If the recurring planting patter is 4 main crops and 3 intercrops without affecting the main crop population, then it will be 4:3 additive series. If the main crop population is reduced, then it will be 4:3 replacement series.
The ratio of main crop to intercrop is not affecting the intercropping ,the sown crop of the plot is the mix of the two ,to identify for more further detail we can use high resolution satellite data and detect it.