We are interested in testing the idea that exotic conifers (1) lower soil pH and that this (2) changes growth rates of native woody plants. We plan to collect soils from under exotic conifers and native woody species and grow native plants on these soils in a greenhouse. I am wondering what I can add to increase drainage to field collected soils that will not alter soil pH.? We usually add some cinder (being on a volcanic island) but I wonder have some affect I am not thinking of. More generally I wonder if soil pH can be expected to be stable in a watered greenhouse setting over time?
I suggest that you try something known to be inert such as vermiculite or pearlite.
perlite will be the best, I think. I agree with Paul Milham to use some inert material. Since you are in the greenhouse, I suggest to use some light material. Before starting your trial, you want to make sure that you have an analysis of your irrgation water.
I assume, a high drainage will wash out a certain amount of minerals in your soils. It depends the cliamte you want to simulate if you want to have a high drainage or if you want to avoid it. A coaster under the potted plants my help you to reduce water loss. It also helps you to get a compromise between water saturated soil and a high ari contend.
According to Dr. Paul Milham, I agree with the use of perlite, We try to reduce the soil of the greenhouse and we could reduce the pH from 7.5 to 7.2 for 4 years usage of Sulfuric acid and manure. Soil texture is lost and not recommended.
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