Soil

Question 1

sand

Answer 1

biggest particles, less surface area

Question 2

silt

Answer 2

smaller particles than sand

Question 3

clay

Answer 3

smallest particles, most surface area

Question 4

loam

Answer 4

optimal for farming and growth
combination of the three+humus

Question 5

humus

Answer 5

organic material found in soils
partially decomposed organic matter mixed with topsoil and mineral soil

Question 6

humus has 100x

Answer 6

the capacity of clay to hold water and nutrients

Question 7

more ideal soil structure

Answer 7

reducing compaction
facilitating soil organisms

Question 8

prairies have more humus than forest

Answer 8

deeper root systems that die
more small plants that die
(smaller animals?)

Question 9

detritus

Answer 9

waste
dirt produced by erosion

Question 10

Agriculture impact on soil

Answer 10

depletes nutrients and strains water reserves

Question 11

fertilization

Answer 11

the addition of mineral nutrients to the soil
combats agri problem

Question 12

30% of world’s farmland

Answer 12

has reduced productivity due to soil mismanagement

Question 13

80-90%
96%
4%

Answer 13

of wet mass is h2o
of dry mass is co2/carbohydrates
of dry mass is inorganic substances/elements

Question 14

Macronutrients

Answer 14

Nitrogen, phosphorus, potassium
calcium
sulfur
magnesium

Question 15

nitrogen

Answer 15

important for leaves
protein synthesis

Question 16

phosphorus

Answer 16

flowering and fruiting
phospholipids
dead spots

Question 17

potassium

Answer 17

root growth, turgor and sugar movement

Question 18

micronutrients

Answer 18

Cl, Fe, B, Mn, Ni, Mo, Zn, Cu

Question 19

Bacterial symbionts

Answer 19

nitrogen fixing
some rhizopheric, some in soiil

Question 20

legumes

Answer 20

nitrogen fixing plants
rhizobium=n fixing bacteria
rhizobium gives N, gets sugar
live in plant nodules
crop rotation takes advantage of this