National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The introduction of irrigated agriculture in the arid and semi-arid regions of India has resulted in the development of twin problems of waterlogging and salinity. The problems also occurred in the valley bottoms of the Tungabhadra Irrigation Project (TBP). The subsurface drainage system was installed at 40, 50 and 60 m drain spacing to reclaim the salt affected soils in an area of 50 ha in the farmers’ fields at Mallapur village, Sidhanur taluk, Karnataka. The monitoring and evaluation of subsurface drainage system revealed that, soil reactions (pH), soil salinity (ECe) of the soil were decreased and it has been observed that 40 m drain spacing found better in improving the soil properties and then followed by 50 and 60 m drain spacing. The monthly average drain discharge was found to be maximum in 40 m spacing followed by 50 and 60 m drain spacing during kharif 2014 and rabi 2014-15 seasons, thus drain discharge was inversely proportional to the spacing. The total quantum of salt disposed along the drain discharge during kharif 2014 and rabi-2014-15 was maximum in 40 m spacing (35.92 t ha-1), followed by 50 m (23.53 t ha-1) and 60 m (17.23 t ha-1) drain spacing respectively. The total quantity of nitrogen loss (NO3-N) during kharif 2014 and rabi 2014-15 was maximum in 40 m spacing (43.09 kg ha-1), followed by 50 m (32.88 kg ha-1) and 60 m (26 kg ha-1) drain spacing respectively. Crop yield was increased to the extent of 60.2, 50.4 and 40.8 per cent in 40, 50 and 60 m drain spacing respectively and cropping intensity was increased from 147 to 171 per cent after the installation of drainage system.
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