Author(s):

Vinu KS, Shajeesh Jan P, B Ajithkumar and Arjun Vysakh

Abstract: An experiment was conducted to study the influence of weather parameters on growth indices of groundnut using split plot design with four planting dates viz., November 1^st, November 15^th, December 1^st, and December 15^th. The groundnut variety TNAU CO-6 was used in the experiment. The seasonal variation of different biotic events of groundnut was pronounced in the study. The result indicated that, for all the growth characters such as plant height, number of leaves and dry matter accumulation were found to be highest during November 1^st planting. The highest pod yield, shelling percentage and harvest index were also recorded during this period. Number of days taken to reach each phenophases varies significantly with date of planting. The maximum duration was recorded during December 1^st planting while minimum during November 1^st planting. The influences of weather parameters on various critical stages of groundnut were distinct. As the crop is short day plant, negative influence of sunshine hours during flowering period was much noticeable hence adjusting date of planting coinciding with short days favors the yield.

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