Effect of different rotation patterns on soil microbial population and physiochemical properties under gravel-sand mulched field conditions Influence of karst mountain under-forest economy modes on soil infiltration in Southwest China Effects of rotational tillage on soil physiochemical propertiesand spring maize yield in Weibei Highlands Biochar research advances regarding soil improvement and crop response Influences of application of biochar and biochar-based fertilizer on brown soil physiochemical properties and peanut yields