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Nitrogen and Phosphorous
Terms in this set (10)
What are elements essential for plant growth?
Nitrogen and Phosphorous (and potassium)
What is the role of Nitrogen in plant development?
Promote root development and leaf growth. Required for the formation of nucleic acids, proteins and chlorophyll.
What is the role of Phosphorous in plant development?
regulate leaf growth and plant size. required for the formation of nucleic acids.
What is an accessible form of nitrogen for plants?
What is a disadvantage to using ammonia?
It is a toxic gas which is difficult to handle
What are fixed phosphates?
Phosphate ions that cannot be absorbed, ie not soluble - PO₃³⁻ and HPO₃²⁻
What is an available phosphate?
One that is soluble in water and therefore is accessible to plants, ie compounds of the dihydrogenphosphate ion, H₂PO₃⁻
How can fixed phosphates be converted to available phosphates?
By reacting it with an acid and therefore producing H₂PO₃⁻
Why is converting fixed phosphates to available phosphates a slow process?
Because the acid concentrations in the soil are low due to carbonic acid or decaying vegetable matter
What is a slow-release fertiliser?
Where the bacterial conversion of nitrogen and phosphate compounds to fixed nitrogen and available phosphate is slow. (commonly occurring in natural fertilisers)
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