Fertility Analysis: Removal

A removal only recommendation can be a good fit when a field is devoid of soil data or the user desires to only replenish used elements without building up soil test values. Removal sources can be a flat crop removal, removal from measured yield or from yield potential layers.

Setting up Removal Analysis

1. From the Fertility tab, expand the profile tree down to any Farm  level.
2. Select any field(s) by selecting their corresponding check boxes [1].
   Please Note: Fields with both yield and soil samples display a check box with no coloration. Fields with only Soil Sample data will display brown coloration in Fertility, whereas fields with only yield/yield potential data display in green. Soil sample data is not used for this analysis type, if you would like to reference soil data, consider using Fertility Analysis: Soil Fertility instead.
3. Select the Analysis: Removal [2].
4. Select desired element [3], then click "Add Element" button [4].
   If desired, repeat this step for each desired element.
5. If desired, repeat step #5 for each desired element.
6. Select "+ Add Removal Source" [5].

Removal Functions Explained

Adding a removal source will increase the fertilizer recommendation based on what may have been removed from the soil by a previous harvest. Removal values are crop-specific, for more information, see Location Preference - Removal.

1. After selecting "+ Add Removal Source" [5] the Add Removal Source window will appear.

2. If desired select "Add Flat Crop Removal" then select a crop and removal value [6].

    Please Note: Up to two flat crop removal values can be entered with the "Add Second Crop" option [7].

3. Another option is to select "Add Crop Removal from Yield" then select the specific yield layer [8].
4. The third removal option is "Add Crop Removal from Yield Potential" [9].
5. At least one removal source should be selected, however multiple sources may also be selected, after configuring removal source(s), select "OK" [10].

Elemental Inputs Explained

For each element selected [3] then added with the "Add Element" button [4] above, there will be an elemental selection tile in the right pane.

• Product: The Product drop-down menu determines which fertilizer product should be used for the element. Products are added to these lists via the Product Management tool. Please Note: The default product selected  for each element, as well as Max Rate, Min Rate, and Switch Rate defaults on a per-product basis and App Cost can be set within the Fertility tab of the Location Pref Tool. Product price defaults can set in the Product Management Tool. The value of any of these inputs can be modified regardless of whether defaults are present or not.
• Max Rate: Setting a max rate causes the Fertility request to set any calculated output that would have exceeded the max rate to the max rate instead.
• Min Rate: Setting a min rate causes the Fertility request to set any calculated output that would have been lower than the min rate to be 0 instead.
• Switch Rate: Setting a switch rate tells the system how to handle calculated values that would have landed between the minimum rate and 0. For example, if the minimum rate is 80 lbs per acre, and the switch rate is 60, then everything larger than 60 and less than 80 will be set to the minimum rate, and everything smaller than 60 will be set to 0. To enforce minimum rate as the absolute minimum (eliminating all 0 application areas) for the entire field, set the switch rate to 0, leaving the switch rate blank will set every area with a calculated output lower than the min rate to 0.
• Multiplier: Inputting a multiplier causes the recommendation to be multiplied by whatever value is in the Multiplier input field. Inputting a decimal value can cause the recommendation to become divided as well. For example, inserting a Multiplier of 2, will cause the recommendation to be doubled, whereas inputting a Multiplier of .5 will cause the recommendation to be cut in half.
• Subtract: Inputting a value into the Subtract input field causes that amount of raw element to be deducted from the recommendation.
  Please Note: A negative number can also be input here to cause a raw elemental value to be added to the recommendation.
• Price : Price will be included on the recommendation PDF if it is input in this input area.
• App Cost: This cost refers to the cost of applying the recommendation to the field and is listed on the corresponding recommendation PDF.

Report Options

• Point Overlay: Point overlay refers to the overlaid values displayed within the Map portion of the Fertility Analysis PDF, as well as the Fertility Map screen. 
  
• More Options: (Show/Hide): The default view has these options hidden, selecting the blue text displays additional options:
  • Flat Rate Comparison: This option reveals extra area input options. Once an area is selected, this option creates a section on the Fertility Analysis PDF report that will display what the totals would have been had they been run at a flat rate instead of a variable rate.
  • One Field Per Report: This option limits the report to one field per application report, and also creates separate application files per field.
  • Email Results: This option will email results rather than generating the output "Live" and can be useful for very complex recommendations that take a considerable time to generate.
  • Add Note to Report Header: This option once clicked, reveals a Note input line. Inputs submitted within the Note input line appear at the top of the Fertility Analysis PDF, appearing after the Grower> Farm and Field information.
  • Use Zone Input: Upon clicking "Submit Rx" [11] when "Use Zone Input" is checked, the system will open the Zone Input Tool set up window. Use the drop-down menu to select the management zone layer needed, and the Use Zone Tool window will update with the details of the zone selected. Use the "Equ Var" drop-down menus to select the equation variable that the data column values represent. Click "Submit" on the Zone Details window when finished. For more help with Use Zone Input option, see help section Using Management Zones to Add Multiple Yield Goals
    Please Note: Use Zone Input is only available to define removal yield spatially for Flat Crop Removal source.
  • Create Blend: This option creates a Blend table on the resulting Fertilizer Application Summary page, that details the weight of nutrient from each product.
  • Exclude Cost On Report: This option is very straightforward in causing internal costs to be excluded from the Fertility Analysis report.
  • Disable Zone Smoothing: The FieldAlytics system performs an interpolation between zone areas to mitigate harsh stops and starts within the controller. Selecting the Disable Zone Smoothing option turns this interpolation off.
  • Disable Interpolation Across Polygons: The FieldAlytics web system will perform data interpolation across boundary polygon lines if the sampled point was close enough to another point to be considered. Selecting Disable Interpolation Across Polygons, turns this cross polygon interpolation off.
  • Utilize Controller for Output: This option, when selected causes the fertility VRA projection and resulting reports to display in a manner that is closer to the limitations of what a controller can spread.
  • Define Report Note: Clicking this text link opens a "Define Note" input window. Notes entered into the Define Note input window will appear in a "Notes" section on the last page of the Fertility Analysis PDF.

Click " Submit Rx" button. [11] Recommendation will process, and then will display on map. Additional functions display in black "Prescriptions" box. See subsection "Prescriptions Box Options Explained" in help topic: Fertility Overview - Options and Functionality