Good news, guys,
Semi-permeable osmotic membrane, used in controlled-release fertilizers, is now available for private growers. Now, we can make customized compositions of nutrients for slow release, at home, as needed. Membranes are delivered in the form of a ready-to-fill easy-to-use containers. You just fill it with 20g-30g of water soluble nutrients, weld the remaining end with a hot iron and put it in a root zone, one container per plant. This will feed your plant for approx six months while you are just watering. After six months you need to repeat.
If someone interested, let me know.
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