Soil sample (0 to 15 cm depth) was collected from Bhulta, Rupganj Upazila, Narayanganj under the Dhaka division. The soil was air-dried, ground, and sieved through a 2 mm sieve and kept in polyethylene bags for analysis. The soil had a pH of 6.49 (soil and distilled water ratio 1: 2.5), organic matter 0.56% (Walkley and Black 1934), available N 21 mg kg–1 (Marr and Cresser 1983), and available P 5.8 mg kg–1 (Murphy and Riley 1962). A pot experiment was carried out in the net house of the Department of Soil, Water and Environment, University of Dhaka. Five kilograms of soil were taken per earthen pot (22.5 cm diameter × 18 cm depth). Pots were arranged in a completely randomized design. Eighteen treatments with three replicates were: T1: Control (-OM & -NPK) T2: ACI 10 ton ha-1
T3: FDAVc10 ton ha-1 T4: Green life 10 ton ha-1 T5: Kazi10 ton ha-1
T6: GTS 10 ton ha-1 T7: Majim 10 ton ha-1 T8: Shufola 10 ton ha-1 T9: Shebok 10 ton ha-1
T10: RD N60P36K50 kg ha-1(100%) T11:N30P18K25 kg ha-1 (50%) + ACI 5 ton ha-1
T12: N30P18K25 kg ha-1(50%) + FDAVc 5 ton ha-1
T13: N30P18K25kg ha-1(50%) + Green life 5 ton ha-1 T14: N30P18K25 kg ha-1(50%) + Kazi 5 ton ha-1
T15: N30P18K25 kg ha-1(50%) + GTS 5 ton ha-1
T16: N30P18K25 kg ha-1(50%) + Majim 5 ton ha-1
T17: N30P18K25 kg ha-1(50%) + Shufola 5 ton ha-1 and T18:N30P18K25kg ha-1(50%) + Shebok 5 ton ha-1
Eight types of organic manures and NPK fertilizers (Urea, TSP, and MoP) were collected from the local market. The manures were ACI, FDAVc, Green Life, Kazi, GTS, Majim, Shufola, and Shebok. Manures were mixed thoroughly at the rates of 10 and 5-ton ha–1. Recommended dose (RD) of NPK (60:36:50) kg ha–1 and half of RD of NPK (30: 18: 25) kg ha–1 were applied with a half dose of organic manures. Two seeds were sown per pot and finally, a seedling was allowed to grow. Water was applied daily in the morning. The range of temperature, humidity, and rainfall was 24° to 33°C, 60 to 73%, and 80 to 156 mm, during the experiment, respectively. Height was measured from the soil level to the tip of the leaf and leaf number was counted with the help of a tally counter at 40 days intervals but the values are presented in Table 1 at harvest time only. Organic manures and chemical fertilizers were applied to the pots two days before seed sowing. Weeding was done as and when needed. Insecticide was applied two times. Four months (120d) old plants were harvested as root, stem, leaf, and fruit. Samples were washed with tap water and finally with distilled water, wrapped with soft tissue paper, then air-dried at room temperature for ten days, and finally oven-dried at 65°C for 48 hours. Samples were ground with a mechanical grinder and stored in paper bags for chemical analysis. The concentration of N in fruits was determined by the micro- Kjeldahl steam distillation method (Cresser and Parsons 1979). For the concentration of P and K, 0.5 g fruit sample was digested following the method of Shelton and Harper (1941). Phosphorus was determined by vanadomolybdo phosphoric yellow color method at 430 nm using a spectrophotometer (model DR 5000) and potassium by using JANEWAY flame photometer (model PFP 7). Protein content in fruit was determined by the method of Magomya et al. (2014). Statistical analysis: Results were statistically analyzed using Microsoft Excel 2007 and Software Minitab 19.