Abstract
A medium-duration pigeonpea cultivar (ICP 1–6) and a hybrid sorghum (CSH 5) were grown on a shallow Alfisol in monocropping and intercropping systems. Using a monolith method, spatial distribution of nodulation, acetylene reduction activity (ARA) and root respiration were measured.
The number, mass and ARA of nodules decreased exponentially with distance from the plant base except at the late reproductive stage. Nodulation and ARA tended to be higher in the intercrop than in the monocrop.
Respiration rate of roots increased with distance from the plant base and reached a maximum value at about 20–30 cm. The rate was higher in pigeonpea than in sorghum and also higher in intercrop than in monocrop.
This study suggests that pigeonpea roots are physiologically more active than sorghum roots, implying that pigeonpea may become a strong competitor for nutrients in the soil when intercropped. The nitrogen-fixing ability of pigeonpea may be enhanced by intercropping because the sorghum rapidly absorbed inorganic N which would otherwise inhibit N2 fixation.
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References
Graham P H and Rosas J C 1980 J.Agric Sci.,Camb. 90,311–317
Hooda R S, Rao A S, Luthra Y P, Sheoran I S and Singh R 1986 J.Exp.Bot. 37,1492–1502
Ito O, Matsunaga R, Tobita S and Rao T P 1991 In Proceedings of the 3rd Symposium of the International Society of Root Research, 2–6 Sept. 1991, Vienna, Austria.
Nambiar P T C, Rao M R, Reddy M S, Floyd C N, Dart P J and Willey R W 1983 Expl.Agric. 19,79–86
Rao A S, Luthra Y P, Sheoran I S and Singh R 1984 J.Exp.Bot. 35,774–784
Wahua T A and Miller D A 1978 Agron. J. 70,292–295
Willey R W, Rao M R and Natarajan M 1981 In Proceedings of the International Workshop on Pigeonpeas. Volume 1. Eds Nene Y L and Kumble V. pp 11–25. ICRISAT, Patancheru, India
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Ito, O., Matsunaga, R., Tobita, S. et al. Spatial distribution of root activity and nitrogen fixation in sorghum/pigeonpea intercropping on an Indian Alfisol. Plant Soil 155, 341–344 (1993). https://doi.org/10.1007/BF00025052
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DOI: https://doi.org/10.1007/BF00025052