Impact Assessment of Drainage Water Management in Salt Affected Soils of Godavari Western Delta on a Pilot Scale in India
Procena uticaja upravljanja odvedenom vodom na slanim zemljištima na oglednom polju delte Zapadnog Godavari u Indiji
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Author
Vardhan, Sidlagatta
Sreenivas, Chilamkui
Reddy, Chinta
Sreedevi, Pandraju
Keywords
sub surface drainage systemdrainage effluent
drainage coefficient
salt load
internal rate of return
leaching
seawater intrusion
pod-površinski system drenaže
drenažni odliv
koeficijent drenaže
slain talog
interna rata
ispiranje
morska voda
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A.P. Water Management Project, Andhra Pradesh was planned with implementing various improved irrigation, drainage water management practices and is executed using object oriented project planning technique under financial assistance from FAO. Drainage is an effective tool in combating the negative effects of salinity and water logging. Five years of operational pilot research were conducted in fanner's fields of Kalipatnam pilot area by installing a sub-surface drainage (SSD) system with a drainage coefficient of 1 nun-day'1 to control the increasing levels of soil salinity levels in Godavari Western Delta of India 011 a pilot scale. There has been significant decrease in the soil salinity in the range of 33% in the pilot area through leaching of salts to the tune of 59 t-ha'1 from the system during 2005 - 2009. Productivity levels were increased by 15 - 25% in kharif season and 25 - 40% in rabi season. An economic analysis showed that SSD system is cost effective and benefit cost ratio was worked out be 3.3 with a payback period of 2.18 years with internal rate of return of 27.19%. Potential impact has been found significantly in soil quality, crop performance, improvement in family income, land value and gender issues were also addressed. A.P. projekat upravljanja vodom u Andhra Pradesh bio je planiran sa primenom različitih unapređenih postupaka navodnjavanja i drenaže vode i izveden je uz finansijsku pomoć FAO. Drenaža je efikasno sredstvo za borbu protiv negativnih efekata saliniteta i zadržavanja vode. Pet godina je operativno pilot istraživanje sprovođeno na parcelama farmera u oblasti Kalipatnam postavljanjem sistema pod-površinske drenaže sa koeficijentom drenaže od 1 mm na dan, radi kontrole rastućih vrednosti saliniteta zemljišta na oglednom polju u zapadnoj delti Godavari. Postignuto je značajno smanjenje saliniteta zemljišta od 33% na oglednom polju ispiranjem soli iz sistema sa 59 t•ha-1 tokom 2005 – 2009. Produktivnost je povećana za 15-25% u kharif sezoni i 25-40% u rabi sezoni. Ekonomska analiza je pokazala da je ovaj sistem drenaže i finansijski efikasan, a odnos prihoda i troškova je bio 3.3, sa periodom otplate od 2.18 godina i internom ratom od 27.19%. Značajan je bio i potencijalni uticaj na kvalitet zemljišta, osobine useva, unapređenje porodičnih prihoda i vrednost zemljišta.