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A field experiment was conducted during kharif season of 2011 at Agro-meteorological Research Farm of N.D. University of Agriculture & Technology, Kumarganj, Faizabad (U.P.) as to study the crop-weather interaction studies in pigeonpea (Cajanus cajan (L.) Millsp). The experiment was conducted with Split plot design. The treatment consisted 9 combinations comprised of three sowing dates of sowing on June 25th (D1), July 05th (D2) and July 15th(D3) were considered as main plot treatment and three varieties viz., Narendra Arhar-1 (V1), Narendra Arhar-2 (V2) and Bahar (V3) were sub-plot. Thermal use efficiency was recorded significantly highest at all the phenophases in sowing done on June 25th of pigeonpea sowing Narendra Arhar-2 variety we found more thermal efficient and intercepted more solar radiation for growth, development and yields of pigeonpea crop. Relationship between accumulated GDD and dry matter accumulation of pigeonpea sown on June 25 developed. Dry matter was linearly correlated with accumulated GDD (R2=0.95) indicating that dry matter increased with increase of accumulated GDD. Relationship, between canopy temperature during ripening stage and seed yield of pigeonpea developed. Trend line indicate that seed yield decreased linearly with increase of canopy temperature with R2 = 0.98. Yield decreased by 50 kg with every increase of 1 °C canopy temperature.
Keywords: Canopy temperature, sowing date, efficiencies, pigeonpea cultivars, thermal heat, sowing temperature.