Irrigation Management Of Romaine Lettuce
In Histosols At Two Spatial Scales:
Water, Energy, Leaching And Yield Impacts
Author(s)
Y. Périard, J. Caron, S. Jutras, J. A. Lafond & A. Houlliot
Abstract
Lettuce is an important crop in Canada, mainly grown in South West Quebec
muck soils. Lettuce is sensitive to water stress during periods of high crop water
requirements, which result in important yields decrease mainly due to tip burn.
This physiological disorder can be controlled by adequate irrigation, which is
affected by spatial distribution patterns of water needs at different field scales.
Such patterns result from spatial variability of soil properties and water drainage,
and from evapotranspirative processes affecting local crop water needs at a given
time. This study aimed at evaluating irrigation management performances (water
and energy consumption, leaching and yield) for Romaine lettuce in a Histosol at
two spatial scales, local and global (0.5 and 7 ha). Three field experiments were
performed during summers 2010 and 2011 at two sites of 7 ha presenting a high
spatial variability in available water (AW). The set up was divided into three
zones equipped with wireless tensiometers. The critical irrigation threshold for
initiating irrigation was −30 kPa for a low (< 4mm) potential evapotranspirative
(ET) demand and −15 kPa for a higher ET (> 4 mm) [1]. Results indicated that
local irrigation management has resulted in marketable yield increase of 16.5 to
18.2% depending on years, but resulted in 21.2 to 23.6% more water (and
consequently energy) use with respect to global management. Higher frequency
Keywords
precision irrigation, available water, Romaine lettuce
Related Book
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