Studies on Integrated Nutrient Management and Scheduling of Drip Irrigation in Onion (Allium cepa L.) cv. Telagi Red
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Date
2010
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UAS Dharwad
Abstract
The investigations on integrated nutrient management and scheduling of drip
irrigation in onion were carried out at Regional Agricultural Research Station,
Bijapur, Karnataka on medium deep black soil during 2004-05 rabi and 2005
summer. In integrated nutrient management (INM) experiment, there were 20
treatments involving three inorganic fertilizer levels and six organic manure levels
with two controls (RPP and absolute control). The experiment on scheduling of drip
irrigation included three irrigation intervals and three irrigation levels with flood
irrigation as control. The experiments were laid out in a split-plot design with three
replications each.
The results of INM experiment indicated that, higher levels of inorganics i.e.
162:32:148 kg NPK ha-1 (41.55 t ha-1) and 81:16:74 kg NPK ha-1 (41.09 t ha-1) as well
as higher levels of organic manures i.e. FYM at 30 t (40.56 t/ha), vermicompost at 6 t
(41.65 t/ha) and poultry manure at 3 t (40.88 t/ha) per ha recorded higher bulb yield
individually. The similar trend was observed in growth and yield parameters along
with net returns and B:C ratio. The physiological loss in weight, sprout and rot per
cent were significantly lower with no inorganics and higher levels of organics at
different storage periods.
In the experiment on scheduling of drip irrigation, one and two days intervals
of irrigation with 100 per cent PE recorded significantly higher growth, yield
parameters, bulb yield, net returns and B:C ratio over other interactions. Compared to
flood irrigation, one or two days intervals with 100 per cent PE and two days interval
with 80 per cent PE were significantly superior. All the irrigation intervals, levels and
their combinations recorded significantly higher WUE compared to flood irrigation.