Effect of NAA and Ethrel on flowering and fruit characteristics of Ananas comosus (L.) Merr. var. Queen
| dc.contributor.advisor | Jha, K.K. | |
| dc.contributor.author | Kumari, Usha | |
| dc.date.accessioned | 2022-05-07T07:30:01Z | |
| dc.date.available | 2022-05-07T07:30:01Z | |
| dc.date.issued | 2020 | |
| dc.description | Effect of NAA and Ethrel on flowering and fruit characteristics of Ananas comosus (L.) Merr. var. Queen | en_US |
| dc.description.abstract | Pineapple (Ananas comosus (L.) Merr.) is an important monocotyledonous fruit plant produces the only edible fruit in plants of the family Bromeliaceae and is one of the most important commercial fruits of the world. Flowering is one of the most important processes in plant ontogeny, consisting of the transition from vegetative growth to generative development that ultimately allows reproduction. Onset of flowering in pineapples is marked by the appearance of a small red inflorescence in the centre of the plant rosette and vibrant red coloration in the base of the youngest (smallest and located around the central meristem) leaves. A major limitation that affects pineapple growers is the phenomenon of natural flowering. Natural flowering of pineapple is a serious problem because it disrupts fruiting schedules, decreases harvesting efficiency, increases costs and may reduce the percentage of marketable fruit. In order to avoid uneven natural flowering, forcing of pineapple is commonly done with NAA, ethylene, ethylene-releasing compounds such as ethephon, and CaC2 or acetylene when the plants are of sufficient size. Forcing synchronizes flowering and produces a sharp ripening peak. Forcing efficiency will be high when forcing is done during the period when natural induction normally occurs. The present investigation entitled “Effect of NAA and Ethrel on flowering and fruit characteristics of Ananas comosus (L.) Merr. var. Queen ” was conducted during 2017-2019 and 2018-2020 at the Agri – technology park , Birsa Agricultural University, Kanke, Ranchi. The experiments were laid out following factorial Randomized block design with three replications. In this way, the experiments were comprising of total thirty six combinations of twelve growth regulators and their combinations namely, NAA 10ppm (G1), NAA 20ppm (G2), Ethrel 10ppm (G3), Ethrel 30ppm (G4), Ethrel 50ppm (G5), NAA 10ppm + Ethrel 10ppm (G6), NAA 10ppm + Ethrel 30ppm (G7), NAA 10ppm + Ethrel 50ppm (G8), NAA 20ppm + Ethrel 10ppm (G9), NAA 20ppm + Ethrel 30ppm (G10), NAA 20ppm + Ethrel 50ppm (G11) and Control (G12) and three stages of spray i.e. 30 leaves stage (S1), 35 leaves stage (S2) and 40 leaves stage (S3). The results revealed that all the treatments and their combinations had significantly influenced flowering and fruit characteristics of pineapple. Among the different growth regulators and their combinations used in the study, NAA 10ppm (G1) was found superior to enhance fruit length(11.89cm), fruit girth (27.90cm), fruit weight(833.45g), fruit volume (562.15cc), crown length (25.88cm), crown width (30.70cm) and crown weight (193.17g) which ultimately gave maximum fruit yield (60.01t/ha). Ethrel 30ppm (G4) showed maximum flowering percent (87.31%), minimum days taken for flowering (34.44Days), days for completion of flowering (38.17 Days) and days taken for fruit maturity (141.06Days). NAA 10ppm + Ethrel 30ppm (G7) was found to have better chemical characteristics of fruits with TSS (18.25OBrix), Acidity (0.97%), TSS/Acid ratio (24.69), Reducing sugar (6.47%), Total sugar (10.92 %), phenol content (35.54mg/100g) and β-Carotene content ( 2.79 mg/100g). In case of stage of spray, 40 leaves stage was found to be significantly superior with respect to reproductive growth, yield and quality of fruits. Significantly minimum days to flowering (36.43 Days), days to completion of flowering (39.35 Days) and days to fruit maturity (138.58 Days) were recorded in 40 leaves stage. The maximum values for flowering percent (85.27%), fruit length (11.74cm), fruit girth (27.73cm), fruit weight (835.66g), fruit volume (543.60cc), crown length (23.03cm),crown width(30.37cm),crown weight(193.76g),pulp weight(291.35g),core weight(39.27g),pulp: peel ratio (2.44),pulp :core ratio (15.25), fruit yield (58.80t/ha) were also observed with 40 leaves stage. Spray of growth regulators at 40 leaves stage exhibited maximum values for TSS (16.39OBrix), TSS/Acid ratio (23.72), Ascorbic acid (39.06mg/100g), Reducing sugar (6.48%), Total sugar (10.79%), phenol content (36.75mg/100g), β-Carotene content (2.72mg/100g) and minimum titratable acidity (1.06%).The maximum B:C ratio was observed for the treatment NAA 10ppm at 40 leaves stage (3.00). Therefore, it is recommended that pineapple plants should be sprayed with growth regulators at 40 leaves stage for sustaining higher fruit yield and quality of pineapple fruit. Whereas, on the basis of benefit cost ratio, it could be recommended that pineapple plants should be sprayed with NAA 10 ppm at 40 leaves stage for attaining the maximum production of pineapple fruit. | en_US |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810184437 | |
| dc.keywords | Effect of NAA and Ethrel on flowering and fruit characteristics of Ananas comosus (L.) Merr. var. Queen | en_US |
| dc.language.iso | English | en_US |
| dc.pages | 163 | en_US |
| dc.publisher | Birsa Agricultural University, Ranchi | en_US |
| dc.sub | Horticulture | en_US |
| dc.theme | Effect of NAA and Ethrel on flowering and fruit characteristics of Ananas comosus (L.) Merr. var. Queen | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | Effect of NAA and Ethrel on flowering and fruit characteristics of Ananas comosus (L.) Merr. var. Queen | en_US |
| dc.type | Thesis | en_US |