Vol. 11, Issue 9 (2022)

Author(s):
Rakesh Sonawane, Jitendra Dhemre, Hemant Patil and Rajendra Birade

Abstract:
The field experiment was conducted three years to study the effect of silicic acid foliar application for management of purple blotch of onion in factorial randomized block design with two factors and three replications and treatments consisted of 2 seedling root dipping treatment @ 2.0 ml/l and other with tap water and five treatments of silicic acid sprays at 20, 40 and 60 days after transplanting i.e. silicic acid sprays @ 1.5 ml/L, 2.0 ml/l, 2.5 ml/l and 4 foliar sprays of Azoxystrobin @ 0.01% and control treatment. The seedling root dipping with silicic acid @ 2.0 ml/l recorded minimum percent disease index (22.58%) which was followed by seedling root dipping with tap water (23.82%). The spraying of Azoxystrobin @ 1.0 ml/l recorded minimum purple blotch disease of onion (17.99% PDI) which was at par with spraying of silicic acid @ 2.5 ml/l and @ 2.0 ml/l. In the Interaction, the seedling root dipping + Azoxystrobin @ 1.0 ml/l recorded minimum percent disease index (PDI 17.12%) which was at par spraying of silicic acid @ 2.5 ml/l and 2.0 ml/l. The seedling root dipping with silicic acid @ 2.0 ml/l recorded maximum marketable yield significantly increase in onion yield (118.46 q/ha) than without seedling root dipping treatment. Among the silicic acid spraying treatments, it is observed that the spraying of Azoxystrobin @ 1.0 ml/l recorded maximum marketable yield (128.32 q/ha) which was followed by spraying of silicic acid @ 2.5 ml/l and @ 2.0 ml/l. Interaction effect of application of seedling root dipping with silicic acid @ 2.5 ml/l in combination with Azoxystrobin @ 0.1% recorded significantly higher yield bulb followed by seedling root dipping treatments @ 2.0 ml /l and spraying of silicic acid @ 2.5 ml/l and 2.0 ml/l.