| Pak. J. Bot., 39(1): 255-264, 2007. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
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INTERACTIVE EFFECT OF RHIZOBIUM STRAINS AND P ON SOYBEAN YIELD, NITROGEN FIXATION AND SOIL FERTILITY ZARRIN FATIMA, MUHAMMAD ZIA AND *M. FAYYAZ CHAUDHARY Abstract: Pot studies under natural conditions were undertaken to determine the
effect of various exotic Bradyrhizobium japonicum strains viz.,
TAL 377, 379, 102 used alone or in mixture with and without phosphorus
on soybean growth, yield and nitrogen fixation parameters. Surface sterilized
soybean seeds (NARC-4 var.) coated with Rhizobium strains were
sown in earthen pots. Phosphorus (P) was applied as single super phosphate
(SSP) at the time of sowing in the soil. Nitrogenase activity, pink
bacteriodal tissue volume and specific nitrogenase activity was determined
at flowering stage. These parameters were relatively higher when mixed
rhizobial strains were applied in combination with P. However, efficiency
of different rhizobial strains for specific nitrogenase activity and
other parameters was TAL102>TAL379>TAL377 either alone or in combination
with P. Application of Rhizobium strain and P also increased
the growth and yield of soybean and also improved soil fertility and
NPK uptake by plant tissues. It is concluded that increase in soybean
yield can be achieved by applying Rhizobium mixed culture with
phosphorus, which also improved soil fertility for sustainable agriculture
system.
Department of Microbiology, Faculty of Biological Sciences, Quaid-i-Azam
University, Islamabad. Pakistan. |
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