The multiple cropping index refers to the ratio of the total sown area of crops to the area of arable land within a year, and is generally expressed as a percentage. The level of the multiple cropping index is restricted by the local sunshine, soil, water conservancy, fertilizer, labor, and scientific and technological conditions. Good sunshine conditions, Long frost-free period, sufficient moisture, reasonable interplanting, etc. are the basis for improving the multiple cropping index.
The multiple cropping index exceeding 100% is correct about the multiple index according to the above definition.