总作物数量来计算得出的。