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Subject: Crop Physiology × Author: Sarmah, Bhargob × End date: 2017 × Start date: 2017 ×
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    ThesisItemOpen Access
    EVALUATION OF PHYSIOLOGICAL PERFORMANCE OF LENTIL GENOTYPES IN ORGANIC SITUATION UNDER DEFERRED DATES OF SOWING IN RICE FALLOW LAND
    (AAU, Jorhat, 2017-01) Sarmah, Bhargob; Kalita, Prakash
    An investigation was carried out during November, 2016 to March, 2017 in the Instructional-cum-Research (ICR) farm and Department of Crop Physiology, Assam Agricultural University, Jorhat-13, to evaluate the physiological performance of lentil genotypes in organic situation under deferred dates of sowing in rice fallow land. Five lentil genotypes namely HUL-57, SLC-102, PL-406, KLS-218 and SLC- 101were used for the study. There were three dates of sowing viz. 15th November, 30th November and 15th December. The land used for raising the crop has been maintained for last ten years as organic plot and has been used for raising winter rice crop. The lentil crops raised were supplied with nutrients through organic inputs (well rotten cow dung and enriched compost) and the chemicals used for plant protection were also organic. Significant variations were recorded among the genotypes in terms of various parameters namely total leaf chlorophyll content, relative leaf water content, in- vivo leaf nitrate reductase activity, root: shoot ratio, dry matter partitioning, number of pod per plant, number of seeds per pod, grain yield and harvest index .These parameters exhibited a decreasing trend with delay in the date of sowing from the recommended one. However lipid peroxidase activity was found to increase due to delay in sowing of lentil genotypes. Among the genotypes the HUL-57 performed the best compared to the other genotypes under both the situations when sowing was done at recommended date of sowing and when the sowing was delayed. On the other hand the genotype SLC-101 registered the lowest performance. The genotype HUL-57 exhibited the lowest percent reduction in terms of total leaf chlorophyll content, relative leaf water content, in- vivo leaf nitrate reductase activity, root: shoot ratio, dry matter partitioning, number of pod per plant, number of seeds per pod, grain yield etc. followed by the genotype KLS-218. When the sowing was delayed by 15 days (30th November) on an average biomass and grain yield were decreased by 12.29% and 3.30% respectively, whereas the corresponding decreases were 35.49% and 13.53% when biomass and grain yield from 15th December sowing were compared with that of 15th November sowing. In case of HUL-57 the decrease in biomass and grain yield were only 33.97% and 12.11% respectively when performance under 15th December sowing were compared with that of 15th November sowing. The better performance of HUL-57 could be attributed to better performance of this genotype in terms of the parameters namely total chlorophyll content, relative leaf water content, in- vivo leaf nitrate reductase activity, root: shoot ratio, dry matter partitioning, number of pod per plant, number of seeds per pod etc. As with the delay in sowing resulted in the exposure of the lentil plants to moisture shortage coinciding with the vegetative and early reproductive stages, the genotype HUL-57 can be labeled as moisture shortage tolerant genotype; more over this genotype can be said to have adjusted efficiently under the decreasing length of photo period as encountered when sowing was delayed.