The micronutrients, major nutrients, and water, all go through the roots quite efficiently. And orchids have evolved to be very efficient, needing very little in the way of nutrients. (If you are growing on the side of a tree, you have to get by on nutrients from decaying detritus that get dissolved in rain. And you have to avoid desiccation when the sun comes out) Roots do an excellent job of capturing the water and nutrients. Leaves do an excellent job of controlling water loss along with their photosynthesis. It makes sense to put the nutrients where they will be efficiently absorbed, and not put stuff on the leaves that will leave deposits that look ugly and may even interfere with photosynthesis if they block enough light.
|
Hybrid Mode
