Author(s):

Banasmita Barman, Bondita Goswami, R Hussain, PG Khanikar, RL Deka, Kushal Sarmah, Gulab Singh and Abhinandan Singh

Abstract: Potato (Solanum tuberosum L.) is one of the most important food crops after wheat, maize and rice, contributing to food and nutritional security in the world. This tuber crop of the family solanaceae has about 200 wild species. Abovethe present study was conducted during Rabi season, 2016-17 at the Instructional-Cum-Research (ICR) Farm of Assam Agricultural University, Jorhat to study crop-weather relationships of potato grown under different micro-climatic environments: MR-I: 16^th November, MR-II: 1^st December and MR-III: 16^th December with three varieties: KufriJyoti, KufriPokhraj and Local following a split plot design with four replications. The results revealed that weekly mean maximum and minimum temperatures, morning and evening relative humidities, duration of bright sunshine hours and pan evaporation ranged from 24.0 to 30.2 °C, 8.0 to 18.0 °C, 91 to 100%, 44 to 66%, 3.2 to 8.8 Hours and 1.3 to 4.7mm per day, respectively. Most of the agroclimatic indices yielded higher correlation coefficients with final yield irrespective of varieties and microclimatic regimes for all growth stages. Tuber yield gave highest correlation coefficient of 0.77 against Accumulated morning relative humidity (ARH-I) corresponding to vegetative stage. A few predictive models involving accumulated indices was also developed combined over both varieties and microclimatic regimes corresponding to some selected crop growth stages. Most efficient predictive models were found for Accumulated Minimum Temperature (AMINT), Accumulated Morning Relative Humidity (ARH-I) and Accumulated Bright Sunshine Hours (ABSSH) corresponding to vegetative and reproductive stages.

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