The main reports produced by OVERSEER are nutrient budgets. A nutrient budget is a summary of annual nutrient inputs and outputs, and the various movements of nutrients through the farm or block during the year.
OVERSEER produces budgets for seven different farm nutrients - at both whole farm and management block scales.
A budget is broken down into three sections
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.
The nutrient budget report uses shortened terms to describe the nutrient source or destination. Click on the terms below for their definition.
Nutrients in products sold such as milk, wool, velvet, live weight, or crops.For blocks, the product removal is distributed between blocks based on the intake that occurs for each block. The sum of product removal from blocks may be less than farm product removal if wintering pads/animal shelters are used.
Farm: Supplements sold from the farm, exported crop residues, crop defoliation products, and fruit tree prunings.Block: Supplements, fodder crops and crops removed from the block and fed to animals elsewhere on the farm, or exported.
For crop and fodder crop blocks, organic pool for N is divided into estimated mineralisation from soil organic matter and decomposition from residues, and Net immobilisation (change in soil organic matter levels excluding the mineralisation and decomposition modelled, and includes the balancing error*).
In other blocks, the organic pool is the net change in nutrients (N, P and S) in soil organic matter and the balancing error*. A negative value indicates an addition (net mineralisation) whereas a positive term indicates a removal (net immobilisation).In the farm nutrient budget, the Organic pool includes net immobilisation, including balancing errors* (shown as Organic pool sub-item), and accumulation in effluent storage ponds if they are emptied less frequently than once a year is included in the farm nutrient budget.
The balancing error is the difference between initial estimated inputs and outputs and includes any errors associated with entered data or the estimation of terms in the nutrient budget, and unaccounted nutrients.
To balance the budget (to reduce the balancing error to zero) the ‘balancing error’ is allocated to items within the nutrient budget.
As well as the nutrient budgets, OVERSEER produces other reports to help farmers understand aspects of their farm nutrient management system. OVERSEER reports are constantly changing to fit users’ needs.
*The nitrogen, phosphorus and comments reports are available at both a Farm and Block level.
**The type of Block reports supplied will vary depending on the block types.