Effects of crop residue burning on soil physical and hydrological properties in semi-arid agricultural production systems
The effect of wheat-stubble burning on soil physical and hydrological properties is under scrutiny to develop a sound soil and water management planning in agroecosystems. The objective of this study was to compare completely-burned, moderately-burned, and unburned soil conditions for responses of soil physical and hydrological properties. The persistence of fire-induced impacts were studied in 3 hectare land for both burned and unburned conditions for two years. Results showed that saturated hydraulic conductivity significantly increased in descending order 0.81, 0.36, and 0.23 cm h-1 for burned, moderately burned, and unburned plots (P=0.000). Fire intensity significantly reduced the pore space volume, the highest for burned and the least for the moderately-burning treatments (P<0.001). Unburned treatments had 11.5 and 9.7 % more pore spaces than completely-burned and moderately-burned plots, respectively. Residue burning significantly changed pore size distributions between three levels of treatments (P<0.045). Completely burned treatments registered significantly higher Ksat (P=0.000) differences 0.89 and 0.79 cmh-1, respectively from unburned and moderately burned treatments. Residue burning significantly decreased storage pores from 37.3% (unburned) to 25.8% (burned), while significantly increasing residual pores from 8.07% to 13.5 % (burned) and 12.7% (moderately burned). To conclude, residue-retaining soil management practices need implemented in the Plain.
Amik Plain, burned soil, dead pore, hydraulic properties, residue burning