Shear characteristics on soil specimen including roots of 10 types of herbaceous plants.

Abstract

Direct shear tests were made on soil specimen including ten types of herbaceous roots for the soil dressing seed spraying engineering. Ten types of herbaceous roots led to increase the c values and three led to increase the φ values. The ⊿c (c value increases) of MF, TF(N), RCG, TF(D) and ChF showed larger than the c _blank (c values of soil). Leaves and stems well grew with rich root system development of these five types of plants. Meanwhile, PRG showed the largest φ values of three types (PRG, RCG and HF) whose the φ values increased. Also, PRG had the largest values of dry weight of root and shoot and root length of all plants. Although the number of growers of RCG and HF was small, root dry weight per plant showed large values. Development of herbaceous root system appears to increase not only the c values but also the φ values of the soil specimen.