Unit 4 Flashcards
1
Q
3 largest rivers
A
Amazon, Congo, Yangtze
2
Q
5 factors of soil formation
A
Parent material, climate, topography, organisms, time
3
Q
Properties of soil
A
Sand, Silt, clay
4
Q
Sand
A
Largest, leaches, and doesn’t hold nutrients
5
Q
Silt
A
Middle, intermediate in holding nutrients and water well
6
Q
Clay
A
Smallest, doesn’t drain well, holds nutrients well
7
Q
Soil bases
A
Ca, Mg, K, Na can neutralize soil acids
8
Q
Soil acids
A
Harmful to plants
9
Q
4 Irrigation techniques
A
1.Furrow
2.Flood
3.Spray
4.Drip
10
Q
Furrow
A
Ditches of water between crop rows, 65% efficient, inexpensive, 35% runs off or is evaporated
11
Q
Flood
A
Flooding entire field, 70-80%
12
Q
Spray
A
Water is pumped and sprayed like a jumbo lawn sprinkler, 75-95%
13
Q
Drip
A
Slow drip hoses either on top or buried, 95%
