THE EFFECT OF PLANT WATER POTENTLAL
ON NITROGEN FIXATION OF SOYBEANS
John Nene-Osom Azu, M.Sc. Supervisor:
University of Guelph, 1975 Professor J.W. Tanner
Field experiments at two sites, Elora and Arkell,were conducted
to investigate the effect of plant water potential on the nitrogen
fixation of two soybean cultivars, Vansoy and Anoka. The treatments
were Vansoy and Anoka both under irrigated and non-irrigated conditions.
The acetylene reduction technique was employed to estimate
nitrogen fixation of nodules and measurements of plant water potential
were made using the pressure chamber technique.
Nitrogen fixation and plant water potential measurements were
made at various stages during the entire growing period of the soybeans,
and the results showed that water stress which was related to low plant
water potential caused a reduction in nodule numbers, fresh weight and
dry weight. There was evidence that moderate moisture stress mainly
affected the amount of nodule tissue formed and not nitrogen fixing
efficiency whereas severe stress led to reduction in both nodule
mass and efficiency of fixation.
The total seasonal amount of nitrogen fixed by Vansoy and Anoka
was reduced substantially by water stress while high plant water potential resulting from irrigation led to large amounts of nitrogen fixed.
Regression analysis of nitrogen fixed with plant water potential
indicated that reduction in plant water potential was accompanied byreduction in the amount of nitrogen fixed, thus showing a relationship
between plant water potential and nitrogen fixation.
Irrigation substantially increased seed yields of Vansoy and
Anoka at Arkell, but there was no significant increase in either
variety at Elora.
PSN, A (2021). The Effect Of Plant Water Potential On Nitrogen Fixation Of Soybeans. Afribary.com: Retrieved May 08, 2021, from https://afribary.com/works/the-effect-of-plant-water-potential-on-nitrogen-fixation-of-soybeans
Africa, PSN. "The Effect Of Plant Water Potential On Nitrogen Fixation Of Soybeans" Afribary.com. Afribary.com, 09 Apr. 2021, https://afribary.com/works/the-effect-of-plant-water-potential-on-nitrogen-fixation-of-soybeans . Accessed 08 May. 2021.
Africa, PSN. "The Effect Of Plant Water Potential On Nitrogen Fixation Of Soybeans". Afribary.com, Afribary.com, 09 Apr. 2021. Web. 08 May. 2021. < https://afribary.com/works/the-effect-of-plant-water-potential-on-nitrogen-fixation-of-soybeans >.
Africa, PSN. "The Effect Of Plant Water Potential On Nitrogen Fixation Of Soybeans" Afribary.com (2021). Accessed May 08, 2021. https://afribary.com/works/the-effect-of-plant-water-potential-on-nitrogen-fixation-of-soybeans