Physiological response of wheat (Triticum aestivum L.) cultivar INCA TH 4 to water deficit
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Abstract
Agricultural Sciences (INCA) an experiment was conducted
with crop wheat in order to assess their physiological
response to water stress by default, for which the effect of two
irrigation treatments on soil moisturecontent, development
variables, water relations, yield and water use efficiency
(WUE) in culturewere evaluated. The INCA TH 4 cultivar
was grown at double row in concrete containers of 1,56 m 2.
The two irrigation treatments T 100 and T 50, they consisted
of applying 50 to 100 % of standard crop evapotranspiration
(ETc.), respectively.Background fertilization was performed
before planting with complete formula NPK (9-13-17) and
urea (46-0-0) applied to each container 0,1 and 0,04 kg.,
respectively. Irrigation was applied using an automated
system micro sprinkler and water delivery was controlled
by valves placed in each treatment. The results showed a
significant effect of treatments on soil water content and
T 50 at 52 and 67 days after sowing (DDS) that dropped
below 15 %, something that was confirmed with the values
of potential deficit soil moisture (Dp) which was 178 in T
50 and 77 mm in T 100, respectively. Also the results of
leaf water potential (Yfoliar) showed that T 50 plants were
exposed to severe water deficit at 41 and 62 DDS, with
lower values of -1.5 MPa and T 100 at 62 DDS. Stomatal
conductance (gs) showed greater sensitivity to water stress
than the remaining variables of water relations. Studied
treatments hardly exerted any effect on growth variables,
mainly in the accumulation of dry matter and leaf area. In T
50 plants had a lower yield and water use efficiency (WUE)
was slightly higher than the T 100.
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