Author(s):

Harithalekshmi V, Ajithkumar B, Lincy Davis P, Laly John C and Latha A

Abstract: The present study was carried out to assess the impact of weather variables on rice phenology. The field experiment was conducted at agricultural research station, Vellanikkara during kharif season. The experiment was laid out in split plot design. Main plot treatments were five dates of planting viz. June 5th, June 20th, July 5th, July 20th and August 5th planting. Subplot treatments were two rice varieties, Jaya (medium duration) and Jyothi (short duration). The weather data was collected from principal agromet observatory, Vellanikkara on a daily basis. The crop life cycle was divided into different phenophases. The field was monitored on a daily basis and the time of occurrence of different phenophases were noted. The duration of each phenophases were counted and recorded. The correlation analysis between weather variables and duration of phenophases revealed a significant influence of weather variables on rice phenology. Total crop duration was found to be decreasing with delayed dates of planting. A higher duration was observed during June 20th planting for both Jaya and Jyothi. A lower duration for Jaya was observed during July 20th and August 5th planting and for Jyothi it was observed during July 20th planting. After the correlation analysis it was understood that maximum temperature experienced during transplanting to active tillering, panicle initiation to booting, 50% flowering to physiological maturity reduced number of days taken to reach each phenophase while relative humidity and rainfall showed a positive influence on duration.

DOI: 10.22271/phyto.2021.v10.i1ah.13719

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