Use of brackish water for the reclamation of dense saline-sodic soils by auger hole technology and economic growth of wheat crop.

摘要

Currently, availability of good-quality water is falling short of the crop requirement, particularly in arid and semi-arid regions of Pakistan. A field experiment was conducted on dense saline-sodic soils at Tehsil Toba Tek Singh at three sites. The initial EC_e, SAR and pH_s of the soils ranged from 9.86 to 25.30 dS m-1, 17.1 to 46.7 and 7.57 to 7.98, respectively at 0-15 cm depth. The treatments were: T₁=Tube well water (TW) alone, T₂=TW-Canal water (CW), T₃=TW-CW+one auger hole per 30 m2 refilled with gypsum and rice husk, T₄=TW-CW+one auger hole per 60 m2 refilled with gypsum and rice husk. Overall T₃ was best in decreasing EC_e, SAR and pH_s at all three sites. Maximum decrease (%) in EC_e, SAR and pH_s was 70.23 (T₃) at site 1, 69.67 (T₄) at site 2, and 4.64 (T₁) at site 1, respectively at 0-15 cm depth. Maximum wheat grain yield (4180, 3805 and 4259 kg ha-1 at sites 1, 2 and 3, respectively) were recorded with T₃. Maximum benefit cost ratio was 3.47, 3.38 and 2.95 with TW-CW+one auger hole per 30 m2 refilled with gypsum and rice husk (1:1 ratio by volume) at sites 3, 1 and 2, respectively.