SOIL AND PLANT ANALYSIS (1+1)

FAQ's

1. What is meant by soil structure?

Answer: The arrangement of individual soil particles into different aggregate forms is known as soil structure.

2.Narrate the significance of soil structure
Answer: Structure is an important parameter in respect of water movement, heat transfer, aeration and porosity of a soil. The above factors in turn influence the germination of seeds, root development and microbial activities in soil.

3. List out cementing materials that aid in soil structure formation.
Answer: Colloidal clay, Fe & Al hydroxides, decomposing organic matter etc.

4. Differentiate a ped from clod.
Answer: Natural aggregates are peds where as clod is an artificially formed soil mass due to ploughing and digging.

5. How bulk density of a soil is influenced by soil structure?
Answer: Bulk density varies with the total pore-space present in the soil. Structure chiefly influences pore-space. Platy structure with less pore-space has high bulk density. Crumb structure with more total pore-space has low bulk density.

6. Name the techniques of aggregate analysis.
Answer: a. Wet and dry sieving
b. Elutriation
c. Sedimentation