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Near-saturated soil hydraulic conductivity and pore characteristics as influenced by conventional and conservation tillage practices in North-West Himalayan region,India

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International Soil and Water Conservation Research 2021年第2期9卷 249-259页

作者： Deepak Singh Alok Kumar Mishra Sridhar Patra Sankar Mariappan Nisha Singh ICAR-Indian Institute of Soil and Water Conservation Dehradun248195UttarakhandIndia Sam Higginbottom University of Agriculture Technology and SciencesPrayagraj211007U.PIndia Hemvati Nandan Bahuguna Garhwal University(A Central University) Srinagar(Garhwal)246174UttarakhandIndia

Tillage plays an important role in modifying soil hydraulic *** objective of the present study was to evaluate the effect of conservation tillage practices in a maize-wheat cropping system on nearsaturated soil hydraulic properties and pore characteristics in the North-West Himalayan region,*** treatments *** tillage(CT),minimum tillage(MT),and zero tillage(ZT)were evaluated in terms of field saturated hydraulic conductivity(ks),unsaturated hydraulic conductivity k(h),the inverse of capillary length(a),flow-weighted mean pore radius(r0),numbers of pores per square meter(n0)and water-conducting macroporosity(Ɛ).The above hydraulic conductivity and pore characteristics were derived from steady-state water flux(q)measured using hood infiltrometer at 0,1,and3 cm pressure head for each treatment after seven years of establishment of this tillage *** revealed significantly(pflow under ZT and MT as compared with *** of r0 values indicated better connectivity of pores in ZT and MT as compared with *** flow suggested that on average pore radii,>0.50 mm conducted about 63.60,68.01,and 75.97%of total flow(at 0 cm pressure head)in the corresponding water-conducting macroporosity of 0.00030,0.00044,and 0.00069%of soil volume under CT,MT,and ZT,***,zero-tillage based agriculture system was found to improve near-saturated soil hydraulic properties.

关键词： Near-saturated hydraulic conductivity Macropores Tillage flow weighted mean pore radius Water-conducting macroporosity

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