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- Alfalfa 42
- Croplands 27
- Seeds 5
- Sweet clover 4
- Bees 3
- Potatoes 3
- Ryegrasses 3
- Universities and colleges--Employees 3
- Weeds 3
- Alsike clover 2
- Clover 2
- Habitat (Ecology) 2
- Herbicides 2
- Red clover 2
- Agricultural exhibitions 1
- Agronomic Crop Science 1
- Barns 1
- Economic impact analysis 1
- Farms 1
- Flood damage 1