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Effect of saline water irrigation on salt dynamics and productivity of maize (Zea mays) in a heavy textured coastal saline soil

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Title Effect of saline water irrigation on salt dynamics and productivity of maize (Zea mays) in a heavy textured coastal saline soil
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Creator T.D. Lama
D. Burman
S.K. Sarangi
K.K. Mahanta
B. Maji
 
Subject Coastal saline soil, maize, productivity, saline water irrigation, salt dynamics
 
Description Not Available
Water is becoming an increasingly scarce commodity with its availability declining day by day thereby posing a major challenge for its sustainable use. Water quality is yet another important issue as it influences the salinity build up that could impact crop productivity. Scarcity of good quality irrigation water is one of the major bottlenecks along with soil salinity that severely limits crop production in the coastal region of West Bengal, particularly during the dry season. Most of the lands are therefore mono-cropped and left fallow during the dry season. Thus there is a need to focus on proper irrigation management practices that would allow efficient use of available water resources to sustain crop productivity and increase cropping intensity in the region. A study was therefore were carried out at ICAR-Central Soil Salinity Research Institute, RRS, Canning Town, West Bengal to understand the impacts of saline water irrigation on salt dynamics and productivity of rabi maize in a heavy texture coastal saline soil. The treatments consisted of good quality irrigation water (ECiw < 2 dS m-1) and saline irrigation waters having ECiw of 4 and 8 dS m-1 applied in four different regimes based at 125, 100, 75 and 50 % of cumulative pan evaporation (CPE). The results obtained revealed that salinity build up at the end of the crop growth period was more with the application of saline irrigation water. With the application of irrigation water having salinity of 8.0 dS m-1, the mean surface soil salinity (ECe) increased from 4.17 dS m-1 to 7.1 dS m-1 at harvest. The soil ECe at harvest was 4.1 dS m-1 where good quality water was applied and 4.7 dSm-1 with irrigation water having ECe of 4.0 dS m-1. Soil ECe at harvest showed an increasing trend with the application of decreasing level of good quality water. However, with application of saline water in increasing amounts, the ECe increased due to introduction of more salts into the soil along with the irrigation water. This effect was more pronounced with application of irrigation water having EC 8.0 dS m-1 due to high salt content. The contents of Na+, K+, Cl- and SO4-2 in the soil saturation extract was found to be closely related to the soil ECe with R2 values of 0.84, 0.54, 0.87 and 0.65, respectively. The mean kernel and stover yields of maize were reduced by 24.2 and 18.5 % respectively in deficit irrigation treatment (50% CPE) as compared to irrigation level of 100% CPE. Statistically at par kernel and stover yields were obtained at irrigation levels of 100% and 75% CPE. Irrigation with saline water having EC of 8.0 dSm-1 significantly reduced the kernel, stover and cob yields of maize to the extent of 31.1, 46.4 and 26.2 % over that with good quality water. However, the differences in kernel yield of maize irrigated with good water to that with saline water of 4.0 dS m-1 was insignificant. The study revealed that irrigation with fresh water provides higher yield advantage in maize. However, under conditions of limited availability of irrigation water, irrigation with 4 dSm-1 saline water or deficit irrigation at 75% CPE may prove to be an alternative irrigation management option for maize production in coastal saline soil.
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Date 2019-10-15T07:05:58Z
2019-10-15T07:05:58Z
2019-02-07
 
Type Other
 
Identifier 36. Lama, T.D., Burman, D., Sarangi, S.K. Mahanta, K.K. and Maji, B. 2019. Effect of saline water irrigation on salt dynamics and productivity of maize (Zea mays) in a heavy textured coastal saline soil. In: Abstracts ICAR-CSSRI Golden Jubilee International Salinity Conference - Resilient Agriculture in Saline Environments under Changing Climate: Challenges & Opportunities, 7th – 9th February, 2019, ICAR-CSSRI, Karnal, Haryana.
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http://krishi.icar.gov.in/jspui/handle/123456789/23398
 
Language English
 
Relation Not Available;
 
Publisher Indian Society of Soil Salinity and Water Quality