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Agronomy Journal Abstract -

Photosynthetic Efficiency of Sorghum Genotypes After Head Emergence1


This article in AJ

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

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



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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