Hello Dear, Micro-Kjeldahl N is the total amount of N present either any form released after acid digestion. You can say TKN (total kjeldahl Nitrogen), it is equivalent to total N while available N is the mineral form which is available by mineralization of organically bounded material or OM. About 98 % N is present in the soil or plant in organic form and only 2 % N is released as from mineral form in the ions e.g. Nitrate and Ammonium N.
So dear, if you want to estimate total N plaese follow protocol of Jackson, 1958 or Inderson and ingram, 1993.
however, about 28 forms of N found in the plant and soil, for example, geo-genic, biogenic, geologic, organic and in mineral form etc.
Whether contribution of nitrate-N is considered during the estimation of available nitrogen in soil?
Is available N equal to mineral N (NH4 + NO3) in soil? If not, then what is the relationship between available N and mineral N content in soil?
"available" N can be considered as nitrogen which is available for plant. So available N includes mineral N (ammonium and nitrate) and some forms of organic N. If this understanding is right, then how we should measure available N is still a problem for me. If somebody can help, it would be very grateful.
Is it acceptable to use soil total nitrogen as soil quality indicator rather than available nitrogen?
In aquatic ecosystems, available N is the nitrogen in the form of NO3 that can take up by aquatic plants and algae
Jamal Suliman Alawamy did u manage to get the answer to your question?. if yes may you share your findings.
Yes, but values will not be exactly of orginal one. It is because, inorganic elements are distributed heterogeneously
In the soil component. No body can report real picture without proper chemical analysis.
Second reason, several factors are responsible for augmenting nutrients concentration in the soil such as quality and quantity of organic matters, soil biota, climate, moisture level ( rainfall), soil texture etc.
Therefore, biogeochemical cycles for C, N and P are significantly varied spatiotemporally across the globe.
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