Studies on nutritional management of greening affected Kinnow mandarin plants
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Date
2022
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation was carried out at Dr J C Bakhshi, Regional Research Station, Abohar during the year 2020-21. It was aimed to investigate the influence of spraying zinc and manganese solutions on 13-year-old Kinnow mandarin plants that were affected by the greening disease. The experimental design was a randomized block with 3 plants per treatment (nutrition) subdivided into replicates. Different treatments of varying doses of zinc and manganese alone or in combination were applied. First spray was scheduled for mid august and second dose wherever required (as per treatments) was given during September. Fruits were harvested at maturity and analysed in the laboratory for various quality and physic-chemical parameters in PG, Nutrition Laboratories of Department of Fruit Science, Punjab Agricultural University, Ludhiana, Punjab. In general, it was observed that double sprays of zinc and manganese alone or in combinations were superior over single sprays. In particular, zinc sprays were found to be superior over manganese sprays. However, zinc and manganese together gave a synergistic effect and proved to be better than individual sprays of nutrients. The results indicated that application of zinc and manganese in combination [Zn (0.5%) + Mn (0.5%) (Two Sprays)] gave maximum increment in plant height (15.82 cm), spread and volume (5.26 cubic m) along with highest number of fruits (681.7) and fruit yield (112.71 q/acre). While, treatment T12 [Zn (0.5%) + Mn (0.3%) (Two Sprays)] recorded maximum fruit size, weight (150.7 g) and volume with highest fruit TSS (10.30 oBrix), TSS/ acidity ratio (12.26), pH (4.35), total sugars (6.32%), ascorbic acid (25.1 mg/100ml juice) and phenol content (32.2 mg GAE/g DW) along with minimum acidity (0.84%), showing at par results with treatment T14 [Zn (0.5%) + Mn (0.5%) (Two Sprays)] and the lowest values of these parameters were recorded with control treatment. Whereas, maximum juice percent (50.0%) and minimum peel (24.0%) and rag (26.0%) percent along with peel thickness (1.98 mm) were recorded with treatment T4 [Zn (0.5%) (Two Sprays)].
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Kudrat Preet Kaur (2022). Studies on nutritional management of greening affected Kinnow mandarin plants (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.