root length density declined with increasing depth from the soil surface for both genotypes (Endurance and Resolution) at the two sites; in fact the majority of fine roots were concentrated in the first 0e10 cm of soil
root length density declined with increasing depth from the soilsurface for both genotypes (Endurance and Resolution) at thetwo sites; in fact the majority of fine roots were concentratedin the first 0e10 cm of soil