Jadam organic Farming & Gardening : The Way to Ultra-Low-Cost Agriculture, Make All-Natural Fertilizer, Pesticide and Microorganism Inputs Yourself

Boron (B)
Boron is presumed to play an important role in cell elongation, nucleic acid
synthesis, hormone response and the functions of the cellular membrane.
Its deiciency causes black necrosis on young leaves, and terminal buds.
Necrosis of young leaves begins with the basal end of leaves. Stems become
abnormally stiff and crumbly. Many branches may shoot out sideways but
the end of the stem is easily necrotized because cell division is inhibited.
Destruction of internal tissues of fruit and roots causes necrosis and defor-
mity. 
Potassium (K)
Potassium exists in the form of K
+
in plants and plays an important role in
the controlling of osmotic pressure in plant cells. It also activates enzymes
included in breathing and photosynthesis. If it is deicient, leaves become
stained and chlorosis on leaf margins and necrosis between venations of the
leaf apex occurs. As potassium can transfer to young leaves, problems begin
with mature leaves and progress to the basal end of plants, so leaves become
rolled and shrunk. 
Calcium (Ca)
Calcium is used for formation of spindle ibers during synthesis of new cell
walls and cell division in the form of Ca
2+
. It is also a signal transmitter of
various responses of plants to normal functions of plant cell membrane and
hormone signals. Its deiciency causes necrosis in tissues with fast cell divi-
sion such as at the ends of young leaves. In slow-growing plants, chlorosis
occurs irst and new leaves are rolled downward, showing malformation.
ULC영어본문.qxp_레이아웃 1 2016. 2. 19. 오후 6:44 페이지 219

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JADAM Organic Farming 
Magnesium (Mg)
In the form of Mg
2+
, magnesium activates the enzymes related to breathing,
photosynthesis and synthesis of DNA and RNA. It is a major component
of chlorophyll that performs photosynthesis. Its deiciency causes chlorosis
between veins of leaves. It begins with old leaves because of the mobility of
magnesium. Severe deiciency causes leaves to turn yellow or white.