Physiological Karma Mahsuri MTU 1010 Mahamaya Stages D1 D2 D3 D1 D2 D3 D1 D2 D3 Phenology (Days)                   Planting 28 25 22 28 25 22 28 25 22 Tilliring 61 60 56 59 61 56 63 58 56 Panicle initiation 91 86 84 74 77 72 89 84 80 Panicle                   Emergence 108 102 99 89 94 88 105 100 93 Milking 114 109 106 98 102 97 112 108 102 Grain filling 126 119 116 108 112 107 112 118 111 Maturity 136 133 131 120 123 120 133 130 125 Growing degree-days (Cumulative)=Mean temp.-base temp. Planting 567 472 402 567 471 402 567 471 402 Tilliring 1114 1047 955 1078 1065 955 1147 1012 955 Panicle initiation 1640 1507 1458 1335 1349 1245 1605 1472 1385 Panicle Emergence 1945 1795 1729 1605 1650 1530 1891 1758 1621 Milking 2055 1922 1841 1765 1795 1693 2017 1903 1780 Grain filling 2256 2080 1995 1945 1972 1856 2195 2064 1920 Maturity 2410 2287 2209 2161 2143 2055 2365 2748 2120 Photothermal Units (Cumulative)=GDD*day length Planting 7530 6245 5313 7530 6245 5313 7530 6245 5313 Tilliring 14688 13723 12450 14237 13947 12450 15113 13278 12450 Panicle initiation 21357 19496 18702 17518 17557 16075 20924 19066 17808 Panicle Emergence 25701 23034 21971 20924 21259 19582 24441 22588 20707 Milking 26446 24528 23274 22889 23034 21551 25996 24316 22563 Grain filling 28793 26383 25085 25101 25120 23451 28082 26195 24204 Maturity 30604 28807 27533 17690 27116 25787 30098 28344 26542 Heliothermal Units (Cumulative)=GDD*SShr Planting 2449 1967 1399 2449 1967 1399 2449 1967 1399 Tilliring 3332 2851 2304 3239 2851 2304 3367 2817 2304 Panicle initiation 5035 4485 4270 3821 3955 3426 4923 4359 4030 Panicle Emergence 6474 6180 6340 4923 5040 4735 6125 5849 5532 Milking 7447 7110 7226 5581 6180 6061 7148 6950 6803 Grain filling 8964 8433 8452 6474 7573 7367 8541 8280 7956 Maturity 10190 10036 9644 8232 8994 8956 9962 9726 9436 Phenothermal index=GDD/days taken for each phenophase Planting 20 19 18 20 19 18 20 19 18 Tilliring 18 17 17 18 17 17 18 17 17 Panicle initiation 18 18 17 18 18 17 18 18 17 Panicle Emergence 18 18 17 18 18 17 18 18 17 Milking 18 18 17 18 18 17 18 18 17 Grain filling 18 17 17 18 18 17  20 17 17 Maturity 18 17 17 18 17 17 18 21 17 D1:-10 June 2012, D2:- 20 June 2012 and D3:-30 June 2012

Table 2: Influence of sowing dates on phenology and heat units of different rice varieties.