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Photosynthetic Efficiency of Sorghum Genotypes After Head Emergence 1
Author(s) -
Krishnamurthy K.,
Rajashekara B. G.,
Jagannath M. K.,
Gowda A. Bomme,
Raghunatha G.,
Venugopal N.
Publication year - 1973
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1973.00021962006500060003x
Subject(s) - sorghum , photosynthesis , agronomy , nitrogen , grain yield , dry matter , biology , population , sorghum bicolor , field experiment , yield (engineering) , leaf area index , sweet sorghum , botany , chemistry , demography , materials science , organic chemistry , sociology , metallurgy
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.