Effect of seasonal water stress imposed on drip irrigated second crop watermelon grown in semi-arid climatic conditions |
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Authors: | Halil Kirnak Ergun Dogan |
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Institution: | (1) Agriculture Faculty, Irrigation Department, University of Harran, 63200 Sanliurfa, Turkey |
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Abstract: | A study was conducted to determine the water stress effect on yield and some physiological parameters including crop water
stress index for drip irrigated second crop watermelon. Irrigations were scheduled based on replenishment of 100, 75, 50,
25, and 0% soil water depletion from 90 cm soil depth with 3-day irrigation interval. Seasonal crop evapotranspiration (ET)
for I100, I75, I50, I25, and I0 were 660, 525, 396, 210, and 70 mm in 2003 and 677, 529, 405, 221, and 75 mm in 2004. Fruit yield was significantly lowered
by irrigation water stress. Average water-yield response factor for both of the years was 1.14. The highest yield was obtained
from full irrigated treatment as 34.5 and 38.2 t ha−1 in 2003 and 2004, respectively. Lower ET rates and irrigation amounts in water stress treatments resulted in reductions in
all measured parameters, except water-soluble dry matter concentrations (SDM). Canopy dry weights, leaf relative water content,
and total leaf chlorophyll content were significantly lowered by water stress. Yield and seasonal ET were linearly correlated
with mean CWSI values. An average threshold CWSI value of 0.17 before irrigation produced the maximum yield and it could be
used to initiate the irrigation for watermelon. |
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