Studies on Organic Production Technology in Onion (Allium cepa L.) Cv. Bellary Red
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Date
2011
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UAS Dharwad
Abstract
Investigation on organic production technology in onion Cv. Bellary Red was
carried out at Agricultural Research Station, Hagari (UAS, Dharwad) during rabi
2006-07 and kharif 2007-08 to study the effect of organic and inorganic sources of
nutrients and planting geometry on production and keeping quality of onion and
influence of post-harvest treatment of different botanicals and bioagents to minimize
the storage loss of onion.
Among the different nutrient sources, application of RDF (125:50:125 NPK
kg ha-1) + FYM (30t ha-1) recorded significantly higher bulb yield (44.5t ha-1)
followed by 50% FYM (12.5t ha-1) + 50% vermicompost (2t ha-1) + biofertilizers
(Azospirillum and PSB @ 5kg ha-1 each) during rabi season . However, both the
treatments were at par with each other in kharif. The storage study indicated that loss
of bulbs were significantly minimum and marketable bulbs were maximum (58.23
and 45.41% during rabi and kharif seasons respectively) at the end of storage period
(4 months) with application of 50% FYM (12.5t ha-1) + 50% vermicompost (2t ha-1)+
biofertilizers (Azospirillum and PSB @ 5kg ha-1 each).
The planting geometry of 15 x 10 cm with FYM (12.5t ha-1) + vermicompost
(2t ha-1)+biofertilizers recorded significantly maximum bulb yield (38.56 and 34.72t
ha-1, respectively during rabi and kharif seasons) and marketable bulbs (49.28 and
43.67% during rabi and kharif season, respectively) at the end of storage period.
The post-harvest application of Trichoderma harzianum -0.5% with 50%
FYM (12.5t ha-1)+50% vermicompost (2t ha-1)+biofertilizers during crop growth
period resulted in better accumulation of TSS (%) and dry matter content in the bulbs,
maximum marketable bulbs and highest B:C ratio of 4.95 and 4.18 during rabi and
kharif season, respectively with minimum spoilage of bulbs after storage period.