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Calcium Nutrition Tips

Biomega Kristona Line

Calcium in plants

Today no one questions the assertion that Ca2+ is a crucial regulator of growth and development in plants. The myriad processes in which this ion participates is large and growing and involves nearly all aspects of plant development. Ca2+ is an essential element;  however, its  role  is  elusive. When examining total Ca2+ in plants, the concentration is quite large (mM), but its requirement is that of a micronutrient (mM). Ca2+ is not usually limiting in field conditions, still there are several defects that can be associated with low levels of this ion, including poor root development, leaf necrosis and curling, blossom end rot, bitter pit, fruit cracking, poor fruit storage, and water soaking.

 Cao 3D Structure     CaO 3D Structure

Calcium role in plants

  • Calcium is an essential plant nutrient. It has many roles: 
  • Participates in metabolic processes of other nutrients uptake. 
  • Promotes proper plant cell elongation. 
  • Strengthen cell wall structure - calcium is an essential part of plant cell wall. It forms calcium pectate compounds which give stability to cell walls and bind cells together. 
  • Participates in enzymatic and hormonal processes.
  • Helps in protecting the plant against heat stress - calcium improves stomata function and participates in induction of heat shock proteins. 
  • Helps in protecting the plant against diseases - numerous fungi and bacteria secret enzymes which impair plant cell wall. Stronger Cell walls, induced by calcium, can avoid the invasion. 
  • Affects fruit quality. 
  • Has a role in the regulation of the stomata.


Calcium deficiency syptoms

Calcium deficiency symptoms appear initially as localized tissue necrosis leading to stunted plant growth, necrotic leaf margins on young leaves or curling of the leaves and eventual death of terminal buds and root tips. Generally, the new growth and rapidly growing tissues of the plant are affected first. The mature leaves are rarely if ever affected because calcium accumulates to high concentrations in older leaves.

Ca Deficiency Symptoms


Crop specific symptoms


'Bitter pit'.  Fruit skins develop pits, brown spots appear on skin and/or in flesh and taste of those areas is bitter. This usually occurs when fruit is in storage, and Bramley apples are particularly susceptible. Related to boron deficiency, "water cored" apples seldom display bitter pit effects.

Cabbage and Brussels sprouts 

Internal browning and 'tip burn

Bitter Pit     Bitter Pit

Tomatoes and peppers 

'Blossom end rot'. Symptoms start as sunken, dry decaying areas at the blossom end of the fruit, furthest away from the stem, not all fruit on a truss is necessarily affected. Sometimes rapid growth from high-nitrogen fertilizers may exacerbate blossom end rot.


'Cavity spot'. Oval spots develop into craters which may be invaded by other disease-causing organisms.


Stunted growth, central leaves stunted.

 Blossom & Rot     Blossom & Rot

Biomega is offering a variety of liquid fertilizers containing calcium:

  • Kristona Ca
  • Kristona Ca-Mg
  • Kristona Ca-P