Thermal indices in relation to crop phenology of wheat (Triticum aestivum L.) and urd (Vigna mungo L. Hepper) at Tarai region of Uttarakhand
Keywords:GDD, HTU, PTU, PTI, Thermal use efficiencies.
Field experiments were conducted during kharif and rabi seasons of 2007-08 and 2008-09 at GBPUAT Pantnagar, Uttarakhand to study phenology and GDD, PTU, HTU and PTI for wheat and urd crops at Tarai region of Uttarakhand. Wheat crop were sown on 18 November 2007 and 1 November, 2008 during rabi seasons and urd crop were sown on 7 July 2007 and 20 July 2008, during kharif season. Results revealed that mean GDD, HTU, PTU for wheat and urd crops were 2016, 14383, 22745 and 1592, 8586, 20813 respectively. Physiological maturity can be predicted for wheat and urd by using GDD, HTU, PTU with R2 0.98 and 0.99 respectively. During 2007-08 the HUE for wheat was 2.28 kg grain/ha degree days-1 with grain yield 4250 kg/ha and during 2008-09 HUE was 1.84 kg grain/ha degree days-1 with grain yield 3978 kg/ha. During 2007 the HUE for urd was 1.18 kg grain/ha degree days-1 with grain yield 1878 kg/ha and during 2008 HUE was 0.99 kg grain/ha degree days-1 with grain yield 1584 kg/ha.
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