Articles
NITROGEN FIXATION OF VARIOUS MATERIAL FROM A NUMBER OF EUROPEAN COUNTRIES BY THREE NITROGEN FIXATION TESTS
Article number
450_43
Pages
353 – 362
Language
Abstract
Three methods for determining N fixation were evaluated using a wide range of growing media materials from 4 countries.
The short term method (Nitrogen Drawdown Index method) was poorly correlated with the long term method (N-retention method) but was better correlated with the medium term method (N-immobilization). On the other hand the medium term method was more strongly correlated with the long term method.
It was concluded that a short term method is unlikely to give reliable results for all materials.
The N retention test carried out on two types of woodfibre produced by two thermomechanical processes fixed significant amounts of N. However, when a N source was added during the thermomechanical process, the product released significant amounts of N during incubation.
This would put severe limitations on products produced from these material where the product would need to be stored.
The short term method (Nitrogen Drawdown Index method) was poorly correlated with the long term method (N-retention method) but was better correlated with the medium term method (N-immobilization). On the other hand the medium term method was more strongly correlated with the long term method.
It was concluded that a short term method is unlikely to give reliable results for all materials.
The N retention test carried out on two types of woodfibre produced by two thermomechanical processes fixed significant amounts of N. However, when a N source was added during the thermomechanical process, the product released significant amounts of N during incubation.
This would put severe limitations on products produced from these material where the product would need to be stored.
Authors
M. Prasad
Keywords
N-retention test, N-immobilization test, N-Drawdown index, Woodfibre, Bark, Peat
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