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Saturated hydraulic conductivity, dispersion index and water retention changes in SAS under different quality water irrigation

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Title Saturated hydraulic conductivity, dispersion index and water retention changes in SAS under different quality water irrigation
Not Available
 
Creator NK Arora
SK Chaudhari
Yadav RK
Sharma PC
 
Subject Alkali soil
Dispersion index
Matric suction, RSC
Saline soil
Salt affected soils
Saturated hydraulic conductivity
 
Description Not Available
Impact of different quality irrigation water viz., normal tap water (NTW, EC 0.7 dS m-1), dilute saline water
(DSW, EC 5.0 dS m-1; SAR 5.0 mmol½ L-½), concentrated saline water (CSW, EC 10.0 dS m-1; SAR 5.0 mmol½
L-½), dilute alkali water (DAW, RSC 2.5 me L-1) and concentrated alkali water (CAW, RSC 10.0 me L-1) was
evaluated on the physical properties of normal (pHs 7.5, ECe 1.0 dS m-1), saline (pHs 7.7, ECe 10.6 dS m-1) and
alkali (pHs 9.15, ECe 2.9 dS m-1) sandy loam soils in the micro-lysimeters during growth of wheat (cv. KRL
213) and rice (cv. CSR 36). Initial saturated hydraulic conductivity (Ks) for normal, saline and alkali soil was
0.16, 0.23 and 0.005 cm h-1, respectively. Ks was reduced significantly to one fifth of initial value under CAW
while DSW and CSW caused 20 and 50% increase, respectively as compared to normal soil. In alkali soil, Ks
decreased significantly i.e. > 50% under DAW from its initial value of 0.005 cm h-1 and reduced to about onefifth
(0.001), under CAW. While Ks increased significantly to 0.07 and 0.21 cm h-1 on the application of DSW
and CSW, respectively. In post wheat samples, Ks increased by 10 to 15-times in normal soil while, 5 to 9-times
in saline soil and 15 to 30-times in alkali soil under both DSW and CSW. But in comparison to post-rice soil, no
effect was observed in alkali soil in post-wheat soil on alkali water application but Ks increased 5 to 10-times in
normal and saline soil under saline water irrigations. Dispersion index (DI) and Ks found inversely proportional
to each other in all water treatments in all three soils. Under DAW (31.3) and CAW (39.9), DI was increased
significantly by 5 and 33%, respectively as compared to the initial soil. DI increased by 12 and 30% under dilute
and concentrated alkali water application, respectively in saline soil. DI increased significantly with application
of CAW (65.3) and decreased when irrigation was applied with DSW (37.0) and CSW (34.2), respectively.
Under different quality water irrigation, soil water retention was the highest in alkali soil followed by normal
and saline soils at all matric suctions. Under the application of saline water in all three soils, water retention
either decreased or remains unchanged with increase in TEC of irrigation water as compared to normal tap
water. Whereas under the application of alkali water, it increased in all the three soils with increase in TEC of
irrigation water as compared to normal tap water application,.
Not Available
 
Date 2019-11-25T11:40:31Z
2019-11-25T11:40:31Z
2019-01
 
Type Research Paper
 
Identifier Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/25376
 
Language English
 
Relation Not Available;
 
Publisher Journal of Soil Salinity and Water Quality