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ThesisItem Open Access STUDIES ON PERFORMANCE OF CHRYSANTHEMUM cv. CHANDRIKA FOR EARLY INDUCTION OF FLOWERING UNDER POLYTUNNEL CONDITION(Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli., 2021-07-20) DHAWAN, SHWETA MACCHINDRA; Khandekar, R. G.; Salvi, B. R.; Dalvi, N. V.; Potphode, P. D.The present investigation entitled “Studies on performance of chrysanthemum cv. Chandrika for early induction of flowering under polytunnel condition” was carried out at Nursery number 10, College of Horticulture, Dapoli, Dist. Ratnagiri in rabi season during 2020-21. The experiment was laid out in Randomized Block Design with nine treatments replicated thrice. The treatments (interruption of light) applied were T1 (30 minutes), T2 (60 minutes), T3 (90 minutes), T4 (120 minutes), T5 (150 minutes), T6 (180 minutes), T7 (210 minutes), T8 (240 minutes) along with control-T9. Experiment was conducted as per the approved outline of research from October, 2020 to February, 2021. During the period of investigation, in the first experiment statistically significant difference was recorded on growth, flowering and yield of chrysanthemum plants as a result of various light interruption treatments applied. Among all the treatments, maximum plant height (75.11 cm), plant spread (38.64 cm), number of leaves (186.13), basal stem diameter of plant (7.57 mm), number of branches per plant (9.47, 18.73 and 23.95 primary, secondary and tertiary branches respectively), fresh and dry weight of plant (379.83 g/plant) and (128.80 g/plant), fresh and dry weight of root (16.16 g/root) and (11.30 g/root), fresh and dry weight of shoot (363.18 g/shoot) and (112.04 g/shoot), fresh and dry shoot: root ratio of plant (22.49 g) and (15.96 g), average leaf area (14.41 cm2), total leaf area (2094.49 cm2), leaf area index (5.22) were recorded in treatment T6 i.e., interruption of light/dark exposure for 180 minutes. Average illuminance of light from 17792.29 Ix to 26073.25 Ix which was non-significant due to uniform conditions inside polytunnel. Illuminance of light recorded during short days was comparatively low from 30 days after transplanting to 60 DAT i.e., from month of November till end of December while increase in illuminance of light was noted from 75 DAT to 120 DAT under long day conditions (14th January onwards) as vegetative vigour was enhanced till 30 DAT in chrysanthemum. While reproductive stage was induced from 45 DAT. In case of flowering maximum number of flower buds/plant (52.00), number of flower buds/plot (2525.83), number of flower buds/polytunnel (68197.50), duration of flowering (162.32), flower diameter (4.59 cm), length of stalk flower (9.13 cm) was recorded in treatment T6 with 180 minutes of light interruption. It was also observed that days for commencement of first flowering (62.53) and days to 50% flowering (103.90) were significantly recorded minimum with treatment T6 (180 minutes). While studying the effect of different treatments on yield performance for same treatment T6 (180 minutes) recorded significantly maximum number of flowers/ plant (31.93), number of flowers/ plot (1247.78), number of flowers/ polytunnel (38919.97), fresh weight of flowers/plant (81.92 g/plant), fresh weight of single flower (1.93 g/flower), dry weight of single flower (0.71 g/flower), fresh weight of one hundred flowers (193.60 g/flowers), yield per plant (315.20 g/plant), yield per plot (6.47 kg/plot), yield per polytunnel (105.90 kg/polytunnel) and yield per hectare (18.82 t/ha). Also, maximum B:C ratio (2.50) was recorded in the same treatment T6. In second experiment maximum shelf life 24.84 days was noticed in treatment T1 (2°C) among the various treatments. However, from the present investigation it proves that interruption of light for 180-minutes treatment was found promising for early induction of flowering and yield performance in the first experiment. In second experiment shelf life was extended by 24.84 days at 2°C temperature in chrysanthemum cv. Chandrika.ThesisItem Open Access BIOLOGICAL STUDIES OF BLOOD CLAM, Tegillarca (Anadara) rhombea (Born, 1778) ALONG RATNAGIRI COAST, MAHARASHTRA(DBSKKV., Dapoli, 2015-05) MESHRAM, ASAWARI MAHENDRAKUMAR; MOHITE, S.A.Present studies were carried out by collecting the blood clams T. (A.) rhombea from the estuarine areas of Ratnagiri. These blood clams are collected at low tides for local consumption and form a subsistence fishery here. The clams were collected mostly by hand picking with the help of the local clam collectors and by operating a hand dredge locally called as “kurund”. 4.1. Biology 4.1.1. Morphological relationship: Relationships between length, width, height, hinge length, total body weight, and wet weight were studied in total 1200 blood clams. The constants were determined from the morphological data. The relationships between length and width, length and height, length and hinge length, length and total weight, length and wet weight were calculated for the clams. The relationships were determined using the simple linear equations, where L is shell length, Ht shell height, Wd width, Hg hinge length, Wt total weight, Wwt wet weight and Dw dry weight. The regression analysis of the allometric data is presented by Table 4.1 and Fig. 4.1 to 4.6. Length - weight relationships of males and females of T. (A.) rhombea were also studied. Total 490 males, 520 females and 190 indeterminants were examined. In order to find out whether the regression coefficients differ from 3, student's ‘t’ test was applied (Table 4.2). The data was analyzed for the comparison of the regressions to test whether the correlation coefficients differ significantly or not. From the data analysed, it became clear that regressions of males and female differ significantly from each other. Therefore, a combined regression equation was derived for the males and females.
