Hi all, Thanks for your sharing. In my lab, people used the continuous flow isotope mass spectrometer with elemental analyzer (Flash 2000 Delta V Advantage, Thermo Fisher Scientific.
Hi all, Thanks for your sharing. In my lab, people used the continuous flow isotope mass spectrometer with elemental analyzer (Flash 2000 Delta V Advantage, Thermo Fisher Scientific.
Hi all. You guys recommended methods but non of you mentioned about you experience in measuring mineral and and your % Recovery. There is serious problem in extracting with KCl (impurities) and low levels of mineral N in soil even after fertilizer application. Please look at your standard curves of N prepared in 2 M Kcl and then answere the question. Dr Naser Pakrou
Hi all. You guys recommended methods but non of you mentioned about you experience in measuring mineral and and your % Recovery. There is serious problem in extracting with KCl (impurities) and low levels of mineral N in soil even after fertilizer application. Please look at your standard curves of N prepared in 2 M Kcl and then answere the question. Dr Naser Pakrou
As mentioned by Mr.Elephant and Dr.Wehr,the NO3,NO2 and NH4 can be estimated in 2M KCl extract of soil.As the amount of NO2 N is less in 2N KCI extract,usually NO3 and NH4 will be estimated.The amounts of these ions can be estimated by distillation,autoanlyser/flow injection and colorimimetric methods.While NH4 is estimated by Indophenol blue colour method,NO3 can be estimated by several methods like cadmium reduction,nitrate specific ion electrode and phenoldisulphonic acid method.Nitrite is estimated by sulphanilic acid method.Over time these methods have been modified by several workers.
As mentioned by Mr.Elephant and Dr.Wehr,the NO3,NO2 and NH4 can be estimated in 2M KCl extract of soil.As the amount of NO2 N is less in 2N KCI extract,usually NO3 and NH4 will be estimated.The amounts of these ions can be estimated by distillation,autoanlyser/flow injection and colorimimetric methods.While NH4 is estimated by Indophenol blue colour method,NO3 can be estimated by several methods like cadmium reduction,nitrate specific ion electrode and phenoldisulphonic acid method.Nitrite is estimated by sulphanilic acid method.Over time these methods have been modified by several workers.
Soil mineral - N is NH4+ —N + NO3- —N. NH4+ —N concentration can be extracted by 2 M KCl and analyzed by using the phenate method (1). NO3- —N concentration can be analyzed by the phenol disulphonic acid method after extraction by CaSO4 (2). See the following reference and attached paper 1- APHA, 1985 2- Jackson, 1958
Soil mineral - N is NH4+ —N + NO3- —N. NH4+ —N concentration can be extracted by 2 M KCl and analyzed by using the phenate method (1). NO3- —N concentration can be analyzed by the phenol disulphonic acid method after extraction by CaSO4 (2). See the following reference and attached paper 1- APHA, 1985 2- Jackson, 1958
The supernantnat of extract obtained by 2 M KCL, if anlyzed by continuos flow-injection autoanlyzer provides the best estimate of mineral N fractions in the soil.
The supernantnat of extract obtained by 2 M KCL, if anlyzed by continuos flow-injection autoanlyzer provides the best estimate of mineral N fractions in the soil.
I think we,all the colleagues , have well discussed the question raised.
I think we,all the colleagues , have well discussed the question raised.
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Hi all,
Thanks for your sharing. In my lab, people used the continuous flow isotope mass spectrometer with elemental analyzer (Flash 2000 Delta V Advantage, Thermo Fisher Scientific.
Hi all,
Thanks for your sharing. In my lab, people used the continuous flow isotope mass spectrometer with elemental analyzer (Flash 2000 Delta V Advantage, Thermo Fisher Scientific.
More
VOTE
Hi all. You guys recommended methods but non of you mentioned about you experience in measuring mineral and and your % Recovery. There is serious problem in extracting with KCl (impurities) and low levels of mineral N in soil even after fertilizer application. Please look at your standard curves of N prepared in 2 M Kcl and then answere the question. Dr Naser Pakrou
Hi all. You guys recommended methods but non of you mentioned about you experience in measuring mineral and and your % Recovery. There is serious problem in extracting with KCl (impurities) and low levels of mineral N in soil even after fertilizer application. Please look at your standard curves of N prepared in 2 M Kcl and then answere the question. Dr Naser Pakrou
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I agree with the method of soil mineral N extraction and analysis suggested/ referred by Dr. Preeti Verma.
I agree with the method of soil mineral N extraction and analysis suggested/ referred by Dr. Preeti Verma.
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Hi all. You guys recommended methods but non of you mentioned about you experience in measuring mineral and and your % r
Hi all. You guys recommended methods but non of you mentioned about you experience in measuring mineral and and your % r
More
VOTE
As mentioned by Mr.Elephant and Dr.Wehr,the NO3,NO2 and NH4 can be estimated in 2M KCl extract of soil.As the amount of NO2 N is less in 2N KCI extract,usually NO3 and NH4 will be estimated.The amounts of these ions can be estimated by distillation,autoanlyser/flow injection and colorimimetric methods.While NH4 is estimated by Indophenol blue colour method,NO3 can be estimated by several methods like cadmium reduction,nitrate specific ion electrode and phenoldisulphonic acid method.Nitrite is estimated by sulphanilic acid method.Over time these methods have been modified by several workers.
As mentioned by Mr.Elephant and Dr.Wehr,the NO3,NO2 and NH4 can be estimated in 2M KCl extract of soil.As the amount of NO2 N is less in 2N KCI extract,usually NO3 and NH4 will be estimated.The amounts of these ions can be estimated by distillation,autoanlyser/flow injection and colorimimetric methods.While NH4 is estimated by Indophenol blue colour method,NO3 can be estimated by several methods like cadmium reduction,nitrate specific ion electrode and phenoldisulphonic acid method.Nitrite is estimated by sulphanilic acid method.Over time these methods have been modified by several workers.
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VOTE
Soil mineral - N is NH4+ —N + NO3- —N. NH4+ —N concentration can be extracted by 2 M KCl and analyzed by using the phenate method (1). NO3- —N concentration can be analyzed by the phenol disulphonic acid method after extraction by CaSO4 (2).
See the following reference and attached paper
1- APHA, 1985
2- Jackson, 1958
Soil mineral - N is NH4+ —N + NO3- —N. NH4+ —N concentration can be extracted by 2 M KCl and analyzed by using the phenate method (1). NO3- —N concentration can be analyzed by the phenol disulphonic acid method after extraction by CaSO4 (2).
See the following reference and attached paper
1- APHA, 1985
2- Jackson, 1958
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VOTE
The supernantnat of extract obtained by 2 M KCL, if anlyzed by continuos flow-injection autoanlyzer provides the best estimate of mineral N fractions in the soil.
The supernantnat of extract obtained by 2 M KCL, if anlyzed by continuos flow-injection autoanlyzer provides the best estimate of mineral N fractions in the soil.
More
VOTE
Hello All
Can some provide me the reference and methodology for mineral nitrogen determination by 1M KCl extracting method.
Thanks
Hello All
Can some provide me the reference and methodology for mineral nitrogen determination by 1M KCl extracting method.
Thanks
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Plz. find attached file for mineral -N determination. See at page No. 69-73.
Plz. find attached file for mineral -N determination. See at page No. 69-73.
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https://ahdb.org.uk/soil-mineral-nitrogen-testing-practice-and-interpretation
https://ahdb.org.uk/soil-mineral-nitrogen-testing-practice-and-interpretation
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