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Effect of rhizobium inoculation, molybdenum and lime on the growth and N2 fixation in P. vulgaris L
Author(s)
Bambara, Sylvie Karumeyi
Date Issued
2009
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
The study used common bean (P. vulgaris L. variety Provider) in a spilt-split-plot design involving 2
levels of Rhizobium inoculation (with and without rhizobia), 3 levels of lime (0, 2 and 3 t.ha-1) and 3 levels
of molybdenum (0, 6 and 12 g.kg-1 of seeds) in a glasshouse experiment. The glasshouse experiment was
then verified in the field during 2008 and 2009 cropping seasons. The aim was to assess the effects of
Rhizobium inoculation, molybdenum and lime supply on: i) yield and yield components of the P. vulgaris
L. ii) Changes in soil pH and the concentrations of selected plant-available nutrients in the rhizosphere,
iii) photosynthesis and chlorophyll formation in P. vulgaris L. and (iv) plant growth and N2-fixation in P.
vulgaris L.
The results showed that Rhizobium inoculation had significant effects in increasing yield components and
ultimately the final seed yield. Rhizobial inoculation also significantly increased the levels of chlorophyll
content in leaves, improved all photosynthetic parameters, increased dry matter yield of different organs
and decreased 15N values in all organs assessed. As a result, % nitrogen derived from atmosphere
(%Ndfa) in all organs as well as the amount of N derived from fixation was improved. In the field, the
whole plant level of N-fixation of P. vulgaris L. from Rhizobium inoculation accounted for approximately
33 kg N.ha-1. Furthermore, soil pH and the concentration of mineral nutrients (P, K, Ca, Mg, Na, Fe, Cu,
Zn and Mn) in the rhizosphere were significantly increased with Rhizobium inoculation when compared
with the control.
levels of Rhizobium inoculation (with and without rhizobia), 3 levels of lime (0, 2 and 3 t.ha-1) and 3 levels
of molybdenum (0, 6 and 12 g.kg-1 of seeds) in a glasshouse experiment. The glasshouse experiment was
then verified in the field during 2008 and 2009 cropping seasons. The aim was to assess the effects of
Rhizobium inoculation, molybdenum and lime supply on: i) yield and yield components of the P. vulgaris
L. ii) Changes in soil pH and the concentrations of selected plant-available nutrients in the rhizosphere,
iii) photosynthesis and chlorophyll formation in P. vulgaris L. and (iv) plant growth and N2-fixation in P.
vulgaris L.
The results showed that Rhizobium inoculation had significant effects in increasing yield components and
ultimately the final seed yield. Rhizobial inoculation also significantly increased the levels of chlorophyll
content in leaves, improved all photosynthetic parameters, increased dry matter yield of different organs
and decreased 15N values in all organs assessed. As a result, % nitrogen derived from atmosphere
(%Ndfa) in all organs as well as the amount of N derived from fixation was improved. In the field, the
whole plant level of N-fixation of P. vulgaris L. from Rhizobium inoculation accounted for approximately
33 kg N.ha-1. Furthermore, soil pH and the concentration of mineral nutrients (P, K, Ca, Mg, Na, Fe, Cu,
Zn and Mn) in the rhizosphere were significantly increased with Rhizobium inoculation when compared
with the control.
Additional information
Thesis (MTech (Horticulture Science))--Cape Peninsula University of Technology, 2009
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