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Micronutrients For Your Plant Growth​


Micronutrients  are  essential  for  plant  growth  and  play  an  important  role  in  balanced crop nutrition. They include boron, copper, iron, manganese, molybdenum, zinc, nickel and chloride. 
They  are  as  important  to  plant  nutrition  as  primary  and  secondary  macronutrients, though plants  don't  require  as  much  of  them.  A  lack  of  any  one  of  the  micronutrients  in  the  soil  can limit growth, even when all other nutrients are present in adequate amounts.

Through  soil  testing  and  plant  analyses,  micronutrient  deficiencies  have  been  verified  in  many 
soils. Some reasons limiting the incidental additions of micronutrients include:
• High-yield crop demands remove micronutrients from the soil
• Increased use of high-analysis NPK fertilizers containing lower quantities of micronutrient 
• Advances in fertilizer technology reduce the residual addition of micronutrients.

These  factors  contribute  to  the  significant  increase  in  usage  of  and  need  for  micronutrients  in 
order to achieve full balanced nutrition.

Boron (B),  one  of  the  most  important  micronutrients  affecting  membrane  stability,  supports 
the structural and functional integrity of plant cell membranes. Boron-deficiency symptoms first 
appear at the growing points, and certain soil types are more prone to boron deficiencies.

Copper (Cu) activates enzymes and catalyzes reactions in several plant-growth processes. The 
presence  of  copper  is  closely  linked  to  Vitamin  A  production,  and  it  helps  ensure  successful 
protein synthesis.

Iron  (Fe)  is  essential  for  crop  growth  and  food  production.  Iron  is  a  component  of  many 
enzymes associated with energy transfer, nitrogen reduction and fixation, and lignin formation.


Manganese (Mn)  activates  several  important  metabolic  reactions  and  plays  a  direct  role  in 
photosynthesis.  Manganese  accelerates  germination  and  maturity  while  increasing  the 
availability of phosphorus (P) and calcium (Ca).


Molybdenum  (Mo)  is  vital  for  the  process  of  symbiotic  nitrogen  (N)  fixation  by  Rhizobia 
bacteria  in  legume  root  modules.  Considering  molybdenum’s  importance  in  optimizing  plant 
growth, it's fortunate that Mo deficiencies are relatively rare in most agricultural cropping areas.


Zinc (Zn)  was  one  of  the  first  micronutrients  recognized  as  essential  for  plants  and  the  one 
most commonly limiting yields. Although Zinc is required only in small amounts, high yields are 
impossible without it.

Chlorine (Cl)  is active in energy reactions in the plant. Most Chlorine in soils comes from salt 
trapped in parent materials, marine aerosols and volcanic emissions.

Nickel (Ni)  is important in plant nitrogen metabolism because it is a component of the urease 
enzyme.  Without  the  presence  of  Nickel,  urea  conversion  is  impossible.  It  is  required  in  very 
small amounts, with the critical level appearing to be about 0.1 ppm.

Application with Mixed Fertilizers
The  most  common  method  of  micronutrient  application  for  crops  is  soil  application. 
Recommended  application  rates  usually  are  less  than  10  lb/acre  (on  an  elemental  basis),  so 
uniform  application  of  micronutrient  sources  separately  in  the  field  is  difficult.  Therefore,  both 
granular  and  fluid  NPK  fertilizers  are  commonly  used  as  carriers  of  micronutrients.  Including 
micronutrients  with  mixed  fertilizers  is  a  convenient  method  of  application,  and  allows  more 
uniform  distribution  with  conventional  application  equipment.  Costs  are  also  reduced  by 
eliminating a separate application.​


Source: http://www.cropnutrition.com/efu-micronutrients

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