5 Cropping Systems - Crop Sciences Department

Cropping Systems 49 Thousand acresYear2010195019601970198019902000020 00600010000400080001200014000 CornSoybeanWheatOatsHayTwo crops corn and soybeans have come to domi-nate the cultivated area of Illinois over the past 60 years, moving from 60% of cropped acres in 1950 to more than 90% in recent years (Figure ). Wheat acreage de-clined by about half during this period, to about 1 million acres, while the number of acres used to produce livestock feed oats and hay has declined by almost 90%, down to less than 750 thousand acres. These shifts were due largely to the reduction in livestock numbers in Illinois. Much of the corn and soybeans produced in Illinois is exported to other states and to other acreage reached current levels during the 1970s, and though corn acreage has remained slightly higher than soybean acreage, most fields in Illinois have been managed as a 2-year corn soybean rotation.

one plant species that inhibits the growth of another species. It has been proven or is suspected to cause yield reductions when one crop follows another of the same family—for example, when corn follows wheat. Techni-cally, damage to a crop from following itself (such as corn following corn) is referred to as autotoxicity. In

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  Species, Plants, Cropping, Plant species

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