EFFECT OF GROWTH REGULATORS, MACRONUTRIENTS, BIOFERTILIZERS AND MEDIA ON SEEDLING GROWTH OF PUMMELO (Citrus maxima Merill)
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Date
2017-07
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Publisher
University of Horticultural Sciences, Bagalkot. (College of Horticulture, Bengaluru).
Abstract
The experiment entitled “Effect of growth regulators, macronutrients, biofertilizers and
media on seedling growth of pummelo (Citrus maxima Merill)” was conducted at RHREC, UHS
campus, Bengaluru during 2016-2017. Two set of experiments on seedling growth were
conducted, one with foliar spray of growth regulators and macronutrients, and second experiment
was with biofertilizers and media. The Seedling height (49.30 cm), seedling diameter (0.64 cm),
number of leaves (42.90), leaf area (32.53 cm2
), fresh and dry weight of seedlings (48.67 and
12.87 g) and root parameters were found highest in foliar spray of GA3 150 ppm + NAA 150
ppm and minimum was in water spray. The seedlings raised in potting mixture of Red earth:
FYM: Cocopeat (2:1:1) + Biomix (Azotobacter + PSB + Pseudomonas + VAM) 5 g each have
recorded the highest germination percentage (78.47 %) and maximum vigour indexes I and II
(7004.44 and 790.42) and minimum was in Red earth: Poultry manure (2:1). The seedling height
(45.09 cm), seedling diameter (0.57 cm), number of leaves (36.53), leaf area (30.52 cm2
), fresh
and dry weight of seedlings (35.23 and 10.10 g) and root parameters were found maximum in
Red earth: FYM: Cocopeat + Biomix and was minimum in Red earth: FYM: Sand (1:1:1). Red
earth: FYM (2:1) recorded highest (1.26:1) B:C ratio and least was in Red earth: Vermicompost
+ Biomix (0.35:1). The microbial population of Azotobacter, Phosphate solubilizing bacteria and
Pseudomonas were maximum in the treatment Red earth: FYM: Cocopeat + Biomix followed by
Red earth: Poultry manure (2:1) and Red earth: FYM: Cocopeat (2:1:1) respectively. One
hundred percent Vesicular-Arbuscular Mycorrhiza colonization was found in Red earth: FYM:
Sand + Biomix, Red earth: FYM + Biomix, Red earth: Vermicompost + Biomix, Red earth:
Poultry manure + Biomix and Red earth: FYM: Cocopeat + Biomix.