Man's physical universe



Plants, like animals, require a proper acid-base balance. Soil containing

sodium nitrate in the form of Na+ ions and NOs" ions will soon

become alkaline due to the excess Na+ ions left in the soil as the NOa"

ions are removed to be utilized by the plant, unless this process is

balanced by a process in which such positive ions as K+ ions are taken

from the soil at nearly the same rate. An important principle in hydroponics

is that oppositely charged ions should be so paired in the solution

that they will be equally absorbed by the plant.

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