National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Phenology is branch of science, which deals with timing of periodic occurrences particularly biological in nature with respect to biotic and abiotic factors and about their interrelationships. As for as guava fruit is concerned, different phenological stages are well defined but they also depend upon climatic conditions but amenable to managements through various cultural intrusions. Various stages are clearly identified but under the influence of environmental conditions. Generally there are sixteen stages are recorded during growing phase, starting from bud dormancy to fruit maturity or ripening. Various scholars concerning bud developments observed substantial differences. In this paper, information regarding various guava species are compiled, viz.in this paper, information regarding various guava species are compiled, viz. P. guineense, P. cattleianum, P. chinensis and cultivar Shweta, Sardar, Arka Kiran, Hisar Surkha, Snow White, Black guava, Lalit, Arka Amulya, Phenological stages from time of leaf flushing to duration of fruiting were considered. Shortest flowering period was recorded in Allahabad Safeda i.e. 33 or 38 days while longest flowering period was observed in Hisar Safeda i.e. 41 or 45 days in both spring and autumn season. The first-to-last-flowering duration is shortest in P.cattleianum (30 days) and longest in P. guineense (60 days) and this flowering duration lasts upto 65 days in Arka Kiran (65 days). P. chinensis (22 days) takes 22 days to achieve 50 percent flowering stage while P. guineense takes 28 days and Arka Kiran takes 30 days to achieve this stage. Anther dehiscence time is also varying from species to species it is 7.00 to 8.00 am in P. guineense, 8.00 to 10.00 am in P.chinensis. Pollen germination percentage is lowest in P. cattleianum 40.23% while it is highest in Arka Kiran 80.34%. P. cattleianum takes 12 days from flowering to fruit set while P. guineense 18 days.
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