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  1. Vol. 16 No. 2, p. 304-305
     
    Received: Mar 25, 1975
    Published: Mar, 1976


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doi:10.2135/cropsci1976.0011183X001600020040x

Leaf Area Index and Grain Yield for NonProlific and Prolific Single Crosses of Maize1

  1. C. L. Prior and
  2. W. A. Russell2

Abstract

Abstract

Leaf area indexes (LAI) were obtained for seven elite, nonprolific and seven elite, prolific single crosses of maize (Zea maysL.) in six plant densities ranging from 20,500 to 72,000 plants/ha in one high yield environment. Differences in LAI among hybrids were highly significant, but there was no significant hybrids ✕ densities interaction. LAI increased linearly with increasing plant densities and was greater for the prolific hybrids than for the nonprolific hybrids at each density. Maximum yields for the two groups of hybrids were obtained at similar LAI's (4.0 and 4.1), which occurred at plant densities of 61,700 plants/ha for the nonprolific hybrids and 51,400 plants/ ha for the prolific hybrids. One prolific hybrid yielded most (120.0 quintals/ha) at 30,800 plants/ha where the LAI was 2.9. The linear responses of grain yield to increasing plant densities differed significantly (b1 = 1.18, prolific and b1 = 3.14, nonprolific) for these groups of hybrids. LAI appears unrelated to the differences in linear responses for yield.

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