Creating a Two Year Fertility Spread Yield Targets/Goals

Fertility recommendations utilizing Yield Targets or Yield Goals and multi year spreads can be setup if you have the Yield Goal or Yield Target setup utilizing one of the following methods:

• Yield set from crop zone property.
• Yield set for the commodity or default rate for the field.
• Yield set in user created calculator.
• Using a layer formula expression/calculator in your nutrient recommendation scripts.
• YieldTarget or YieldGoal setup as an attribute with values assigned if using a region/zone layer.

Please follow this link for additional help:  Options for Setting Yield Goals/Targets in AgStudio for Fertility

When attempting to use this feature for a fertility recommendation utilizing yield target variables for two years a limitation is reached with the inability to set a Yield Goal two years in advance. 

Scripts can be established  in Advanced Nutrient Recommendations to accommodate a two year fertility spread and still utilize variable Yield Targets across zones.

Scenario 1

A grower has a crop rotation where the previous crop is the same as the 2nd year crop. For example the grower planted soybeans in 2020, corn was planted in 2021, soybeans will again be planted in 2022. For this scenario a user could establish a script in crop year 2021. For this scenario, set two Commodities in the Nutrient Script Editor. For Commodity one use the following settings.  Name/Corn, Year/Current. For Commodity two use the following settings. Name/Soybeans, Year/Current - 1. Note the sequence is set to 1 for both commodities and Yield Goal Source is Yield from layer using the YieldTarget attribute from the Decision Zone layer. The script will utilize the current year’s Yield Goal for corn and the previous years Yield Goal for soybeans.

Scenario 2

A grower is not in a crop rotation where the previous crop is the same as the 2nd year crop. Here sequencing can be utilized. In AgStudio place both crop zones in the current year. When placing the crop zone for the crop to be planted in the current year, the crop zone is set to sequence 1. When placing the crop zone for the crop to be planted in the second year, the crop zone is set to sequence 2. Use your Yield Target script, edit the cropzone yield goal, or edit commodity yield goal for both crop zones.

In the Nutrient Script Editor set two Commodities. For Commodity one use the following settings. Name/Corn, Year/Current. For Commodity two use the following settings. Name/Soybeans, Year/Current. In this script set the 2nd year crop to sequence 2. Note in both Commodities the Yield Goal Source is Yield from layer using the YieldTarget attribute from the Decision Zone layer. The equation will utilize the appropriate Yield Targets and associated crop removal rates. The results are combined and placed underneath the sequence 1 crop zone. After verifying the recommendation accuracy the sequence 2 crop zone can be removed from the domain tree.