Mulch and Temperature Regulation

In our trial we are currently comparing leeks grown with and without organic mulch. Last week we measured the temperature of the soil surface on a sunny day. Leeks are more of a cool-season crop and thrive on soil temperatures between 10°C and 21°C. The insulating effect of the mulch layer kept the surface temperature as low as 23.5°C whereas the uncovered soil surface was as hot as 52.5°C. During hot summer weather, this insulation is really helpful as it enables a range of plant roots to utilise even the top few centimeters of soil which are generally the most fertile. Heat-stressed roots slow down their growth and nutrient uptake can be negatively affected. 🔍🌡️🔍