Mulching may be defined as the process of covering the soil surface around the plants to create congenial conditions for the crop growth. This may include moisture and soil conservation, temperature moderation, salinity and weed control etc. It exerts a decisive affect on earliness, yield and quality of the crop. The different mulch materials have the affect of modifying heat exchange between the covered and atmospheric environment. The temperature difference is the resultant effect between the accumulation and loss of energy..
Accumulation of energy:Shortwave radiation (Incoming ) Generates heat: 380-780 nm - Most effective 500 nm Some contribution by 280-380 UV and 780-2500 l.R. also.