--subdivision Biotechnology under individual plants and groups of plants, e.g. Corn--Biotechnology
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Crop circle formations -- See Crop circles Here are entered works on inexplicable, flattened patterns in fields or crops. Works on patterns or variations in crop growth that are the result of buried archaeological sites or components of such sites are entered under Cropmarks.
Crop field circles -- See Crop circles Here are entered works on inexplicable, flattened patterns in fields or crops. Works on patterns or variations in crop growth that are the result of buried archaeological sites or components of such sites are entered under Cropmarks.
--subdivision Diseases and pests under individual plants and groups of plants, e.g. Corn--Diseases and pests
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Crop plants -- See Crops Here are entered works on plants grown for commercial use. --headings beginning with the word Crop; and individual crops and groups of crops, e.g. Corn; Food crops
Cropfield circles -- See Crop circles Here are entered works on inexplicable, flattened patterns in fields or crops. Works on patterns or variations in crop growth that are the result of buried archaeological sites or components of such sites are entered under Cropmarks.
--subdivision Control under individual weeds and groups of weeds, e.g. Prickly pears--Control; Aquatic weeds--Control; and subdivision Weed control under individual crops and groups of crops, e.g. Corn--Weed control