EFFECT OF AZOTOBACTER AND PHOSPHORUS SOLUBILIZING BACTERIA ON GROWTH AND YIELD OF OKRA(Abelmoschus esculentus)
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Date
2018
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
The present investigation was conducted in green house of Department of Agricultural Microbiology, College of Agriculture, IGKV, Raipur during 2017-18 with the objective to see the effect of microbial inoculants on okra, Variety- Suraksha. The experiment was laid out in complete randomized design with six treatments and four replications. Treatments consisting of T1(100% NPK), T2 (100% NPK+Vermicompost), T3 (75% NPK+Vermicompost+PSB), T4 (75% NPK+Vermicompost+Azotobacter), T5 (75% NPK+Vermicompost+Azotobacter+PSB), T6 (50% NPK+Vermicompost+Azotobacter+PSB).The study involved Azotobacterand PSB inoculation where Azotobacter isolate in Jensen’s medium produced white translucent, nearly round , convex and gummy colonies while PSB isolated on Pikovskaya′s agar media produced creamy to yellowish round with entire margin and, showing moderate clear zone surrounding the colony growth . Both the isolates showed positive reaction for starch hydrolysis, catalase test. TSI test showed glucose, lactose and sucrose fermentation occurred with Azotobacterwhereas in PSBno fermentation was seen .
The results showed that the application of Azotobacter + PSB along with vermicompost and 75 % NPK produced highest and significantly both growth attributes viz. plant height at 30, 60 DAS and at harvest, number of leaves per plant, chlorophyll content and yield and yield attributes like (Number of fruits per plant, fruit length, fruit weight, fruit yield plant-1) as compared to other treatments but remained at par withAzotobacter + PSB along with vermicompost and 50% NPK. Both the treatments showed superior effect on okra over rest of the treatments. Similarly, results also showed that application of vermicompost (T2) significantly increased the growth and yield parameters as compared to only inorganic treatment (T1). The significantly highest yield (537.34 g and 518.58) were recorded in treatment T5 and T6 which proved the best treatment combination in terms of fruit yield per plant(210.87g and 198.83g) total fruits yield in comparison to other treatment combinations.
From the present investigation and with the cost–effective point of view it can be inferred that an application of 50% NPK + vermicompost + Azotobacter + PSB observed to be beneficial in enhancing vegetative growth and increasing yield of okra.
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