475mmin a deficit irrigation, where no deep percolation occurred
(Ertek et al., 2004). There was also a variance in seasonal plant water
consumption or evapotranspiration of irrigation treatments from
336 to 539mm in Van (Turkey). For a full irrigation, the seasonal
irrigation quantities applied during spring and fall growing seasons
were 312 and 251mm, respectively, under trickle irrigation,
and 373 and 284mm under furrow irrigation (Amer, 2011). In the
same study, the water applied for squash in the fall growing season
was 27.8% less in comparison with those grown in the spring
season, while the reduction due to the irrigation system was less
evident, where the water applied for squash with trickle irrigation
was reduced to 16.4% compared with the furrow irrigation system.
Irrigation compensation (Irc) varied from 17% to 84% in 2013
and from 20% to 80% in 2014. Irc was generally higher in treatments
irrigated with a high amount of water than those irrigated
with a low amount of water. Scarce precipitation was obvious especially
during the middle months of the growth season, namely
from July to August in both years, when plant growth and water
demand typically peak (Fig. 2). Therefore, a large proportion of crop
water requirement was compensated by irrigation water because
of low rainfall during the growing season in both the years. Irc values
of treatments irrigated at the 7-day interval were higher than
those irrigated at the 14- and 21-day intervals (Table 4), because
frequently watered plants used more water. The frequent irrigations
prevent the large fluctuation in plant water stress caused by
infrequent irrigations (Radin et al., 1989). In a case, precipitation
provided 53% (232.8mm) of the estimated total water requirements
for pumpkin (Fandika, 2012).
475mmin a deficit irrigation, where no deep percolation occurred(Ertek et al., 2004). There was also a variance in seasonal plant waterconsumption or evapotranspiration of irrigation treatments from336 to 539mm in Van (Turkey). For a full irrigation, the seasonalirrigation quantities applied during spring and fall growing seasonswere 312 and 251mm, respectively, under trickle irrigation,and 373 and 284mm under furrow irrigation (Amer, 2011). In thesame study, the water applied for squash in the fall growing seasonwas 27.8% less in comparison with those grown in the springseason, while the reduction due to the irrigation system was lessevident, where the water applied for squash with trickle irrigationwas reduced to 16.4% compared with the furrow irrigation system.Irrigation compensation (Irc) varied from 17% to 84% in 2013and from 20% to 80% in 2014. Irc was generally higher in treatmentsirrigated with a high amount of water than those irrigatedwith a low amount of water. Scarce precipitation was obvious especiallyduring the middle months of the growth season, namelyfrom July to August in both years, when plant growth and waterdemand typically peak (Fig. 2). Therefore, a large proportion of cropwater requirement was compensated by irrigation water becauseof low rainfall during the growing season in both the years. Irc valuesof treatments irrigated at the 7-day interval were higher thanthose irrigated at the 14- and 21-day intervals (Table 4), because
frequently watered plants used more water. The frequent irrigations
prevent the large fluctuation in plant water stress caused by
infrequent irrigations (Radin et al., 1989). In a case, precipitation
provided 53% (232.8mm) of the estimated total water requirements
for pumpkin (Fandika, 2012).
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