The field experiment was conducted during summer season of 2014 and 2015 with the objective to develop the relationship between radiation interception and dry matter production in groundnut. The experiment composed of three dates of sowing and four irrigation regimes. Early sowing in 7 th MW and irrigation of 100 % of CPE through microsprinkler significantly increased absorbed photosynthetically active radiation. The radiation use efficiency showed increasing trend with advancement in crop age up to peg formation, thereafter, it was declined towards physiological maturity. Higher RUE was recorded under 7 th MW till peg formation. Higher values of fraction of PAR intercepted were recorded under groundnut sown at MW 7. The crop received higher irrigation showed significantly higher radiation interception. It was in the order of 100 % of CPE> 80 % of CPE > 1.0 IW/CPE> 60 % of CPE.
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