INFLUENCE OF LIQUID PLANT GROWTH PROMOTING RHIZOMICROBIAL CONSORTIA ON QUALITY ROOTSTOCKS AND GRAFT SUCCESS IN MANGO (Mangifera indica L.)

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Date
2023-12-16
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College of Horticulture, Mudigere, Keladi Shivappa Nayaka University of Agricultural and Horticultural Sciences, Shivamogga
Abstract
An experiment was undertaken at the College of Horticulture, Hiriyur during 2022-2023. The experiment consisted of eight treatments with three replications which were laid out in a completely randomized design under the polyhouse condition, comprising eight treatments viz., T1 (Control), T2 (Azotobacter chroococcum), T3 (Bacillus megaterium), T4 (Frateuria aurantia), T5 (Azotobacter chroococcum + Bacillus megaterium), T6 (Azotobacter chroococcum + Frateuria aurantia), T7 (Azotobacter chroococcum + Bacillus megaterium + Frateuria aurantia) applied at 4 ml per each plant at the time of transplanting and VAM 10 g per plant was applied in common to all the treatments. Among different treatments studied, the rootstocks inoculated with Azotobacter chroococcum + Bacillus megaterium + Frateuria aurantia (T8) recorded maximum plant height (36.50 cm), stem girth (9.03 mm), number of leaves (17.39), leaf length (17.36 cm), leaf breadth (4.59 cm), leaf area (1006.26 cm2), leaf area index (4.33), fresh weight of shoot (42.46 g/plant), dry weight of shoot (11.51 g/plant), total dry matter production (18.95 g/plant), root length (22.93 cm), root thickness (8.50 mm), fresh weight of root (15.93 g/plant), dry weight of root (7.44 g/plant), root volume (14.67 ml), total chlorophyll content (2.49 mg/g of fresh weight) and total sugar (5.14 %) 120 days after transplanting. Similarly, maximum available nitrogen (232.86 kg/ha), available phosphorous (71.11 kg/ha), available potassium (210.07 kg/ha) in the media, total nitrogen (3.50 %), total phosphorous (0.73 %) and total potassium (3.26 %) in the plants was recorded by T8 (Azotobacter chroococcum + Bacillus megaterium + Frateuria aurantia) at 120 days after transplanting. In grafted plants, the maximum sprout success (84.44 %) at 60 days after grafting, survival percentage (84.55), sprout length (9.30 cm), sprout girth (4.76 mm), number of leaves (15.37), leaf length (14.08 cm) and leaf breadth (3.29 cm) at 120 days after grafting recorded by Azotobacter chroococum + Bacillus megaterium + Frateuria aurantia (T8). The combined use of liquid PGPRs ascertained the better establishment of mango rootstocks and graft success.
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