Effects of environmental factors on the influence of tillage conversion on saturated soil hydraulic conductivity obtained with different methodologies: a global meta-analysis

Abstract. The saturated hydraulic conductivity (Ksat) is a key soil property governing agricultural production. However, the influence of conversion from conventional tillage (CT) to conservation (CS; including no tillage, NT, and reduced RT) on Ksat soils not well understood still debated. In this study, we applied global meta-analysis method synthesize 227 paired observations for 69 published studies investigated factors influencing effects CS Ksat. Results showed that layer, type, texture cropping system management did have significant When was measured by rainfall simulator, significantly (p<0.05) increased surface subsurface 41.7 % 36.9 %, respectively. addition, also tended increase under practices when tension disc infiltrometer. hood infiltrometer, ring constant/falling head, Guelph permeameter, had It observed that, period less than 15 years, greater longer period. Climatic topographic factors, mean annual temperature (MAT) precipitation (MAP), were statistically related responses at scale. Quadratic polynomials can describe relationships between them. These findings suggested quantifying needed consider experimental conditions, especially measurement technique