What Is Nitrogen Fixation?
Nitrogen fixation is the process of taking nitrogen in its abundant form
and converting it into nitrogenous compounds that plants and other
organisms can use. Discover the first step in the nitrogen cycle
associated with the bacteria in legume plants with information from a
science teacher in this free video on science.
Seven Wonders of the Microbe World'Seven Wonders of the Microbe World' series talking
about Microbes and why some are good, some are bad and what they have
done for mankind.
The Nitrogen Fixation Cycle: Presented by Dr. Undergrad.
Dr. Undergrad presents a basic introduction to the Nitrogen Fixation
Cycle. In this cycle nitrogen is fixated to become more biologically
available to the organisms of the world. Nitrogen from the atmosphere
will be fixated into a nitrate or the ammonium ion. Once fixated there
are a number of processes that the fixated nitrogen can undergo to pass
through the cycle until it returns back to the atmosphere.
Why Are So Many Atoms Used in Nitrogen Fixation?
Nitrogen fixation uses so many atoms, and it is so energetically
inefficient because there is a lot of energy keeping nitrogen molecules
bonded together. Discover why it's so difficult to separate two nitrogen
atoms with help from a science teacher and field biologist in this free
video on atoms and chemistry.
The Effects of Legume-based Rotational Cropping on Rhizobia Assemblage in an Irrigated Rangeland of Kenya
Nitrogen is one of the most important soil nutrients in agricultural
lands. Soil nutrient is commonly improved through the application of
inorganic fertilizers. However, the cost of inorganic fertilizers has
gone up in East Africa with the global rise in price of natural gas and
oil. One alternative is to enhance biological nitrogen fixation to
retain and improve soil fertility (Bala, 1999; Giller, 2001).
nitrogen fixation is derived through the symbiotic association of
legume roots and rhizobia in the soil. Soils without adequate compatible
rhizobia will not achieve much nitrogen fixation with the introduction
of grain legume. In East Africa, such soils are normally treated with
rhizobium inoculants in order to achieve proper nitrogen fixation and a
higher yield of pulse.
The main objective of the study was to understand
how rhizobia assemblages change in the soil with the introduction of
compatible field legume crops.
We compared rhizobia assemblages between
soils from plots with varying sequences of leguminous and non-leguminous
crops. We found that the rhizobia population significantly varies with
the introduction of legumes in the rotation systems.
Uduogu Austin Teaching Assistant, Student, Department of Geography and
Environmental Studies, University of Nairobi, Amistin Enterprises
Forestry; and Dr. Nathan Gichuki Senior Lecturer, School of Biological
Sciences, University of Nairobi )