Field studies on different growth parameters were made on three potato varieties viz., Rufri Chandramukhi (early maturing), Kufri Jyoti (medium late maturing) aud Kufri Sindhuri (late maturing). The tuberization was found to be earlier in Kufri Chandramukhi in both the crop seasons. All the three varieties produced long stolons during spring, when higher values of dry matter in the tops and lower in the tubers were obtained due to high temperatures and long photoperiods. Maximum percentage of total drymatter was accumulated in the leaves comparatively earlier in Kufri Chandramukhi during autumn than in spring. However, in spring season, late tuber initiation and slow tuber enlargement resulted in continuous growth of the foliage, and LAI increased till final harvest. In autumn, LAI increased to a maximum value till the vegetative growth ceased. Early attainment of maximum NAR and RGR values during autumn led to enhanced growth while in spring NAR and RGR attained their peak values quite late. Higher values of LAI during early period of growth in Kufri Chandramukhi resulted in maximum HI as compared to other varieties.
