Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2004 , Volume 18 , Number 2; Page(s) 0 To 0.
 
Paper: 

EFFECT OF SALINE IRRIGATION WATER ON SUNFLOWER YIELD

 
 
Author(s):  FEIZI M.
 
* 
 
Abstract: 

In arid and semiarid regions of Iran most of the irrigation waters are saline. These waters are used to grow strategic crops such as wheat and barley with acceptable yields. Because of the necessities of using saline water in agriculture, research on plant tolerance to salinity has great importance. In this study, five saline irrigation water treatments were used on sunflower (Zarya cultivar) in three replicates in RCBD. Three saline water application treatments were 2.6, 6.1 and 10.5 dS/m (S1, S2 and S3) during all the season and two saline water application treatments irrigated with 2.6 dS/m water in early season (germination and establishment stages) and, for the rest of growth period, saline water of 6.1 (S4) or 10.5 dS/m (S5). The result shows that seed relative yield (Ry) in S2 and S3 were about 62 and 20 percent, respectively, compared with S1 treatment. Ry of S4 and S5 were 66.6 and 48 percent, respectively. To estimate the Ry, the best correlation was obtained with weighted average of irrigation water salinity (ECiw) in the season and was calculated from this equation (Ry=130-9.85 (ECiw)) with R2=0.67. According to the results, application of good water quality (ECiw=2.6 dS/m) (in rates of 20-25 percent of crop water consumption) during the germination and crop establishment and using water salinity of 10.5 dS/m for the rest of season had 28.4 percent yield increase compared to 10.5 dS/m (S3) in all the season. Mean electrical conductivity of soil saturation extract (ECe) during growth period and for the 40 cm soil depth were 8, 12.5, 19.4, 11.6 and 14.8 dS/m in S1 to S5, respectively. Also sodium absorption ratio (SAR) in the above mentioned treatments were 12.4, 21, 27, 20 and 25, respectively.

 
Keyword(s): RELATIVE YIELD, SALINE WATER, SALINITY TOLERANCE, SUNFLOWER
 
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