用cropping index造句子，“cropping index”造句

3、In land scarce area, methods to increase cropping index, increase crop yield and increase planting area of wheat and sweat potato are adopted in order to increase food energy production.

1、Statistical validation shows that there is great consistency between extracted multiple cropping index and statistical data at different scale. So the results of this dissertation are believable.

2、Under the precondition of high grain production, cropping index and light energy utilization should be put up continuously so as to make agriculture more profitable.