EFFECT OF SULPHUR, ZINC, BIOINOCULANT (VAM) AND BIOFORMULATIONS ON GROWTH, YIELD AND QUALITY OF ONION (Allium cepa L.) VAR. ARKA KALYAN
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Date
2019-03-11
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K.R.C COLLEGE OF HORTICULTURE, ARABHAVI (UNIVERSITY OF HORTICULTURAL SCIENCES, BAGALKOT)
Abstract
Effect of sulphur, zinc, bioinoculant (VAM) and bioformulations on growth, yield and quality of onion (Allium cepa L.) var. Arka Kalyan was carried out during Kharif 2015 and Kharif 2016 at Kittur Rani Channamma College of Horticulture, Arabhavi, Karnataka. Field trial was conducted on onion var. Arka Kalyan to assess the influence of sulphur and zinc combination with factorial RBD design, replicated thrice involving four levels of sulphur (0, 20, 30 and 40 kg S/ha) and four levels of zinc (0, 5, 10 and 15 kg Zn/ha) comprising sixteen treatment combinations of sulphur and zinc including control (S0Z0). Significantly higher bulb yield was recorded in S3 (21.70, 21.90 and 21.80 t ha-1) and Z3 (21.03, 21.30 and 21.17 t ha-1) during 2015, 2016 and in pooled data, respectively. With respect to the interaction effects, the combination of treatment S3Z3 which received RDF + 40 kg S/ha + 15 kg Zn/ha registered significantly maximum bulb yield (23.22, 24.51 and 23.87 t ha-1) during 2015, 2016 and in pooled data, respectively.
A separate field trial on the effect of bioinoculant (VAM) and bioformulations was laid out in randomized block design with nine treatments, replicated thrice. Significantly higher bulb yield (23.82, 26.08 and 24.95 t ha-1) and lower per cent disease index at 90 DAT (21.17, 20.05 and 20.61) and at harvest (20.45, 20.02 and 20.24) were recorded by the treatment T9 during 2015, 2016 and in pooled data, respectively. Among nine treatments, the highest root parameters viz., root colonization and number of chlamydospores per 50 g of soil was recorded in the treatment T9, which received RDF + Azospirillum brasilense + Azotobacter chrococcum + VAM (1 kg m-2 of nursery bed) + PSB (Pseudomonas striata) + Trichoderma harzianum (2.5%). Quality parameters like TSS (14.05, 13.92 and 13.99 °Brix) and sulphur content (0.381, 0.407 and 0.394 %) were also found higher in T9 during 2015, 2016 and in pooled data, respectively.
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