DEPARTMENT OF AGRICULTURAL ENGINEERING AHMADU BELLO UNIVERSITY ZARIA: A TIME-BASED STRESS-DAY INDEX CONCEPT FOR IRRIGATION SCHEDULING
DEPARTMENT OF AGRICULTURAL ENGINEERING AHMADU BELLO UNIVERSITY ZARIA: A TIME-BASED STRESS-DAY INDEX CONCEPT FOR IRRIGATION SCHEDULING
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Date
1992-11
Authors
BUNGWON, Z. D.
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Abstract
A time-based concept which provides a quantitative
means for estimating the plant water stress imposed on
a crop during its growing season to provide a criterion
for characterising the need for irrigation is
presented, based on the stress -Day Index (SDI)
concept. Wheat (Triticum aestivum L.) was used as the
experimental crop, at the Ahmadu Bello University Farm
during the 1991/92 irrigation season.
The Time-based concept was evaluated by comparing;
(1) estimates of plant-based plant water deficits
corresponding to specified time intervals at different
crop growth stages; (2) the values of water used
efficiencies from the time-based concept for irrigation
scheduling with results obtained from a conventional
irrigation scheduling approach; and (3) Estimating the
Correlation Coefficient between seasonal crop water
stress and grain yield from the time-based concept.
The results indicated that the time-based form of
characterising plant water deficit is less effective
with regards to the definition of crop susceptibilities
to water deficits as a function of the timing of
occurance of the deficit. However, using the time-based
concept for irrigation scheduling, an increase of 20.5
per cent in water use efficincy was obtained over that
of the conventional approach to irrigation scheduling.
Description
Being a thesis submitted to the Postgraduate School,
Ahmadu Bello University, in partial fulfillment of the
requirements for the award of M.Sc Degree in
Agricultural Engineering.
November, 1993
Keywords
DEPARTMENT,, AGRICULTURAL,, ENGINEERING,, AHMADU BELLO UNIVERSITY ZARIA