Some important formulas

1. Cropping index:

• The number of crops grown per year on a given piece of land multiplied by 100 is cropping

i.e. Cropping index = Total number of crops/Net cultivated area x 100

2. Cropping intensity:

• Cropping intensity indicates the number of times a field is grown with crops in a year. It is
• calculated by dividing gross cropped area with net area available in the farm, region or country.

i.e. Cropping intensity (CI%) = Gross cropped area / Net area available x100

3. Land equivalent ratio (LER)

• LER is the relative land area under sole crops that is required to produce the yields achieved in

i.e. LER = Y_ij /Y_ii + Y_ij/Y_jj

Where, Yij = Yield of inter crops, Yii and Yjj = Sole crops yield of component crops.