Key points to remember

• Matrix potential is very important in supplying water to plant roots.
• > compaction means > small pores > water holding capacity.
• Matrix potential is always negative
• > Concentration of solutes < osmotic potential
• Darcy’s law of flow of water: V or θ _{(flow/ time)} = -KΔHA/ L

Where, K = hydraulic conductivity

ΔH = Hydraulic head difference

A =Cross-sectional area

L= length of soil column

• Specific heat of dry soil is 0.2 cal/gm
• Loose soil has very low thermal conductivity
• Cutan: Modification of texture of soil