Soilless Media

Soilless Media
Plant and Soil Science
Standard 4 Objective 2
Soilless Media
 When raising plants there are many different options
for a growing media
 Most of the time think all plants grow in soil
 This is not the case
 Does anyone know the kind of growing media we
commonly use in our greenhouse?
 Is is soil? or a Soilless media?
Composition of Potting
 Soil (loamy, good structure, pesticide-free)
 Coarse aggregates for drainage (sand, perlite,
vermiculite, shredded plastics)
 Organic amendments to hold water (sphagnum peat
moss, tree bark, sawdust, rice hulls, shredded coconut
hulls, wood chip/sludge compost)
 Most contain no soil
Advantages of Soilless Mixes
 sterile
 lightweight
 good moisture retention and
 free of weed seeds
Disadvantages of Soilless
 minor elements are missing
 light weight - pots tip in strong
 transplants may not adjust well
to new media
Content of mixes
 Soilless mixes contain various
combinations of the following
 improves aeration
 of volcanic origin
Spahgnum Moss
 Dehydrated remains of acid bog plants
 Used to cover seeds because it is lightweight, controls
disease, and holds moisture.
Peat Moss
 Partially decomposed underwater vegetation.
 Holds moisture well
 Low in nutrients
 Exploded Mica
 Improves aeration
 Holds moisture very well
 Raises pH
 Technique of growing plants in non-soil medium
using feeding mixture of essential plant nutrients
dissolved in H2O
 Three main types
 static solution culture
 medium culture
 aeroponics

similar documents