EFFECT OF HUMIC ACID AND BIO-INOCULANTS ON CROPPING BEHAVIOUR OF GUAVA (Psidium guajava L.) UNDER MEADOW PLANTATION
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Date
2019-08
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UHF,NAUNI
Abstract
ABSTRACT
The present investigation was carried out in Regional Horticultural Research and Training
Station of Dr. YS Parmar University of Horticulture and Forestry at Dhaulakuan, Sirmour, Himachal
Pradesh during two consecutive seasons of 2017-18 (rainy) and 2018-19 (winter). The experiment
was conducted on guava cv. Lalit, spaced at 2 m x 1.5 m under meadow plantation. Foliar application
of humic acid at 30 and 60 ml/L at bud burst to flowering stage and bio-inoculants (Phosphorus
solubilizing bacteria (PSB) + Azotobacter chroococcum at 10 ml/plant each, and PGPR at 25 ml/plant
+ AM fungi at 25 g/plant) in rhizosphere along with two levels of RDF-NPK at 90 and 80 per cent of
RDF was carried out. The experiment was laid out in Randomized Block Design with eight treatment
combinations, replicated thrice along with a control. The results inferred that application of humic
acid at 60 ml/L along with each of PSB and A. chroococcum at 10 ml/plant along with 80 per cent of
RDF-NPK resulted in growth increment of plant height as 14.28 and 11.41% during rainy and winter
season, respectively over control. This superior combination also recorded significant increase in per
cent fruit set with reduced fruit drop. Fruit yield was 2.5 (rainy) and 4.2 times (winter) higher over
control. Fruit quality traits viz., fruit dimension, fruit weight, total soluble solids (TSS), acidity,
TSS:acid, total sugars and ascorbic acid content were also significantly affected by this conjoint
application. Microbial biomass of actinomycetes, A. chroococcum, PSB and AM fungi were improved
by 2.0, 3.5, 4.0 and 4.5 times, respectively during rainy season and 2.5, 4, 5.5 and 3.5 times in winter
season over control. This superior combination also exhibited considerably greater amounts of leaf N
(2.55 and 2.67%), P (0.24 and 0.30%) and K (1.32 and 1.43%), during rainy and winter seasons in
guava under meadow plantation.
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