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Horticulture I - 5.00 - Soils
Terms in this set (34)
Is partially decomposed material mined from the swamps; good moisture holding properties
Is a mica mineral matter commonly used to start seed and cuttings; holds moisture and has a neutral pH.
Is a natural volcanic material; helps with soil aeration and water holding capacity.
is dead plant or animal tissue; contains carbon.
Is decayed organic matter;used for soil conditioning and fertilizer.
Is larger matter added to some horticulture media to promote drainage; added to a soilless mix usually makes the mix heavier.
Is dehydrated remains of acid bog plants; holds moisture and is very acidic.
Advantages of horticultural soils
1. The soil is sterile.
2. The pH is neutral.
3. The soil is disease and weed free.
4. It is good for starting disease sensitive seeds (tomato).
5. It is easy to control the nutrient content of the soil.
6. It improves crop uniformity.
7. It is easy to create a horticulture soil for particular plant needs.
Disadvantages of horticultural soils
1. It is expensive.
2. It is light weight.
Is rich in organic matter in various stages of decomposition and is dark in color. Most fertile layer in the soil profile.
Is the topsoil; below O Horizon; brown in color.
Is the subsoil; clayey soil that has a high mineral content; usually brown or reddish due to large amount of clay.
Is parent material; consists mainly of clumps of un-weathered rocks.
Is Bedrock; cannot be dug by hand
how the soil particles fit together
loose soil texture
granular soil structure
blocky or platy structure
soil structure best for plants
size of the particles
largest particles; low moisture and nutrient holding capacity
medium sized particles; good moisture and nutrient holding capacity
smallest sized particles; has high water and nutrient holding capacity
has almost equal parts of sand, silt, and clay; ideal texture for most non-container plants
the measure of acidity or alkalinity of soils; ranges from 0-14
0 - 6.9 pH
low pH - Acid soil
8 - 14 pH
high pH - alkaline soil
used to raise the pH value in soils (make soil less acidic)
Calcium / sulfur
used to lower the pH in soils (make soil more acidic)
the rate at which water moves through the soil
Water holding capacity
the ability to hold water for plant use
is the amount of air space between soil particles
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