Inhibition of nodulation of Indigofera cordifolia by Aristida adscensionis.

The paper reports a possible allelopathic potential of Aristida adscensionis Linn. on the nodulation of Indigofera cordifolia Heyne ex. Roth., at Rajkot (India). When individual plants of I. cordifolia were excavated from plots where it grows in association with A. adscensionis and where A. adscensionis is absent and the nodule numbers counted, it has been observed that the number of nodules was fewer in plants when it grows in association with A. adscensionis. Statistical analysis of the results has confirmed that the standard error of difference in means is highly significant at 1% probability level. Hence it appears that A. adscensionis has some inhibitory effect on the nodulation of I. cordifolia through some mechanism which is yet to be determined. Further work in this direction is in progress.