Mane A. V.Shinde A. K.Kunkerkar R. L.Dodake S. B.Sawardekar S. V.MINAKSHI HEMCHANDRA KELUSKAR2024-05-032024-05-032024-02-26https://krishikosh.egranth.ac.in/handle/1/5810208637The present investigation entitled, “Morpho-physiological and biochemical characterization of rice (Oryza sativa L.) genotypes for their suitability under rabi environment of Konkan” was carried at Regional Agricultural Research Station, Karjat, Dist–Raigad (MH) during kharif - 2020,kharif-2021, rabi-20-21and rabi-21-22. The experiment was laid out with early duration rice germplasms in Split Plot Design with three replications to study morphological, physiological, biochemical characterization, thermo and photo sensitivity response of 40 early duration rice genotypes under kharif and different sowing windows during rabi season in Konkan and also to assess correlation of weather parameters with grain yield and to find out physiologically efficient, high yielding and stable genotypes for rabi season The results revealed that Hira and OR-1516-1-5-A showed the shortest days to maturity, while Ratnagiri-6 and Ratnagiri-1 required the longest time. Sowing in the 50th meteorological week with Ratnagiri-5 resulted in a longer maturity period, whereas kharif sowing with Hira resulted in a shorter duration. Ratnagiri-5 and Ratnagiri-1 required the most extended time to mature Karjat-3 had a higher average growth rate, Sahyadri-2 displayed a higher relative growth rate, and Phondaghat-1 demonstrated a higher net assimilation rate. Sowing in the 48th meteorological week with Hira resulted in a higher average growth rate, sowing in the 52th meteorological week with Ratnagiri-7 led to a higher relative growth rate, and sowing in the 50th meteorological week with Karjat-1 yielded a higher net assimilation rate Ratnagiri-711 recorded the highest growing degree days. Ratnagiri- 711 recorded significantly maximum growing degree days (1471.3° days)at first flowering stage which was at par with genotype Sahyadri-2, Sahyadri- 4 and Ambepandhari over rest genotypes. Karjat-4 recorded significantly maximum phenothermal index (18.192) from sowing to 50% flowering stage which was at par with Karjat-1 superior over the other genotype. IRRI-21 recorded the highest heliothermal units, and Karjat-4 recorded the highest photothermal units. Sahyadri-2 exhibited the highest rate of photosynthesis, followed by Sahyadri-4. At harvesting stage, the rice genotype Sahyadri-2 recorded significantly higher rate of photosynthesis (19.25 μmolco2/m2/sec) which was at par with Sahyadri-4(18.35 umolco2/m2/sec) and Ratnagiri-73 (18.32 μmolco2/m2/sec) over others. Sowing in the 50th meteorological week with Sahyadri-2 showed the highest photosynthetic rate. Ratnagiri-1 had the highest rate of transpiration, while Karjat-1 had the lowest. Sowing in the 52nd meteorological week with Karjat-7 resulted in a lower rate of transpiration. OR-1516-1-5-A exhibited higher stomatal conductance Sahyadri-4 had the highest number of tillers, followed by Sahyadri-2, IRRI-21, and Mhadi. Sowing in the 48th or 50th meteorological week with Sahyadri-4 resulted in a higher number of tillers. IRRI-34 exhibited the longest panicle length, followed by Sahyadri-2 and Sahyadri-4. Ratnagiri-6 had the highest number of filled spikelets per panicle, followed by Karjat-3. Sahyadri-4 had the highest yield per plant, followed by Karjat-3. Sowing in the 52th meteorological week with Sahyadri-4 resulted in the highest yield, followed by sowing in the 48th and 50th meteorological weeks.Sahyadri-4 recorded significantly maximum grain yield per plant ﴾24.62 g﴿which was at par with genotype Karjat-3 (23.93g) over other genotypes. Kharif season (24th MW) with Sahyadri-4 recorded significantly higher grain yield per plant (22.86 g) which was superior over other treatment combinations during pooled mean. The weather parameters maximum temperature and sunshine hours showed significantly positive and minimum temperature humidity and wind velocity showed significantly negative correlation with yield of rice genotype viz; Karjat-3, Karjat-7, Sahyadri-2, Sahyadri-4, Ratnagiri-5, Ratnagiri-7, Ratnagiri-24, IRRI-25, Sorati and Mhadi. Karjat-3 and Karjat-7 was found stable for yield in all environment whereas Sorati, Mhadi and China was found stable under favourable environment and Sahyadri-2 and Sahyadri-4 was found stable under unfavourable environment.EnglishThesis