EVALUATION OF SOME RICE VARIETIES UNDER NORMAL SOWN AND DELAYED TRANSPLANTING SITUATION IN SALI WITH LOW LEVEL OF FERTILIZER INPUT

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dc.contributor.advisorKalita, U.C.
dc.contributor.authorDAS, OLYMPICA
dc.date.accessioned2024-07-18T05:29:20Z
dc.date.available2024-07-18T05:29:20Z
dc.date.issued2023
dc.description.abstractRainfed lowland rice cultivation holds significant importance, but it faces various challenges due to its heterogeneous ecosystem and unpredictable rainfall patterns, especially for farmers in flood-affected regions. Severe floods can lead to complete damage of seedlings in the main fields. However, some seedlings may survive in the seedbeds, offering an opportunity for farmers to replant their fields once the floodwaters recede, using overaged seedlings (60-70 days old). Therefore, the present investigation was carried out during the Sali season (July) of 2022 at the ICR Farm, Assam Agricultural University, Jorhat. The study followed a 3-replicated Randomized Block Design (RBD). The main objective of the trial was to assess the performance of various genotypes under normal sowing and delayed transplanting situations with 70day old seedlings. Considerable variation was observed among the grain yield and its associated component traits. The analysis of mean sum of squares for 18 quantitative characters indicated significant differences attributed to various sources of variation, particularly for grain yield and its component traits. The estimates of genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) were found high for chaffs per panicle, grains per panicle, number of panicles per hill, grain yield per hill (g/hill), spikelets per panicle, grain yield (kg/ha), straw yield (kg/ha) and biological yield (kg/ha). The present study evaluated traits such as chaffs per panicle, grains per panicle, spikelets per panicle, biological yield (kg/ha), straw yield (kg/ha), grain yield (kg/ha), grain yield per hill (g), and number of panicles per hill to exhibit high heritability, genotypic coefficients of variation, and genetic advance as a percentage of the mean. These findings suggest that selecting these traits could effectively lead to improvements under normal sown and delayed transplanting conditions with 70days old seedlings. Among the genotypes evaluated in this study, Gandhari stood out as the top yielder, showcasing a remarkable yield of 4201.5 kg/ha. This exceptional performance can be attributed to its significantly higher values for grains per panicle (172), spikelet fertility (89%), grain yield (18.7 g/hill), straw weight (6420.8 kg/ha), biological yield (10622.4 kg/ha) compared to Gitesh, grains per panicle (161.4), spikelet fertility (76.9%), grain yield (12.3 g/hill), straw yield (4691.7 kg/ha) and biological yield (7383.8 kg/ha) respectively. Furthermore, Gandhari showed moderate performance for the remaining evaluated characters. The analysis revealed a significant positive correlation of grain yield (kg/ha) with grain yield per hill (g/hill), biological yield (kg/ha), and straw yield (kg/ha) at both the genotypic and phenotypic levels. Other noteworthy genotypes, such as JR-16(3752.2 kg/ha) and JR-21(3670 kg/ha), also had higher yields compared to the check variety Gitesh (2691.6 kg/ha) and exhibited commendable performance in other traits. These genotypes showed promise for recommendation under normal sown and delayed transplanting situations, provided the investigation is extended for another 2-3 years followed by on-farm trials. Additionally, they could serve as potential parental material in hybridization programs aimed at developing suitable rice varieties for normal sowing and delayed transplanting situations specifically targeting flood-affected farmers of Assam in Sali season.
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810212167
dc.language.isoEnglish
dc.subGenetics and Plant Breeding
dc.themeEVALUATION OF SOME RICE VARIETIES UNDER NORMAL SOWN AND DELAYED TRANSPLANTING SITUATION IN SALI WITH LOW LEVEL OF FERTILIZER INPUT
dc.these.typeM.Sc
dc.titleEVALUATION OF SOME RICE VARIETIES UNDER NORMAL SOWN AND DELAYED TRANSPLANTING SITUATION IN SALI WITH LOW LEVEL OF FERTILIZER INPUT
dc.typeThesis
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