Viewing post #11479 by tapla
|Another thread is just fine - the more the merrier.
Let me see if I understand ...... Is your plan to take a conventional planting, one that is in the soil it came in from the greenhouse/nursery and set it in a container with 2" of water in it?
I'll wait for your reply before we visit more about the idea. There are lots of ways to go about hydro-culture, but I don't think any of them make use of conventional soils because of the toxic gases produced as anaerobic bacteria go to work on the organic material in the soils.
I hope you don't find me negative, but I probably would skip the pond water, though there probably isn't enough nutrition in it to hurt anything. I answered a question like this about aquarium water not long ago, and I'm going to go search for it. BRB
Ok - took a while, but I found it. This is a reply to someone who wanted to steep guinea pig poo and use the tea for fertilizer. The principle is the same - forgive, if it doesn't seem to be directly addressed to you. Pay particular attention to #4.
First, I'll admit that if you could get it to work out for you, that there would be a certain sense of satisfaction in knowing you did it. For myself, I don't think the risk:reward ratio warrants the use of a poo solution. I'm going to feel like a salmon swimming upstream here, but here's why I wouldn't use it:
1) You have no idea what you're supplying to your plants. How much of what nutrients. NPK, Ca, Mg, S, Fe ......?
2) The odds are very high that, because you have no clear idea of what a proper dosage might be, you'll either be applying too much or too little. Since your post infers you'll be careful, let's assume you'll be applying too little. (too little is probably the case for you, Don)
3) Because you'll be trying to remain on the safe side and will apply too little, nutritional deficiencies will develop. Any deficiency stalls growth, but it's unlikely you'll know which nutrient(s) is/are deficient, so you'll need to apply fertilizer anyway, if you wish to correct.
4) It's unlikely that the poo will contain a proper balance of nutrients, that certain nutrients will be well represented and some will be absent, or nearly so. If you then add a properly balanced fertilizer that is necessary, the additional nutrients in the soil from the poo are superfluous and only contribute unnecessarily to the level of total dissolved solids in the soil, which makes it more difficult for the plant to take up water and nutrients.
5) You're much better off to use a fertilizer that you can control the dosage of and that you KNOW has the right balance of nutrients, than you are to try to play a guessing game with a fertilizer that is high in some nutrients and low in or lacking others, and then try to correct the imbalance with a balanced fertilizer.
6) Organic forms of fertilizers (like poo and fish emulsions) rely on micro-organism populations in the soil to break down organic molecules into an elemental form that plants can use. These micro-organisms experience boom/bust cycles in container culture and cannot be relied upon to deliver the nutrients just because they are present in soils. If they are locked in organic hydrocarbon chains, they are unavailable until those chains are cleaved by soil organisms.
7) Organic fertilizers used on container media tend to form hydrophobic algal caps on exposed soil surfaces and encourage the proliferation of fungus gnats.
FWIW, none of the above are associated with the use of soluble fertilizers like MG or Foliage-Pro.
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