Seed collection and Soil preparation- The during rabi season from December, 2014 through March, 2015 and December, 2015 through experiment was carried out March, 2016 in the net house of Soil Science Division, BARI, Joydebpur, Gazipur (230 59'38'' N latitude, 900 24'89'' E longitude and 8.4 m elevation). Seeds of lentil (BARI Masur-5) were collected from Pulse Research Centre, BARI, Gazipur. The silted (sandy clay loam) soils were collected from the bank of Turag river at Kodda, Gazipur mixed with cowdung at 5:1 ratio and was used as the potting media. Each pot (28 cm in diameter and 23 cm in height) was filled with approximately 8-kg soil leaving upper 3 inches of pot vacant to facilitate watering. The pH of cowdung was 6.7 and the nutrient contents were: organic matter 14.1%, N 0.8%, P 1.26%, K 0.88%, Ca 1.55%, Mg 0.82%, S 0.62%, Fe 0.25% and Mn 0.112%. The physical and chemical properties of the soil were presented in Table 1. The soil contained 12 AM (100-1 g soil) spores of indigenous mixed AM fungal species and the experiment was conducted under unsterilized soil condition. Soil analysis- Soil pH was measured by a combined glass calomel electrode. Organic carbon was determined by Wet Oxidation Method. Total N was determined by modified Kjeldahl method. Calcium, K and Mg were determined by NH4OAc extraction method. Copper, Fe, Mn and Zn were determined by DTPA extraction followed by AAS reading. Boron was determined by CaCl2 extraction method. Phosphorus was determined by Modified Olsen method (Neutral + Calcareous soils). Sulphur was determined by CaH4(PO4)2.H2O extraction followed by turbidimetric method with BaCl2. Fertilizer application- Chemical fertilizers @ 11.53 mg N: 9.9 mg P: 11.55 mg K: 6.18 mg S: 0.60 mg Zn: 0.37 mg B: 0.17 mg Mo kg-1 soil was applied (BARC, 2012). Urea, TSP, MoP, Gypsum, ZnSO4, Boric acid and Na2MoO4 were used as a source of N, P, K, S, Zn, B and Mo, respectively. Total amount of TSP, MoP, Gypsum, ZnSO4, Boric acid, Na2MoO4 and half of N was broadcast and incorporated during final pot preparation and remaining N was applied in two equal splits at 15 and 35 days after sowing. Preparation of NaCl solution and Mycorrhizal inoculum- Different concentrations of NaCl solution was prepared according to experimental design and 250 mL of each NaCl solution was applied in each pot with irrigation water before sowing of lentil seed. The developed soil salinity was within the range of 1.04 to 3.75 dSm-1. The AM inoculum was prepared from the roots and rhizosphere soils of sorghum. Mycorrhizal species was originally isolated from different AEZs, using the wet sieving and decanting method (Gerdemann and Nicolson, 1963). The spores were left to multiply for 6 months on sorghum plants using unsterilized soil, collected from the same site, in the net house of Soil Science Division, BARI. Plants were irrigated with tap water as needed. A mixture of infected sorghum root and soil which contained spores was used as mycorrhizal inoculum. The soil based AM fungal inoculum containing 150 g of rhizosphere soil (approximate 209.67 ± 5.5 spores/100 g soil) and infected sorghum root fragments with a minimum infection level was inoculated to each mycorrhizal pot. Figure 1 represents different mycorrhizal spore identified in the Soil Microbiology Laboratory, Soil Science Division, BARI and used for the experiment. The mycorrhizal inoculum were first placed in each pot at 3-5 cm depth and was covered with a thin soil layer of 1 cm immediately prior to the seed sowing of lentil to facilitate fungal colonization of plant roots. Design of experiment and treatments- The experiment was designed in factorial RCBD with 10 treatments combination and 4 replications. Twenty seeds were sown in each pot at 1 cm soil depth. The treatment was sustained with 11-14 vigorous seedlings in mycorrhizal and non-mycorrhizal pot and the other seedlings were removed from the pot. The 10 treatment combinations were: T1: NaCl 0%, T2: NaCl 0% + AM, T3: NaCl 1%, T4: NaCl 1% + AM, T5: NaCl 2%, T6: NaCl 2% + AM, T7: NaCl 3%, T8: NaCl 3% + AM, T9: NaCl 4% and T10: NaCl 4% + AM. Determination of germination percentage The germination test was carried out according to International Seed Testing Association (ISTA) rules. For each treatment, 100 seeds were put into Petridishes. The Petridishes were put on a laboratory table at room temperature (25 ± 2oC). After 8 days, normal, abnormal and diseased seeds were counted. Germination of lentil seed in the laboratory table was 85%. Twenty seeds were sown in each pot. Lentil was harvested after 90 days of sowing. After harvesting root parts were cleaned under running tap water and allow for drying at room temperature. Different growth parameters like root length, shoot length and plant height were measured by using centimeter scale. Plant dry weight, total seed weight, 1000-seed weight, seed yield and stover yield were measured by using digital weight balance and pods plant-1 were counted by using hand. Statistical analysis- Data were statistically analyzed using Analysis of Variance (ANOVA) following Crop Stat package while the all pair comparisons were done by Statistix 10.