A nutrient budget is a tabulation of annual inputs and outputs of nutrients for blocks and the
farm, assuming that management is constant. Internal transfers (changes in long-term storage
pools due to changes in soil organic matter, weathering, adsorption, etc.) are considered as
outputs.
This chapter focuses only on the block nutrient budget. The primary difference between block
types are the processes considered, and the way parameters for the processes are derived.
The Technical Chapter can be found here