INFLUENCE OF PHOTOTHERMAL UNITS ON PHYSIOLOGICAL AND YIELD PARAMETERS OF RAINFED LOWLAND RICE

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dc.contributor.advisorUMAMAHESH, V
dc.contributor.authorNAVEEN, GALI
dc.date.accessioned2020-02-13T09:10:33Z
dc.date.available2020-02-13T09:10:33Z
dc.date.issued2019
dc.descriptionD5839en_US
dc.description.abstractA field experiment entitled “Influence of photothermal units on physiological and yield parameters of rainfed lowland rice” was conducted during Kharif season of 2018 at wetland farm, S. V. Agricultural College, Tirupati with three dates of sowing by using four varieties in factorial randomized block design replicated thrice. The three dates of sowing were 1st fortnight of June, 1st fortnight of July and 1st fortnight of August, whereas the varieties chosen were, MTU-1010, NLR-34449, BPT-5204 and NLR-3041. A decrease in all growth parameters and yield components were observed with delay in sowing in all the varieties. Among the varieties NLR-3041 recorded higher growth parameters viz., plant height (61.15 cm), leaf area (572.23 cm2 plant-1), total dry weight (11.52 g plant-1), LAI (1.88), CGR (15.26 g m-2 day-1), NAR (0.034 g cm-2 day-1), LAD (31.51 days) and yield components viz., number of tillers m-2 (591.89), number of productive tillers m-2 (290.95), number of grains panicle-1 (128.05), number of filled grains panicle-1 (93.23), grain yield (4744.44 kg ha-1) in all dates of sowings. Pollen viability and stigma receptivity were found to be not affected by dates of sowing. However, among varieties they differed significantly. Number of calendar days taken to attain maximum tillering, 50% flowering and harvest were more with 1st fortnight of June sowing (67, 108 and 136 respectively) followed by 1st fortnight of July sowing (58, 97 and 124 respectively) and 1st fortnight of August sowing (49, 87 and 112 respectively). Among varieties more number of days taken to attain maximum tillering, 50% flowering and harvest were recorded with NLR- 3041 (66, 107 and 135 respectively) followed by BPT5204, NLR-34449 and MTU-1010. Highest grain yield was achieved in 1st fortnight of June sowing (5255.24 Kg ha-1) followed by 1st fortnight of July sowing (3224.29 Kg ha-1) and 1st fortnight of August sowing (2062.84). Among varieties NLR-3041 recorded highest highest grain yield (4744.44 Kg ha-1) followed by BPT-5204 (3653.73 Kg ha-1), NLR-34449 (3353.69 Kg ha-1) and MTU-1010 (2681.13 Kg ha-1). With every delay in sowing there was a decline in accumulation of photothermal units, growing degree days and heliothermal units. The influence of these thermal indices were more pronounced in crop phenological stages. The maturity of the crop was found advanced with every delay sowing. The highest accumulation of photothermal units (31980.69oC day hr), growing degree days (2728.74oC day) and heliothermal units (12524.14oC day hr) from sowing to harvest was recorded in 1st fortnight of June sowing followed by 1st fortnight of July and 1st fortnight of August sowings. Among varieties highest accumulation of photothermal units (31147.68oC day hr), growing degree days (2606.38oC day) and HTU were found in NLR- 3041 from sowing to harvest followed by BPT-5204, NLR-34449 and MTU-1010en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810142996
dc.keywordsHOTOTHERMAL UNITS, PHYSIOLOGICAL, YIELD PARAMETERS, RAINFED LOWLAND RICEen_US
dc.language.isoen_USen_US
dc.pages185en_US
dc.publisherAcharya N G Ranga Agricultural University, Gunturen_US
dc.research.problemINFLUENCE OF PHOTOTHERMAL UNITS ON PHYSIOLOGICAL AND YIELD PARAMETERS OF RAINFED LOWLAND RICEen_US
dc.subCrop Physiologyen_US
dc.subjectnullen_US
dc.themeINFLUENCE OF PHOTOTHERMAL UNITS ON PHYSIOLOGICAL AND YIELD PARAMETERS OF RAINFED LOWLAND RICEen_US
dc.these.typeM.Scen_US
dc.titleINFLUENCE OF PHOTOTHERMAL UNITS ON PHYSIOLOGICAL AND YIELD PARAMETERS OF RAINFED LOWLAND RICEen_US
dc.typeThesisen_US
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