i just want these to not be lists

app.py

@@ -87,8 +87,8 @@ class Planting(BaseModel):
     crop: List[str] = Field(..., title="Crop", description="A list of the crops in this planting")
     variety: List[str] = Field(..., title="Variety", description="A list of the crop varieties in this planting")
     logs: List[Log] = Field(..., title="Logs", description="A list of all the logs that are associated with the farm activities")
-    soil: List[Soil] = Field(..., title="Soil", description="Information about the soil associated with this planting")
-    harvestYield: List[Yield] = Field(..., title="Yield", description="Quantitative and qualitative observations regarding the yield of harvest") 
+    soil: Soil = Field(..., title="Soil", description="A single soil profile for this planting, containing only one soil description")
+    yield_: Yield = Field(..., title="Yield", description="One set of quantitative and qualitative yield observations for this planting") 
 
 class FarmActivities(BaseModel):
     name: str = Field(..., title="Name", description="The name of the agricultural field.")