Principles of Agricultural Science – Plant 1. 2 Potting Media Components Unit 3 – Soilless Systems Lesson 3.1 Mixing Media Principles of Agricultural.

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Presentation transcript:

Principles of Agricultural Science – Plant 1

2 Potting Media Components Unit 3 – Soilless Systems Lesson 3.1 Mixing Media Principles of Agricultural Science – Plant

3 Potting Media Goals Growing crops in containers require: Light weight potting media for shipping and handling Good porosity for drainage and aeration Good water retention to prevent containers from drying out too quickly Inexpensive

4 Media Ingredients Three types of ingredients are used in potting media Inorganic materials – minerals and substances derived from non-living matter Organic materials – substances derived from plant or animal tissues Soil enhancers – includes fertilizers, wetting agents (Soil Moist®), and soil chemistry buffers

5 Inorganic Materials For potting media, inorganic materials are typically volcanic materials, such as: Perlite Pumice Vermiculite These are light weight and very porous materials

6 Other Inorganic Materials Besides volcanic materials, man-made materials are used, such as: Plastic polymer beads Clay beads Rockwool Anything inexpensive, light, and that will not disintegrate in wet conditions.

7 Organics Organic materials absorb water and will break down to provide improved porosity Common materials used in potting media: Peat moss (sphagnum peat) Bark chips Sawdust Coconut fibers Seed hulls and husks

8 Soil Enhancers Because potting media provides plant roots access to everything they require, media can have enhancers mixed in for efficient plant growth. Some enhancement amendments: Fertilizers Wetting agents Lime or gypsum

9 Slow Release Fertilizers Potting media can be mixed with time release fertilizer pellets to provide steady plant nutrients over the length of the growing season. Common product name is Osmocote ®. These look like little round clay pellets.

10 Purchasing Media Potting media is typically sold two ways Bulk – loose, sold by the cubic yard Packaged – compressed in plastic wrapped bales, sold by the cubic feet

11 References Boodley, J. W. (1998). The commercial greenhouse (2nd ed.). Albany, NY: Delmar. Parker, R. (2010). Plant and soil science: Fundamentals and applications. Clifton Park, NY: Delmar.