harvest index

例句：

1. 1. The harvest index for the region has increased significantly in recent years.
   该地区的收获指数近年来显著提高。
2. 2.The government is using this index to monitor the impact of climate change on agriculture.
   政府正利用这一指数来监测气候变化对农业的影响。
3. 3.The harvest index is a crucial indicator for farmers to plan their crop rotations.
   收获指数是农民规划作物轮作的重要指标。