It has been proved in the present paper that the previously reported method for forecasting the number of spikelets per panicle by measuing the thickness of the first elongated inter-node can be satisfactorily applied to rice plants cultivated in different years, and furthermore, even the number of spikelets per hill can also be predicted from the sum of thickness of the first elongated inter-nodes of all tillers thicker than 6 mm² in thickness in an average hill in the period subesequent to the maximum tiller-number stage and the middle stage of spikelet primordium differentiation.