In the process of obtaining a protein concentrate
from defatted sunflower flour (Ordon˜ez et al., 2001), a
floating liquid can also obtained. This liquid (experimental
solution) contains high phosphorus and potassium
contents and a smaller amount of humic
substances and nitrogen, making it potentially useful
as a fertilizer. There are many studies that have shown
the availability of these elements in plants and their
numerous functions. Those functions related to potassium
are less specific, although equally important.
Phosphorus is an essential part of the process of photosynthesis.
Plants use the energy of sunlight, and P
must be present in the active parts of the plant for this
energy transfer to be made and for photosynthesis to