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Regional estimation of water deficit and potato yield in Quebec
Authors: M.H. Mahdian and J. Gallichand
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Download file: https://library.csbe-scgab.ca/docs/journal/39/39_3_165_ocr.pdf
Published in: CBE Journal » CBE Journal Volume 39 (1997)
Download RAW file: https://library.csbe-scgab.ca/docs/journal/39/39_3_165_raw.pdf
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Description: A lack of water during the growing season can cause sufficient stress to prevent normal physiological development of potatoes. In Quebec, water stress is a cause of reduction in potato yield. This study was conducted to estimate the spatial variability of simulated potato water deficit and yield increase resulting from irrigation on soil ranging from coarse to medium texture using the SUBSTOR crop growth model. Irrigation set point was fixed to 30% of the available water. Methods of triangulation, thin plate smoothing splines, kriging and inverse distance were evaluated for interpolation accuracy. Seasonal water deficit and percent yield increase were determined at three exceedance probability levels. Results of the simulation showed that regional water deficits were 245, 203, and 159 mm at the 10, 20, and 50% exceedance probability levels, respectively. For potato yield, simulated regional yield increases were 142, 73, and 25% at corresponding probability levels. Under Quebec climatic conditions, coarse soils will benefit more from irrigation than medium textured soils. With irrigation, simulated average yield increases were 31.5% for sandy soils and 22.0% for loamy soils. The interpolation method of thin plate smoothing splines, with elevation as the covariable, was the most accurate for seasonal water deficit and had a mean absolute error of 19.6 mm. For yield increase, the inverse distance was the best estimation method and had a mean absolute error of 35.8%. Keywords: modeling, interpolation, irrigation, potato, yield.
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Citation: M.H. Mahdian and J. Gallichand 1997. REGIONAL ESTIMATION OF WATER DEFICIT AND POTATO YIELD IN QUEBEC. Canadian Agricultural Engineering 39(3):165-175.
Volume: 39
Issue: 3
Pages -
Contributor:
Date: 1997
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Type: Text.Article
Format: PDF
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Coverage: Canada
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
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DOI:
Description: A lack of water during the growing season can cause sufficient stress to prevent normal physiological development of potatoes. In Quebec, water stress is a cause of reduction in potato yield. This study was conducted to estimate the spatial variability of simulated potato water deficit and yield increase resulting from irrigation on soil ranging from coarse to medium texture using the SUBSTOR crop growth model. Irrigation set point was fixed to 30% of the available water. Methods of triangulation, thin plate smoothing splines, kriging and inverse distance were evaluated for interpolation accuracy. Seasonal water deficit and percent yield increase were determined at three exceedance probability levels. Results of the simulation showed that regional water deficits were 245, 203, and 159 mm at the 10, 20, and 50% exceedance probability levels, respectively. For potato yield, simulated regional yield increases were 142, 73, and 25% at corresponding probability levels. Under Quebec climatic conditions, coarse soils will benefit more from irrigation than medium textured soils. With irrigation, simulated average yield increases were 31.5% for sandy soils and 22.0% for loamy soils. The interpolation method of thin plate smoothing splines, with elevation as the covariable, was the most accurate for seasonal water deficit and had a mean absolute error of 19.6 mm. For yield increase, the inverse distance was the best estimation method and had a mean absolute error of 35.8%. Keywords: modeling, interpolation, irrigation, potato, yield.
Keywords:
Résumé:
Mots-clés:
Citation: M.H. Mahdian and J. Gallichand 1997. REGIONAL ESTIMATION OF WATER DEFICIT AND POTATO YIELD IN QUEBEC. Canadian Agricultural Engineering 39(3):165-175.
Volume: 39
Issue: 3
Pages -
Contributor:
Date: 1997
Technical field:
Conference name:
Session name:
Other information:
Type: Text.Article
Format: PDF
Publication type:
Source:
Relation:
Coverage: Canada
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
Notes:
Other files:
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