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Crop production and water-use. III. The development and validation of a water-use model for potatoes

Published online by Cambridge University Press:  27 March 2009

P. J. C. Hamer ,
M. K. V. Carr  and
E. Wright
P. J. C. Hamer
Affiliation:
Department of Water Management, Silsoe College, Cranfield University, Silsoe, Bedford MK45 4DT, UK
M. K. V. Carr
Affiliation:
Department of Water Management, Silsoe College, Cranfield University, Silsoe, Bedford MK45 4DT, UK
E. Wright
Affiliation:
Department of Water Management, Silsoe College, Cranfield University, Silsoe, Bedford MK45 4DT, UK
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Summary

As a prerequisite for developing crop-yield/water-use functions for potatoes using the results of historical irrigation experiments, it was necessary to develop a water-use model which could operate with a limited data set. The general form of this model has been reported by Wright et al. (1994), and its application to the sugarbeet crop by Hamer et al. (1994). In this paper the development and validation of the model for potatoes is described.

The canopy was modelled in terms of intercepted incoming solar radiation using functions based on thermal time and time. Four phases of growth were identified: emergence, expansion, plateau and senescence. An empirical drought factor was included to allow for the effects of water stress on canopy development during the expansion phase. Root development was described using a two-phase model: linear and maximum depth (both time dependent).

Independent data from various sources were then used to validate the model in terms of its capacity to predict crop canopy development, with and without drought stress, soil water extraction at different depths and soil water deficits during the season. The study confirmed the validity of the model for predicting the water-use of potatoes.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 123 , Issue 3 , December 1994 , pp. 299 - 311
Copyright
Copyright © Cambridge University Press 1994

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