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Simulating Root System Development of Short-duration Pigeonpea

Published online by Cambridge University Press:  03 October 2008

Gayatri Devi O. Ito ,
R. Matsunaga ,
S. Tobita ,
T. P. Rao ,
N. Vidyalakshmi  and
K. K. Lee
Gayatri Devi O. Ito
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
R. Matsunaga
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
S. Tobita
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
T. P. Rao
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
N. Vidyalakshmi
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
K. K. Lee
Affiliation:
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
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Summary

Length and weight of pigeonpea roots were measured weekly in different soil layers and compared with estimates obtained from a root simulation model using daily climatic data, soil physico-chemical properties and dry matter allocation to roots. Daily moisture content and temperature at different soil depths were well simulated using sub-routines from the CERES-Maize model. Daily allocation of dry matter to roots was calculated from logistic functions fitted to the growth data for shoots and roots. Although root length and weight tended to be underestimated by the model, regressions between measured and simulated root growth were highly significant so that the model could, with a few modifications, be used to predict root system development.

Type
Research Article
Information
Experimental Agriculture , Volume 32 , Issue 1 , January 1996 , pp. 67 - 78
Copyright
Copyright © Cambridge University Press 1996

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