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This article in AJ

  1. Vol. 65 No. 3, p. 459-461
     
    Received: July 31, 1972


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doi:10.2134/agronj1973.00021962006500030031x

Leaf Area Index and Radiation as Related to Corn Yield1

  1. C. E. Scarsbrook and
  2. B. D. Doss2

Abstract

Abstract

Two corn (Zea mays L.) hybrids were grown in 1969 and 1970 under irrigation at populations of 20,000, 40,000, and 80,000 plants/ha and at 51 and 102 cm row widths.

The purpose of the research was to determine the relationship of radiation and partial leaf area indices (LAI's) to corn yields. Radiation in the 350 to 450 nm range was measured at 0, 60, 120, and 180 cm above ground during four 3-day radiation periods. LAI measurements were made once each year during the grain filling stage of growth. The coefficient of determination (R2 = .64) between grain yield and LAI of the 120- to 180-cm segment was the highest of any 60 cm segment and was equal to the coefficient of determination between grain and the total LAI. The coefficient (R2 = .64) between stover yield and the 120 to 180 cm LAI was higher than that between stover yield and the total LAI (R2 = .56).

There was a satisfactory fit of the data to a linear regression of grain yield on radiation measured either at 0 or 60 cm above ground. From 61 to 74% of the variation in grain yield was predicted by radiation measured at 0 or 60 cm heights.

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