When there is a rotating fodder crop that rotates through multiple blocks, the model allocates a proportion of the fodder crop to each block with a fodder crop rotating through it.
The model is unable to distinguish which specific fodder crops are rotating through which specific blocks i.e. if you have a kale crop rotating through Block 1 and a turnip crop rotating through Block 2 the model will allocate a proportion of the kale crop to be from Block 1 and a proportion from Block 2 (Same for the turnip crop)
The proportion allocated depends on the size of the blocks they are rotating through.
For Effluent - This causes issues with areas "not adding up" when rotating fodder crops are not receiving effluent but the blocks they are rotating through are. Or if the rotating fodder crop is receiving effluent but all or some of the blocks they are rotating through are not.
For irrigation - This causes issues with areas "not adding up" when rotating fodder crops are not receiving irrigation but the blocks they are rotating through are. Or if the rotating fodder crop is receiving effluent but all or some of the blocks they are rotating through are not. Or if different rotating fodder crops are receiving different irrigation systems.
Guidance on the irrigation page states:
For pasture blocks that have fodder crops, the irrigated area is adjusted to remove the fodder block area. The area removed is based on dividing the total fodder area by the total pastoral area for the farm.