Record ID No. |
1715 |
Author(s) |
Lesueur, D., Sarr, A , 2008 |
Affiliation |
CIRAD, PERSYST Dept, UPR Ecosyst Plantat, Trop Soil Biol & Fertil Inst, CIAT, TSBF, World Agroforestry Ctr, POB 30677, Nairobi, KENYA |
Title |
Effects of single and dual inoculation with selected microsymbionts (Rhizobia and arbuscular mycorrhizal fungi) on field growth and nitrogen fixation of Calliandra calothyrsus Meissn |
Source. Vol.(no):Page |
Agroforestry Systems.73(1):37-45p |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Organism |
n.a. |
Country |
Kenya, Africa |
Abstracts |
Our study aimed to assess the effect of dual inoculation with the selected
Rhizobium strain KWN35 and the arbuscular mycorrhizal isolate BEG 176 (Glomus etunicatum) on the
growth of Calliandra calothyrsus cultivated under irrigation in the field in Senegal (Dakar) over
a period of 24 months. Although plants inoculated with both microsymbionts grew better (height
and root collar diameter) than plants from three other inoculation treatments (control, single
inoculation with KWN35 or BEG 176), these results were not statistically different except at 1
and 5 months after field transplantation. KWN35 was present in a relatively high percentage of
nodules harvested from plants inoculated with this rhizobial strain either alone or with
mycorrhiza (approximately 60% and 40% 1 and 2 years after field transplantation respectively).
The percentage of mycorrhizal root infections was around 60% in the inoculated plants after 12
months with significantly higher N, P and K foliar contents of trees compared with the
non-inoculated controls. However, as for nodulation, by 24 months after transplantation, there
were no significant differences between treatments. We conclude that field inoculation of C.
Calothyrsus with Rhizobium strain KWN35 and arbuscular mycorrhizal isolate BEG 176 did not have a
long-lasting effect on the growth of trees, even when a majority of nodules were occupied by the
inoculated rhizobia and the roots infected by the mycorrhiza. Several reasons can be postulated
for these results, such as a possible effect of soil fertility on the efficiency of the nodules. |