Greenhouse Management - Soil & Water

Question 1

What environmental factors affect growth?

Answer 1

Temperature, Water, Nutrition, Media, and Light

Question 2

What percentage of water does a plant contain?

Answer 2

70-90%

Question 3

Gravitational water

Answer 3

Water that Soil can’t hold against gravity

Question 4

Capillary water

Answer 4

Water that is held against gravity

Question 5

Optimal temperature for plants

Answer 5

86 degrees

Question 6

The _______ of light affects photosynthesis

Answer 6

Intensity

Question 7

Media

Answer 7

Clay, sponges, dirt, rocks, etc.

Question 8

What soil is made up of

Answer 8

Sand, silt, clay, and organic matter

Question 9

The three layers of soil

Answer 9

Topsoil, subsoil and bedrock

Question 10

The layer of soil containing the most organic matter

Answer 10

Topsoil

Question 11

This type of soil is desirable for most plants

Answer 11

Medium loam

Question 12

This soil particle drains well but doesn’t hold water or nutrients

Answer 12

Sand

Question 13

What is aggregation?

Answer 13

When soil particles cling together in large, crumb-like shapes

Question 14

Pros of soil-less media

Answer 14

Mix is mostly uniform, sterile, lighter and easier to handle, good drainage

Question 15

Cons of soil-less media

Answer 15

Easily blown over outside, micronutrients may be missing, issues when transplanting to soil

Question 16

Perlite

Answer 16

Volcanic origin, improves drainage

Question 17

Soil-less media with high water holding capacity

Answer 17

Sphagnum moss, peat moss and vermiculite

Question 18

Macroelements

Answer 18

Nitrogen, phosphorous, potassium, carbon, hydrogen and oxygen

Question 19

Secondary elements

Answer 19

Calcium, magnesium and sulfur

Question 20

Microelements

Answer 20

Boron, copper, chlorine, iron, manganese and zinc

Question 21

What pH range do plants prefer?

Answer 21

5.6-7.0

Question 22

Ideal air to water ratio for plants

Answer 22

50:50

Question 23

Cold temperatures slow the _______ process

Answer 23

Metabolic