INFLUENCE OF SULPHUR, ZINC AND BORON ON GROWTH, YIELD AND QUALITY OF ONION
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Date
2017-08
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UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT
Abstract
Onion is a heavy feeder of mineral nutrients and it removes a large amount of
nutrients from the soil. The standardization of optimum quantities of secondary
nutrients and micronutrients for onion production is very much essential.
Field experiment was carried out to study the response of onion to different
levels of sulphur S0 (0 kg/ha), S1 (15 kg/ha) and S2 (30kg/ha), zinc Z0 (0 kg/ha),
Z1 (2 kg/ha) and Z2 (4 kg/ha) and boron B0(0 kg/ha), B1 (1kg/ha) and B2(2kg/ha)
along with recommended dose of fertilizer. Totally 27 treatment combinations were
laid out in factorial randomized block design with two replications, conducted at
Olericulture unit of Kittur Rani Channamma College of horticulture, Belgaum district
(Karnataka), during kharif, 2016.
Marked differences among the treatments were noticed at different stages of
crop growth with respect to plant height, number of leaves, neck thickness and leaf
area per plant.
Plant height, number of leaves, neck thickness and leaf area per plant was
maximum at S2, Z2, and B2levels and interaction effect of S2Z2, S2B2 and Z2B2.
Maximum plant height (62.75cm), number of leaves (9.75) , neck thickness (2.49 cm)
and leaf area per plant (208.68 cm2) was recorded in S2Z2B2 interaction.
The data in respect of yield and yield contributing characters revealed
significant differences due to various treatments under study. Polar diameter and
equatorial diameter of onion bulb at harvest were highest at S2, Z2 B2, S2Z2, S2B2 and
Z2B2 interaction. Highest polar diameter (6.05cm) and equatorial diameter (6.33cm)
were recorded at S2Z2B2. Total and marketable yield of onion were highest at S2, Z2
and B2 levels and interaction effects of S2Z2, S2B2 and Z2 B2. Highest total and
marketable bulb yield (26.20t/ha) of onion (31.25t/ha) were recorded at S2Z2B2.
The minimum total loss was observed at S2, Z2 and B2 levels and interaction
effects of S2Z2, S2B2 and Z2B2. Minimum total loss (19.10%) was recorded at S2Z2B2
interactions. Uptake of nitrogen, phosphorous, potassium, sulphur, zinc and boron by
onion was highest at S2, Z2 and B2 levels and interaction effects of S2Z2, S2B2 and
Z2B2 interaction levels. Highest uptake of nitrogen (205.42 kg/ha), phosphorus (25.62
kg/ha), potassium (156.47 kg/ha), sulphur (52.35 kg/ha), zinc (257.22 gm/ha) and
boron (192.80 gm/ha) were recorded at S2Z2B2 interaction levels.
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