EFFECT OF NANO NITROGEN FOLIAR SPRAY ON GROWTH AND YIELD OF TREE MULBERRY AND COCOON PRODUCTION
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Date
2022-02-04
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Abstract
A study on “Effect of nano nitrogen foliar spray on growth and yield of tree mulberry and cocoon production” was conducted in the established V-1 tree mulberry garden at KVK, Hassan during 2020-21. On 45th days after pruning (Days after pruning), significantly higher number of shoots per tree (46.83), number of leaves per tree (658.45) and leaf area (168.05 cm) were recorded in tree mulberry raised with foliar application of nano nitrogen at 4 ml L-1 on 25th and 35th DAP+60 % N through soil application. The leaf
yield (6340.52 g/tree on 60th DAP), leaf moisture (77.56 %), total chlorophyll (2.54mg/g),
leaf elemental except nitrogen and biochemical compositions at 45th DAP were highest in foliar spray of nano nitrogen at 4 ml L-1 on 25th and 35th DAP+60 % N through soil
application. However, significantly shorter fifth instar duration (7.29 days), higher fifth
instar larval weight (54.69 g/10 larvae), ERR (97.33 %), single cocoon weight (2.58 g),
single cocoon shell weight (0.58 g), cocoon shell ratio (22.55 %), filament length (1435.44m) and filament weight (0.51 g) were recorded in treatment with foliar application of nano nitrogen at 4 ml L-1 on 25th and 35th DAP+60 % N through soil application. Net returns per hectare of tree mulberry (Rs. 1,63,340 ha/crop) and B:C ratio (3.17) were more with foliar application of nano nitrogen at 4 ml L-1 on 25th and 35th DAP+60 % N through soil application and found to be cost effective as compared to other treatments.
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