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Pakistan Journal of Biological Sciences
Year: 2001  |  Volume: 4  |  Issue: 2  |  Page No.: 193 - 196

Spatial Variability of Soil Salinity/sodicity and its Effect on Maize Crop

Muhammad Shafiq, Iqbal Hassan, Shahid Ahmad and Zahid Hussain    

Abstract: It was observed that about 75 percent grid points showed gradual increasing trend in pH with depth. The difference in pH of 0-15 cm and 60-90 cm layers ranged from 0.04 to 1.36 units with an average value of 0.56 units. Soil salinity (EC) depicted mainly mixed trend. It was further observed that 18.3 percent area possesses pH greater than critical level (8.5) in surface layer. Proportions of problematic area increased in sub-surface layers. There was quite variation in yield and yield components. Patchy sodicity problem reduced productivity of the study site by about 15 percent.

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