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Varför så mycket dräneringmaterial?
Såhär står det på Mandalas hemsida angående dräneringmaterial.
Is it necessary to add anything for drainage such as perlite, vermiculite, sand, expanded clay pebbles?
It is best not to add any additional materials to your potting soil. Horticultural grade potting soil is perfectly mixed for the best air-water ratio. Adding more non-nutritive substances depletes the water retention capacity of the soil, it unnecessarily “stretches” the soil and reduces the total amount of nutrients available to the plant, and it creates dry pockets in the container.
Adding a large amount of perlite/vermiculite (some growers add as much as 25%!) is a completely outdated practice from 30-40 years ago when there was only a very small selection of horticultural potting soil available for non-commercial gardeners. It is one of the unfortunate harmful practices in cannabis cultivation that many still cling to although they do not understand the reason or consequences.
Especially harmful is to fill the bottom of the container with coarse materials such as expanded clay pebbles. This is where most roots grow down looking for water and nutrients! If they reach a dry and sterile layer of substrate the delicate root hairs shrivel, valuable space is lost where the plant requires rich soil that stores moisture and minerals.
http://www.mandalaseeds.com/Guides/Soil-Guide
Stämmer detta tycker ni? I princip varenda kotte man ser här använder ju lecakulor på botten och toppen samt en ca 30% perlite/vermiculit i jorden.
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