Deficiencies show up first in younger leaves; they turn yellow. Boron
deficiencies resemble calcium deficiencies. Symptoms include stunting,
discoloration, death of growing tips, and floral abortion.
Deficiencies show first in new, young growth. Calcium moves slowly within
plants and concentrated in roots and older growth. That’s why young
growth shows deficiency signs first.
Believe it or not, chlorine is essential for plant growth. It’s
needed for photosynthesis. It’s an enzyme activator that assists production
of oxygen from water and in water transport regulation.
Deficiencies are rare, but express themselves
as chlorosis of younger leaves.
Deficiencies show up first on youngest leaves, young tips, buds and shoots.
Older leaves develop chlorosis, growing tips die and bud development is small.
Copper deficiencies cause irregular growth and pale green leaves that
wither at leaf margins.
Iron deficiency is common in many plants, especially those grown indoors. Deficiencies
initially show as interveinal chlorosis in young leaves, with leaf veins green in color
and older leaves unaffected. Leaves are smaller than normal.
Magnesium deficiencies show first in older, lower leaves. The symptoms start
from the margin inwards. The leaf mid-rib and veins remain green while leaf
margins are yellow or whitish, sometimes leaving a green arrowhead shape in
the centre of the blade.
Deficiencies show up in older and middle-aged leaves first, and then show up in
younger leaves. Molybdenum is rarely deficient in most plants, but chlorosis
symptoms similar to nitrogen deficiency are typical of molybdenum deficiency,
along with scorching and strapping of leaf margins.
Nitrogen deficiencies often appear first in older leaves, and will
manifest as a light green overall appearance.
Phosphorus deficiencies show up in older growth first. You will see leaf
tips curling downwards.
Potassium deficiencies show first in older leaves and are displayed as: yellowing;
singed or scorching of leaf margins with small necrotic areas that start small and
get bigger; brittle stems accompanied by withering leaf tips; interveinal chlorosis
starting at the base of young leaves; reddening and upwards leaf curl in older leaves.
Silicon is a very important plant nutrient. It is a vital component of
epidermal cell walls. It strengthens plants so they can fight off diseases
and resist insects, drought, heat and stress.
Deficiencies show up on older leaves first. Then they show up on younger leaves,
turning them light green, then yellow. These symptoms are accompanied by slow
growth. Leaves lose color, but veins remain green.
Zinc deficiencies are among the more serious of micronutrient deficiencies and
should be corrected as soon as they are diagnoses.