Mysterious boron comes in two allotropes; a brown
powder that looks rather identical to something you'd scrape off your
shoe and a glassy type that looks like miniature asteroids. Despite
being common, boron has a reputation for being fiendishly difficult to
isolate into elemental form.
These crystals measure about 3-8mm and are quite porous and lightweight.
Boron can be applied directly to soil, through fertigation, or as a
foliar spray. Because boron application rates are quite low, uniform
coverage is difficult to achieve when distributing by hand. The best
option is usually to combine boron with other fertilizers. Doing so can
help to decrease application costs and provide more even coverage.
(Application as a seed treatment is not recommended.)
As a soil amendment
Granular boron (2-4mm) can be directly applied to soil and can also be
bulk blended with other nutrients to provide specific boron rates,
depending on crop needs. Read more about Granubor's distribution rate in
bulk blended fertilizers.
Boron works well as part of fluid fertilizers—assuming you use
high-quality boron that is free from insoluble contaminants.
As a foliar spray
Foliar sprays are an excellent means of applying boron to tree, nut, and