There are a number of ways fertiliser or nutrients can be entered into OverseerFM. When entering fertiliser, it is important to take care that there is no double counting as fertiliser nutrients are one of the major sources of nutrients coming into a farm system.
Products are added into OverseerFM and then applied to blocks. Each product that is entered can be applied to any block.
There are 5 options that can be selected in the fertiliser input tab, select the option that is most appropriate for your data. The options are:
- +Add Product
- +Add Lime
- +Add Organic
- +Add Soluble
- +Add DCD
+Add product has preloaded, commonly used fertiliser product such as Urea, Cropzeal 20N and Cropmaster 20.
There is a custom fertiliser option that can be used to enter custom mixes such as a fodderbeet mix and the nutrient content is known. By selecting this option, N,P,K,S,CA,Mg & NA % are entered and the type of the nutrient is also selected.
+Add Lime has preloaded, commonly used lime products.
There is a custom fertiliser option that can be used to enter lime that is not preloaded. It is important this lime is tested to get the Ca & Mg % of the product as these nutrients are required to be entered.
+Add organic gives options for compost/mulches, Dairy factory, Piggery Effluent, Imported dairy effluent, other organic material.
There are some preloaded options such as dairy factory – cheese whey. If you are entering a custom product such as compost/mulches, the nutrient composition of these products is required to be entered. It is recommended products are tested to ensure the correct nutrients are entered.
A product will be entered as compost/mulch if there is no inorganic N (nitrate, ammonium). If inorganic N is present enter as other organic material. The product is split between slow and fast release based on the percentage of N in the inorganic form. Slow release is based on the N content of the organic fraction, soil moisture and temperature.
Dairy factory effluent should be added under the fertiliser input tab, not as an irrigation input. The N in irrigation is treated as inorganic N whereas dairy factory effluent contains inorganic and organic N.
+Add Soluble assumes all nutrients applied are in a water-soluble form. When this option is selected, a name for the product is required to be entered which is determined by the user. When this product is being applied to a block, select the product name from under the Soluble heading. The nutrient component and units of nutrients being applied is entered at the application stage.
DCD reduces the amount of nitrous oxide emitted and N leached.
DCD can be applied up to 3 times per year. Typically, DCD is applied twice per year in April/May and July/August or March and April/May in Southland when grazing off in winter occurs.