Vol. 11, Issue 12 (2022)

Author(s):
Shahana Begum, Shalini Pillai P, Jacob John, Rajasree G and Manju RV

Abstract:
The investigation was conducted during the summer season of 2021 from February–June at Integrated Farming System Research Station (IFSRS), Karamana, Thiruvananthapuram, Kerala. The lowland rice genotypes viz., Prathyasa and KAU Manu Rathna and aerobic rice variety, Sharada were grown in PVC tubes of 8” diameter and were subjected to different water regimes (flooded, saturated and aerobic condition), with and in the absence of biofertilizer, Azospirillum lipoferum KAU isolate. The growth attributes of these genotypes at panicle initiation, flowering and harvest stages and yield attributes at harvesting stage were recorded. The results showed that the plant height, leaf area index (LAI) and dry matter production (at harvest) of the genotype, Sharada were considerably higher than the other two genotypes at all the growth stages. Among the different water regimes, these parameters were significantly reduced under aerobic condition as compared to flooded and saturated condition. Similarly, the yield attributes and yield differed under different genotypes and water regimes. The number of filled grains panicle^-1, 1000 grain weight, grain yield and harvest index were remarkably higher under Sharada and its sterility percentage were also lesser as compared to Prathyasa and KAU Manu Rathna. With respect to water regimes, significant reductions in these yield parameters were observed under aerobic condition over flooded and saturated condition. The presence of biofertilizer, Azospirillum lipoferum had no significance with respect to growth and yield attributes of rice.