STUDIES ON CHILL UNITS REQUIREMENT IN APPLE (Malus × domestica BORKH.)

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dc.contributor.advisorCHAUHAN, P.S.
dc.contributor.authorBABITA
dc.date.accessioned2016-06-04T10:46:44Z
dc.date.available2016-06-04T10:46:44Z
dc.date.issued2015
dc.description.abstractABSTRACT The present investigations entitled “Studies on chill units requirement in apple (Malus X Domestica Borkh.)” were conducted in the experimental orchard of the Regional Horticulture Research and Training Station Mashobra, Shimla and in a private apple orchard in Aisha, Tehsil Sunni, Shimla District, during the year 2013 and 2014. The field experiment was laid out in randomized block design and replicated thrice. In experiment-1 the effective chill units (CU) and GDH°C requirements of apple at Mashobra, Shimla located 31.1°N with an elevation of 2286 m were estimated by adopting North Carolina model with base temperature (4.5°C) and (6.1°C). The estimated CU and GDH°C were 1220 and 8244 with base temperature (4.5°C), while using base temperature (6.1°C) estimated CU and GDH°C were 1222 and 5385 respectively. In experiment-2 the estimated CU and GDH°C were tested and compared with models. Using CU and GDH°C constants of all models to calculate full bloom dates of six years i.e. 2008-2014 at three locations of different elevations and compared with actual full bloom dates for different years. The difference of days of proposed models was compared with difference of days of other chill unit models. At Mashobra (2286m amsl) Shimla and Kotkhai (1815m amsl) location North Carolina (Proposed Model with base temperature 4.5°C) recorded minimum difference of two and five days, respectively. However, at Seobag (1330m amsl) Kullu location North Carolina model (base temperature 6.1°C) was found more accurate. In the experiment-3 the chilling requirement of five apple cultivars were estimated under control condition. Among all Red Fuji recorded the maximum (66.4%) and Golden Delicious recorded minimum (41%) bud burst. Red Fuji completed chilling requirement after completing 1100 CU. Cultivar, Scarlet Gala and Red Chief met the chilling requirement in between 1100 CU to 1200 CU, whereas, Starking Delicious and Golden Delicious met their chilling requirement in between 1200 CU and 1300 CU. In the experiment-4 the Starking Delicious apple trees were treated with different treatment combination of Dormex and HMO. The T5 (Dormex @ 1.0% + 2.0% HMO) was found to be the most effective in improving per cent flowering, reducing duration of flowering, increasing fruit set, improving fruit retention and enhancing maturity. However, T6 (Dormex @ 1.5% + 2.0% HMO) was significantly at par in all the parameters. The studies indicate that Dormex @ 1.0% + 2.0% HMO may be helpful improving per cent flowering, reducing duration of flowering, increased fruit set, improved fruit retention and enhanced maturity.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/66762
dc.language.isoenen_US
dc.subHorticulture
dc.subjectfruits, developmental stages, budding, apples, dormancy, organic compounds, purification, peaches, planting, setsen_US
dc.subjectAPPLE (Malus × domestica BORKH.)en_US
dc.these.typePh.D
dc.titleSTUDIES ON CHILL UNITS REQUIREMENT IN APPLE (Malus × domestica BORKH.)en_US
dc.typeThesisen_US
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