Structure modifies the influence of texture in regard to moisture and air relationships, availability of plant nutrients, action of microorganisms and root growth. The structure of a soil is not permanent. Different structures include platy, prismatic, columnar, blocky, crumbly and granular soil. The rooting zone available to plants is restricted by the depth of a soil. This is very significant to soil use and management.
Soil color can serve as an indicator of many soil properties.
Organic matter content, drainage condition and aeration are soil properties related to color which are of interest to farmers. A gritty feeling indicates a sandy soil. Crumbly feeling indicates a silt. Sticky feeling indicates clay. Have students collect different samples from various locations around your school.