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This article in AJ

  1. Vol. 65 No. 6, p. 858-860
     
    Received: July 5, 1972
    Published: Nov, 1973


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doi:10.2134/agronj1973.00021962006500060003x

Photosynthetic Efficiency of Sorghum Genotypes After Head Emergence1

  1. K. Krishnamurthy,
  2. B. G. Rajashekara,
  3. M. K. Jagannath,
  4. A. Bomme Gowda,
  5. G. Raghunatha and
  6. N. Venugopal2

Abstract

Abstract

The three growth parameters measured after heademergence, net assimilation rate (NAR) based on total dry matter and leaf area/plant, leaf area duration (D), and grain-leaf ratio (G), were studied in several field experiments on sorghum [Sorghum bicolor (L.) Moench] to evaluate their relationship to yield. Each growth component was correlated with grain yield. Both D and G were found to vary with genotype, as well as with changes in plant population and levels of nitrogen. Grain-leaf ratio was found to be greater in a new cross, MS 2219 × IS 3541, than in hybrid CSH-1. ‘Swarna,’ a genotype with erect leaves, was found to have higher G than CSH-1. Increasing the plant population from 133,000 to 177,000 plants/ha increased D, but reduced G. Increasing the levels of nitrogen from 60 to 120 and 180 kg/ha increased only D. Both G and D were correlated with grain yield. Nevertheless, the high multiple correlation of yield with G and NAR stressed the importance of NAR.

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