~ 1722 ~ Journal of Pharmacognosy and Phytochemistry 2019; 8(6): 1722-1726 E-ISSN: 2278-4136 P-ISSN: 2349-8234 JPP 2019; 8(6): 1722-1726 Received: 07-09-2019 Accepted: 09-10-2019 Bipul Kumar Singh Department of Horticulture (Vegetable and Floriculture), Bihar Agricultural University, Bhagalpur, Bihar, India RB Verma Department of Horticulture (Vegetable and Floriculture), Bihar Agricultural University, Bhagalpur, Bihar, India Mahendra Singh Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University, Bhagalpur, Bihar, India Amit Kumar Sah Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University, Bhagalpur, Bihar, India Manju Kumari Department of Horticulture (Vegetable and Floriculture), Bihar Agricultural University, Bhagalpur, Bihar, India Corresponding Author: Bipul Kumar Singh Department of Horticulture (Vegetable and Floriculture), Bihar Agricultural University, Bhagalpur, Bihar, India Effect of integrated use of bio- inoculants, organic and chemical fertilizers on soil microbial population, soil properties and incidence of pathogens on okra [ Abelmoschus esculentus (L.) Moench Bipul Kumar Singh, RB Verma , Mahendra Singh, Amit Kumar Sah and Manju Kumari Abstract A Field experiment was conducted at Vegetable Research Farm, Department of Horticulture (Vegetable and Floriculture), Bihar Agricultural University, Sabour during Kharif season of 2017 to explore the best integration of microbial inoculant, organic and chemical fertilizers with respect to improving physical and biological properties of soil and yield of okra by minimising yellow vein mosaic virus. The experiment was laid out in randomized block design replicated thrice. The results indicated that the application of 25 % RDN through chemical fertilizer + 75 % RDN through vermicompost + Azotobacter + PSB (T16) improved, chemical (p H , EC, O. C, Available N, P, K) and biological (Azotobacter, PSB, Fungi ) properties of the soil, reduced the Per cent disease incidence was of YVMV and enhanced the yield of okra. Thus it can be inferred that the nutrient supply through 75% chemical and 25% through Vermicompost along with the use of biofertilizers (Azotobacter + PSB) is beneficial for improving the soil health, minimising the YVMV and increasing the yield of okra. Keywords: Integrated, bio-inoculants, inorganic, vermicompost, YVMV, yield Introduction The okra [Abelmoschus esculentus (L.) Moench], which is also known as ‘lady’s finger’ or bhindi belonging to family Malvaceae is a native to Tropical and subtropical Africa, possibly Ethiopia. It is cultivated in tropical, sub-tropical and mild temperate parts of the world for its tender pods, which are cooked and consumed as a vegetable purpose. Pods are good source of carbohydrate, protein, vitamins and minerals and contain 35.0 mg calories, 6.4 mg carbohydrates 13.10 mg vitamin C (100 g -1 ), 66.0 mg calcium, 0.35 mg iron, 97 mg iodine and 30.0 mg sulphur per 100g of fresh weight (Gopalan et al., 2007) [7] . The presence of iodine in the pods of okra makes it a good remedy for goitre. The pod also contains good amount of mucilage and fibre, which is beneficial against chronic dysentery, fever and genitor urinary disorders. Nitrogen is one of the important essential major nutrients that play a vital role in encouraging vegetative growth, imparting a dark green colour to the leaves and improving the quality of vegetables. It is an essential constituent of protein and chlorophyll and is present in many other compounds of known physiological importance like plant metabolism such as nucleotides, phosphatides, alkaloids, enzyme, vitamins and hormones, etc. Phosphorus is rightly called the ’mineral of life’ as it helps in vital energy transformation process. It is a constituent of nucleic acid, phospholipids and co-enzyme NADP, which is constituent of ATP an energy rich bond. It promotes the root, improves quality of the crop and increase resistance to diseases. Deficiency of phosphorus may causes dark to blue green foliage, necrosis of leaves petioles and fruits also. Potassium is the third important major essential element that imparts disease resistance to plant. Vermicompost is a good source of micro and macro nutrients. It also acts as chelating agent and regulates the availability of metabolic nutrients to the plants and increases the plant growth and yield by providing nutrients in available form. Vermicompost contains 1.2, 0.6 and 0.8 % N, P and K, respectively depending upon materials used. Recently, the biofertilizers have shown a good promise and have emerged as an important component of integrated plant nutrition system.