A review is essential to final assessment of a nutrition manager's success and forms the basis for future improvement. Crop yields are essential to each review, but these have multiple effects other than nutrition. Hence lab analyses of harvested materials are also crucial. Measurements of nutrient removals in harvested materials enable calculation of soil nutrient balances, and efficiencies of nutrient applications. Nutrient concentrations of harvested produce then also show whether crops captured insufficient, adequate, or excess nutrients. Standard nutrient concentrations are generally over-estimates, so measuring nutrient concentrations of harvested produce provides more accurate values, and on average leads to reduced fertiliser use in the following season. By identifying nutrient shortfalls and surpluses, the review step can support farms in optimising nutrient applications and build confidence in future crop nutrition planning. Thus reviewing is key to effecting progress towards maximum profitability and minimum environmental impacts of crop nutrition.