Impact assessment of drainage water management in salt affected soils of Godavari western delta on a pilot scale in India
2014
Vishnu, Vardhan Sidlagatta (Acharya N.G. Ranga Agricultural University, Andhra Pradesh (India). Faculty of Agricultural Engineering and Technology) | Sreenivas, Chilamkurthy (Acharya N.G. Ranga Agricultural University, Andhra Pradesh (India). Faculty of Agriculture) | Venkat, Reddy Chinta (Acharya N.G. Ranga Agricultural University, Andhra Pradesh (India). Faculty of Agriculture) | Sreedevi, Pandraju (Acharya N.G. Ranga Agricultural University, Andhra Pradesh (India). Faculty of Agricultural Engineering and Technology)
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 farmer's fields of Kalipatnam pilot area by installing a sub-surface drainage (SSD) system with a drainage coefficient of 1 mm-day-1 to control the increasing levels of soil salinity levels in Godavari Western Delta of India on 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.
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