Vol. 12, Issue 4 (2023)

Author(s):
Sahana, Veeresh H, Narayana Rao K, Bhat SN and Polisgowdar BS

Abstract:
A study was conducted to ensure the impact of subsurface drainage system on soil nutrients and crop yield in salt affected soils under the TBP command area, Karnataka. The results revealed that the analyses of soil samples from post SSD work have indicated a slight increase in soil OCcontent i.e., 5.40, 4.31, 2.81 and 2.01 g kg^-1, while noticeable decrease in available N, P₂O₅, K₂O and S content of post-drainage soil samples in all the depths when compared to corresponding pre-drainage soil depths i.e., 187.51, 171.39, 106.98, 80.41 kg ha^-1 for available N, 25.48, 22.08, 19.57, 16.77 kg ha^-1 for available P₂O₅, 365.51, 341.87, 292.86, 281.18 kg ha^-1 for available K₂O and 36.93, 35.05, 28.79, 23.83 mg kg^-1 for available S in 0-30, 30-60, 60-90 and 90-120 cm soil depths respectively. Similarly there was significant reduction of all the micronutrients in surface layer of post-drainage compared to corresponding pre-drainage soil samples i.e., 0.43, 0.48, 0.52, 0.54 mg kg^-1 for Zn, 0.43, 0.46, 0.50, 0.52 mg kg^-1 for Cu, 1.23, 1.32, 1.38, 1.43 mg kg^-1 for Fe and 3.03, 3.16, 3.35, 3.53 mg kg^-1 for Mn for 0-30, 30-60, 60-90 and 90-120 cm. The installation of SSD system resulted in improvement of paddy yield to 4.2 t ha^-1 compared to 3.7 t ha^-1 before the drainage works, thus there was increase in yield by 13.27 percent.