lecture 9

Question 1

binding of soil together

Answer 1

soil aggregation

Question 2

two facets of soil aggregation

Answer 2

aggregate formation, aggregate stability

Question 3

soil particles to stick together

Answer 3

aggregate formation

Question 4

soil particle to remain aggregated

Answer 4

aggregate stability

Question 5

factors affecting aggregate formation

Answer 5

physical process, organism and organic matter, adsorbed cations

Question 6

wetting and. drying, freezing and thawing, root extension, tillage operation, action of soil organism

Answer 6

physical processes

Question 7

gels, viscous microbial products, bacteria and fungi

Answer 7

organism and organic matter

Question 8

dispersion or flocculation

Answer 8

adsorbed cations

Question 9

factors affecting aggregate stability

Answer 9

mechanical binding action, cementing action

Question 10

grouping/ arrangement of soil particles, modify the influence of soil texture, affects porosity

Answer 10

soil structure

Question 11

same as normal density

Answer 11

soil density

Question 12

mass of soil divied by the volume of soil solids

Answer 12

particle density

Question 13

mass of soil divided by the volume of soil solids + pore spaces

Answer 13

bulk density

Question 14

volume of soil occupied by air/ water

Answer 14

soil pores spaces

Question 15

structural peds

Answer 15

intraped

Question 16

between structural peds

Answer 16

interped

Question 17

soil moisture constant

Answer 17

water holding capacity, field capacity, permanent wilting point, hygroscopic coefficient