Abstract
Isabgol (Plantago ovata Forks.) is one of the important cash crops in arid and semi-arid regions of India. The husk of Isabgol seeds are primarily used as laxative in medicinal preparations. The cultivation of Isabgol crop is very much dependent on soils and weather conditions as this crop is highly susceptible to many biotic and abiotic stress parameters. Soil microbial population is involved in many direct and indirect interactions with crop plants. The type of microbes present in the soils also affects the plant health. Soil samples from the rhizospheric zone of the plants were collected from Barmer, Jalore and Ajmer Districts of Rajasthan State in western arid region of India. The soil EC and pH (1:2.5) recorded were in the range of 0.12 to 0.46 dS/m and 7.4 to 8.9, respectively, depicting neutral to alkaline soils, the macro nutrient viz; N, P, K were found to be in the range of 128.0 to 192.54, 19.4 to 80.4 and 149.8 to 338.8 kg/ha, respectively. The DTPA extractable micronutrients Cu, Zn, Mn and Fe were in the range of 0.29 to 3.50, 0.26 to 1.5, 0.51 to 4.51 and 1.0 to 5.38 ppm, respectively, in the soil samples of Isabgol growing regions of Rajasthan. Total viable count (TVC) gives a quantitative idea about the presence of microorganism such as bacteria and fungi in samples. The total bacterial count of soil microorganisms varied from 0.8x107 to 1.96x107 cfu/g whereas, total fungal count varied from 1.52x106 to 2.85x106 cfu/g. Beneficial microorganism population in terms of total Azotobacter count (0.1x105 to 1.0 x105 ) psuedomonads counts (3.33x105 to 5.8x105 cfu/g) and phosphate solubilizing bacterial count (0.1x103 to 1.0x103 cfu/g) varied highly in different soils. Key words: Isabgol (Plantago ovata Forks.), bacterial count, fungal count, N, P, K, macronutrients, micronutrients.
Highlights
Isabgol (Pla antago ovata a Forks.) is one o of the important cash h crops in arrid and semi--arid regions s of India
(67%) and Gujarat accounts for 29,000 tonnes (33%) for total national Isabgol production and Rajasthan state accounts for 95,000 hectares area under this crop with
Pikovskaya medium containing tricalcium phosphate as sole source of phosphorus for bacterial growth provided the rough estimate of phosphate solubilizing bacterial (PSB) population and it ranged from 0.2x103 to 4.8x103 cfu/g and Pseudomonads population on Kings B medium varied from 3.3x106 to 5.8x106 cfu/g soil among the collected soil samples of Isabgol crop (Table 3)
Summary
Isabgol (Pla antago ovata a Forks.) is one o of the important cash h crops in arrid and semi--arid regions s of India. (67%) and Gujarat accounts for 29,000 tonnes (33%) for total national Isabgol production and Rajasthan state accounts for 95,000 hectares area under this crop with 60-90 days, respectively were collected during the crop growth stage of pre-flowering in rabi season so that maximum microbial activity under plant root influence could be observed from the rhizospheres of Isabgol growing soils of Barmer, Jalore and Jaiselmer districts of Rajasthan (Table 1).
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