To add the output of the plant by adding specific elements of an output may not succeed as much as it should because most plants have the potential to compensate for the output element.
To increase the productivity of plants by specific elements of the product may not be successful as it could be because most of the plant's potential compensation to each of the elements of the output.
Increasing the yield of crops by specific increase the yield components of one may not succeed as much as it should because most plants have the potential of compensation of yield components.