Agronomic management for enhancing yield and quality of stevia (Stevia rebaudiana Bertoni) (Record no. 290685)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04509nam a22001817a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 630 |
| Item number | JUN/AG PG |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Junaidath P |
| 245 ## - TITLE STATEMENT | |
| Title | Agronomic management for enhancing yield and quality of stevia (Stevia rebaudiana Bertoni) |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Vellanikkara |
| Name of publisher, distributor, etc | Department of Agronomy, College of Agriculture |
| Date of publication, distribution, etc | 2023 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | xvi, 71p. |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | MSc |
| 520 3# - SUMMARY, ETC. | |
| Abstract | Stevia rebaudiana is an alternative sugar crop that is becoming popular in various parts of the world. It belongs to the sunflower family, Asteraceae, and is native to Paraguay (South America); hence called Paraguay’s sweet herb. Being a natural sweetener it is also known as sweet leaf, honey yerba, honey leaf, meeti tulsi, sweet chrysanthemum, and candy leaf. The plant contains steviol glycosides (SVglys), which has importance in the human diet as a low-calorie and high-potency sweetener. In addition to sweetening properties, Stevia rebaudiana also has anti-hyperglycemic, anti-cancer, hepatoprotective, anti-hypertensive, anti-caries, antioxidant, and anti-bacterial properties. Since the fresh herbage is the main economic part of stevia, production of more leaf biomass with higher steviol glycosides is the main criterion for crop performance. The present study entitled “Agronomic management for enhancing yield and quality of stevia (Stevia rebaudiana Bertoni)” was conducted at the Department of Agronomy, College of Agriculture, Vellanikkara, Thrissur during September 2021 to May 2022. The objective of the study was to standardize proper spacing and pinching time for stevia. A field experiment was conducted in Factorial Randomized Block Design (FRBD) with three replications. The treatments consisted of three spacing levels viz., 15 cm × 10 cm, 20 cm × 10 cm, and 15 cm × 15 cm, and four pinching intervals viz., pinching at 20 days after planting (DAP), pinching at 30 DAP, pinching at flower bud initiation and no pinching (control). Both spacing and pinching significantly influenced growth parameters such as plant height, number of branches and leaves, fresh and dry leaf yield, per plant herbage yield, and total herbage yield. Taller plants were seen with closer spacing (15 cm × 15 cm) throughout the crop growth period. Though the growth parameters were higher at a spacing of 15 cm × 10 cm at early growth stages of stevia (20 DAP), in subsequent stages, these were higher in wider spacing of 15 cm × 15 cm. Closer spacing resulted in the highest total herbage yield at harvest (10925 kg ha-1). Pinching is an important agronomic technique that helps to enhance vegetative growth. In general, yield related characteristics like the number of branches and leaves were found to be higher in pinched plants than in nonpinched plants. Plant height was significantly lower in the pinched plants compared to the unpinched plants. Plant height reduced drastically when pinching was performed during their early vegetative growth. At the flower bud initiation stage, a minimum plant height was seen in the plants where pinching was carried out at 20 DAP compared to pinching done at 30 DAP. One month after planting, 20 DAP-pinched plants had more branches and leaves, while at the beginning of the flower bud, 30 DAP-pinched plants had more. At the time of harvest, plants pinched at the beginning of the floral bud initiation produced the highest overall herbage yield, followed by plants that had received pinching at 30 DAP, no pinching, and pinching at 20 DAP, respectively. The interaction between spacing and pinching was also significant with respect to total herbage yield. Planting stevia at a spacing of 15 cm × 10 cm with pinching at the initiation of floral buds proved to be the best treatment concerning total herbage yield at harvest. Total glycoside content was unaffected by different plant spacings and pinching. However, significant variation was observed for total glycoside yield (kg ha-1) concerning spacing and pinching. It was higher in the stevia planted at a closer spacing of 15 cm × 10 cm, and received pinching at flower bud initiation The study suggests growing stevia at a closer spacing (15 cm × 10 cm) and pinching at the flower bud initiation stage for higher herbage and glycoside yield under Kerala conditions. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Agronomy |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Stevia |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Stevia rebaudiana Bertoni |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Sindhu, P V (Guide) |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Item type | Theses |
| Not for loan | Collection code | Permanent location | Current location | Shelving location | Date acquired | Full call number | Barcode | Date last seen | Koha item type |
|---|---|---|---|---|---|---|---|---|---|
| Not For Loan | Thesis | KAU Central Library, Thrissur | KAU Central Library, Thrissur | Theses | 2023-10-06 | 630 JUN/AG PG | 175812 | 2023-10-06 | Theses |