Physical Properties of Substrates Quiz

What is the definition of bulk density (BD) of substrates?

• The total volume occupied by the solid matter in the substrate

• The percentage of water content in the substrate

• The ratio between the dry substrate weight and the volume of the same wet substrate

• The weight of the substrate in kilograms

What is the equation to calculate porosity (P) of a substrate?

• P = BD - TD

• P = BD * TD

• P = 1 - (BD / TD)

• P = BD + TD

What is the range of bulk density for substrates mentioned in the text?

• 1.2-1.6 kg/L

• 0.10-0.80 kg/L

• 0.50-1.00 kg/L

• 0.80-1.20 kg/L

What does the water retention curve indicate?

• The relationship between the water potential and water content of the substrate

• The percentage of macropores and micropores in the substrate

• The distribution of water and oxygen in the substrate

• The bulk density of the substrate

What does the matrix potential (Ψm) account for in substrates?

• The effect of solute concentration on water potential

• The physical pressure exerted on water by its surroundings

• The potential energy per unit mass of an object in a gravitational field

• The adhesive and cohesive properties of water in porous materials

What does the gravitational potential (Ψg) refer to in substrates?

• The physical pressure exerted on water by its surroundings

• The adhesive and cohesive properties of water in porous materials

• The effect of solute concentration on water potential

• The potential energy per unit mass of an object in a gravitational field

What does the pressure potential (Ψp) represent in substrates?

• The potential energy per unit mass of an object in a gravitational field

• The physical pressure exerted on water by its surroundings

• The effect of solute concentration on water potential

• The adhesive and cohesive properties of water in porous materials

What does the osmotic potential (Ψo) measure in substrates?

• The adhesive and cohesive properties of water in porous materials

• The effect of solute concentration on water potential

• The potential energy per unit mass of an object in a gravitational field

• The physical pressure exerted on water by its surroundings

What does the saturation (S) represent in substrates?

• The condition where all pores are filled with nutrients

• The condition where all pores are empty

• The condition where all pores are filled with water

• The condition where all pores are filled with air

What does the field capacity (FC) represent in substrates?

• The water contained and retained in the roots of the plants

• The water contained and retained in the macropores

• The water contained and retained in the micropores

• The water contained and retained in the pores after allowing it to drain