Effect of fertility levels and jeevamrut application on growth and yield of onion (Allium cepa L.)

Abstract

The investigation was carried out during Rabi season of 2022-23 and 2023-24 at College Farm, College
of Horticulture, S. D. Agricultural University, Jagudan. The treatments comprised of three fertility levels and
seven levels of jeevamrut application having total 21 number of treatment combinations. Standard package of
practices were followed during entire period of experimentation. The experiment was laid out in a randomized
block design (factorial) with three replications. The results showed that the maximum plant height (56.39 cm)
at 75 DAT & (90.66 cm) at harvest, number of leaves at 75 days after transplanting (DAT) (7.58) & at harvest
(11.04), weight of bulb (85.13 g), yield per plot (5.25 kg), marketable bulb yield (347.95 q/ha), total yield (350.45
q/ha) and equatorial diameter of bulb (5.89 cm) were recorded in F1 (100% RDF) which was at par with F2 (80%
RDF). Minimum unmarketable bulb yield (2.13 q/ha) was recorded with the application of 60 per cent RDF (F3).
Among jeevamrut application, J6 (basal application of ghan jeevamrut 750 kg/ha + spray of jeevamrut @ 5%)
gave maximum weight of bulb (94.99 g), yield per plot (5.64 kg), marketable bulb yield (380.68 q/ha), total yield
(383.30 q/ha) and equatorial diameter of bulb (5.91 cm). Minimum unmarketable bulb (2.19 q/ha) yield was
obtained under treatment J4 (spray of jeevamrut @ 5%). Interaction effect between fertility levels and jeevamrut
application the maximum plant height (64.57 cm) at 75 DAT was recorded in the treatment combination F2J6
(80% RDF + basal application of ghan jeevamrut 750 kg/ha + spray of jeevamrut @ 5%). Minimum unmarketable
bulb yield (1.94 q/ha) was noted in the treatment combination F3J7 (60% RDF+drenching of jeevamrut @ 10%
+spray of jeevamrut @5%). It can be concluded that maximum yield/ha was noted in the treatment receiving
80 per cent RDF (80, 40, 40 kg/ha NPK, respectively) + basal application of jeevamrut @ 750 kg/ha + spray of
jeevamrut @ 5% i.e. treatment combination F2J6.