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This article in AJ

  1. Vol. 65 No. 6, p. 933-936
    Received: Apr 6, 1973

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Yield and Chemical Characteristics of Corn (Zea mays L.) Types1

  1. M. D. Jellum,
  2. D. G. Cummins and
  3. C. T. Young2



The severe southern corn leaf blight epiphytotic in 1970 caused by Race T of Helminthosporium maydis Nisikado and Miyake resulted in a seed shortage of adapted hybrids with disease resistance for planting in 1971. This shortage led to alternative choices for the use of seed of F2 generation of adapted hybrids, imported hybrids, cytoplasmic blend hybrids, and open-pollinated varieties. Fifteen tests were conducted throughout Georgia to determine grain yield, silage yield, and chemical characteristics of these corn (Zea mays L.) types. Adapted hybrids produced the highest grain yields followed by blends with a high proportion of resistant plants, and then by the F2 generation types. The imported hybrids and the open-pollinated variety were low in grain yields. Healthy plants in a mixed population of healthy and diseased plants did not yield more per plant than healthy plants in a pure stand. The rank of corn types for silage yields was similar to grain yields, but the differences were not as great. Dry matter digestibility of the grain did not differ among the corn types. The imported dent × flint hybrid and flint hybrids were higher in protein and oil than the other types. Fatty acid composition of oil was different among entries, but differences among corn types were not distinct. Growing conditions such as irrigation, planting dates, and locations had significant effects on certain chemical characters, but these effects were of little importance. These results should assist in better choices in the future, if a similar disease situation occurs.

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