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Soybean
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24
Corn
4
Agronomy
3
Agricultural extension work
2
Crop yields
2
Plant diseases
2
Agricultural productivity
1
Corn -- Yields
1
Cotton
1
Farmers
1
Field crops
1
Meat substitutes
1
Nematodes
1
Peanuts
1
Soy proteins
1
Soybean -- Yields
1
Soybean meal
1
Soybean products
1
Tobacco
1
Wheat
1
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