Vol. 12, Special Issue 7 (2023)

Author(s):
Priyanka, SK Bhardwaj, Dinesh Thakur and Kashish Walia

Abstract:
The index of variability is the measure of stability in different growth stages of plants. The wide fluctuations in terms of instability in phenological stages affect the crop output. The variation in timing of development events is the interaction of weather indices with date of particular growth events and the interval between them. To estimate the magnitude of instability the present investigation was undertaken in three agro-climatic zone of Himachal Pradesh by using Cuddy-Della Valle index. The results revealed that the zone wise irregularity to attained the various phenological stages as per instability index was higher (15%) at Kullu followed by 14.1 at Shimla and 10.8% at Kinnaur district.