Announcements

Job offersmore »

Tweeting Growers

Top 5 - yesterday

  • No news has been published yesterday.

Top 5 - last week

Top 5 - last month

Exchange ratesmore »




Substrates for hydroponics and aquaponics

A substrate, also called a medium or media, is a supporting material or base on which a plant can grow. The most commonly used substrates are: Rockwool, lightweight expanded clay aggregate, coco coir, coco chips, perlite, vermiculite, peat moss, lava rock, river rock, and sand. Some uncommonly used substrates include: oasis cubes, floral foam, growstones, pine shavings, pine bark, polyurethane foam, water-absorbing polymers and rice hulls. A good substrate supports the plant, allows for air flow, and is porous.

Buffering capacity is a measure of how efficient a substrate resists changes in pH. A high buffering capacity will neutralize a nutrient solution if an acid or base is added. Porosity is the amount of open space that allows for air exchange in a substance. A high porosity material will allow for more air exchange. Water holding capacity is the amount of water a substance can retain. A substrate with a low water holding capacity does not retain water well. Cation-exchange capacity is the amount of salts or ions a particular substance can store. A high cation-exchange capacity would allow for a high salt content in the material that may be used at a later time when the liquid solution may be devoid of salt content.

Read more at the Stuppy blog (Scott Moore)

Publication date: 11/17/2017

 


 

Other news in this sector:

7/20/2018 Small amount of zinc essential for formation of growth substance of the plant
7/13/2018 Commercial growers get new wood fiber option
7/5/2018 Response of bell pepper to cultivation in coconut fiber or soil
7/2/2018 "Growing has never been so precise"
6/28/2018 "Plants less susceptible to crazy roots with organic substrate"
6/26/2018 "Vigorous crops well balanced all year round"
6/12/2018 US (WA): Turning urban wood waste into biochar
6/11/2018 Australian strawberry grower increases yield with rockwool
6/8/2018 Loco about Coco
6/4/2018 Jiffy Products Sri Lanka successfully EU Organic certified
5/30/2018 Poland: New carbon substrate from organic raw material
5/23/2018 "Reducing labour costs and improving crop growth in soft fruit"
5/22/2018 Strawberry growers in Spain move out of soil
5/16/2018 Oasis starts offering Rootcubes retail packs
5/4/2018 "Greatest gains expected after summer solstice"
4/26/2018 Development of substrates for multilayer cultivation in high-tech phytotrons
3/29/2018 US: 100th independent trial of soil health product on bell peppers
3/28/2018 US (NY): Cornell student to develop weed-free growth media
3/15/2018 King Willem-Alexander opens new compost factory for mushroom substrates
3/1/2018 Benefits of maintaining the optimum substrate oxygen level