Saving Plant’s Life

Plants can’t use elemental nitrogen (N), they only take up nitrogen when it is in the NO3 or NH4 form. This means
that for each part of nitrogen you have three parts of oxygen with (NO3) or 4 parts of hydrogen with (NH4). When nitrogen is in a compound which is available to plants, nitrogen is only part of the compound. The same is true with
phosphorus and the other elements. Phosphorus is absorbed by plants as H2PO4–, HPO4 = or PO4 = depending
upon soil pH.