The field experiments were carried out at College of Agriculture Farm Rewa and Regional Agricultural Research Station, Kuthulia on Vertic haplurtalfs Soils, during rabi 1981-82, to study the influence of planting dates on Phenology and heat unit relationships under late sown conditions. The wheat cultivar sonalika was planted on 15 Dec., 23 Dec, 31 Dec. 1981 and 7th Jan. 82 at R.A.R.S., Kuthulia and on 16 Dec, 23 Dec, 30 Dec. 1981 and 6 Jan. 82 at College of Agriculture Farm. The results indicated that the requirement of accumulated heat units decreased with delayed planting. Besides growing degree days a unit incorporated the bright sunshine hours is also utilized (H.T.U.). A phenothermal index was also introduced (the AHU per growth day). It was nearly constant irrespective of planting dates and sites. The heat use efficiency decreased from 16.29 to 12.56 X 10"-* q/ha/GDD in case of D, to D4 respectively. A regression for predicting the maturity date for wheat crop using heat units accumulated upto flowering initiation for the Vindhyan region of Central India is developed.
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