Varietal differences in root growth as related to nitrogen uptake by sorghum plants in low-nitrogen environment

Nakamura, T and Adu-Gyamfi, J J and Yamamoto, A and Ishikawa, S and Nakano, H and Ito, O (2002) Varietal differences in root growth as related to nitrogen uptake by sorghum plants in low-nitrogen environment. Plant and Soil, 245 (1). pp. 17-24.

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Abstract

Hybrid (Sorghum bicolor (L.) Moench cv. CSH 9) and local variety (S. bicolor cv. FSRP) of sorghum were grown in an Alfisol field and in pots of Alfisol in semi-arid tropical India, and the productivity of sorghum in low N condition was studied in relation to N absorption by plant. The grain yield of the hybrid (CSH 9) was higher than that of the local variety (FSRP) irrespective of the rate of N application. The reduction in hybrid grain yield was less than that for the local variety when N was not applied. After booting stage hybrid absorbed more N than the local variety. To estimate the role of roots in N absorption, the characteristics of N absorption were parameterized. Relative growth rate was highly correlated with relative N absorption rate in plant. N absorption was regulated by root activity (specific N absorption rate per unit root mass and length). Specific N absorption rate in roots at physiological maturity was higher in the hybrid than in local variety in low N conditions. Therefore, the smaller reduction of hybrid yield in low-N conditions was ascribed to high-N absorption rate in its roots, and the high ability of roots to absorb N after booting stage.

Item Type: Article
Divisions: UNSPECIFIED
CRP: UNSPECIFIED
Subjects: Mandate crops > Sorghum
Depositing User: Library ICRISAT
Date Deposited: 19 Sep 2011 03:38
Last Modified: 14 Sep 2013 10:20
URI: http://oar.icrisat.org/id/eprint/1586
Official URL: http://dx.doi.org/10.1023/A:1020690501576
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: UNSPECIFIED
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