Modelling Irrigation Strategies To Minimize
Deep Drainage For Two Different Climatic
Regions Of Canada
Author(s)
G. Parkin & S. Wang
Abstract
Irrigation is a vital part of agriculture in certain regions of Canada including the
interior of British Columbia. In this study we examined the use of a soil water
budget model for efficient irrigation management in two contrasting climatic
regions of British Columbia: Abbotsford (AD) and Osoyoos (OS). The average
annual precipitation at AD and OS are 1573 and 318 mm, respectively. The soil
types (AD – silt loam and OS – sand) and major crops (AD – raspberry and OS –
apple) are also quite different between the two regions. We used the
Simultaneous Heat and Water (SHAW) model to estimate the amount of deep
drainage and soil water content under different irrigation management strategies.
The SHAW model integrates detailed physics of vegetative cover, snow, residue
and soil into one simultaneous solution. The model was run on a daily basis for
28 and 32 years for AD and OS regions, respectively. Different combinations of
crop and irrigation conditions were run for each region. Based on this study, the
\“best” irrigation management strategy involves triggering every irrigation event
when the soil water content (estimated by SHAW) in crop’s rooting zone reaches
a prescribed amount below field capacity. At that time, 40 mm of irrigation is
added as rainfall. Other strategies involved adding more irrigation and a
constant weekly irrigation regardless of rainfall and soil water content. In
conclusion, while most of deep drainage in the dormant seasons (no irrigation)
cannot be controlled, it can be well controlled to a minimum level in the growing
seasons by \“best” irrigation management practice.
Keywords: irrigation modelling, minimize drainage, Canadian conditions.
Keywords
irrigation modelling, minimize drainage, Canadian conditions.
Related Book
Other papers in this volume
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