Experimental Site and Soil: The experiment was conducted during April 2013 to September 2013 at the field of Horticulture Research Centre (HRC), Bangladesh Agricultural Research Institute (BARI), located in the moist monsoon subtropical region of Gazipur (24° 0′ 13″ N latitude; 90° 25′ 0″ E longitude) at an elevation of 8.4 m above sea level. The soils in this area are classified as grey terrace according to the USDA Soil Taxonomy [22] and belong to the chhiata soil series under the agroecological zone - Madhupur Tract (AEZ-28). The experimental site has a typical tropical and sub-tropical continental monsoon climatic condition. It is characterized by comparatively high monsoon rainfall, high humidity, and high temperature [23]. The mean annual air temperature is 31.90 C. The mean annual precipitation is 451.8 mm, with approximately 72.9% occurring from June to October. Before starting the experiment, initial soil sample (0-15 cm) of the experiment was analyzed and the chemical properties are presented. Land Preparation, Treatments, Design and Layout A tractor operated disc plough was used for open the land. After that the land was prepared thoroughly by tractor operated rotavetor followed by laddering and leveling. The experiment was planned with 16 treatment combinations comprising four levels each of B (0, 0.1, 0.2 and 0.3% borax, respectively) and Zn (0, 0.1, 0.2 and 0.3% zinc sulphate, respectively) along with the blanket dose of fertilizer of N, P, K, S and cow dung at 120, 40, 80, 20 and 10000 kg ha -1 , respectively was used in all treatments. The treatments were arranged viz. T1=B0Zn0; T2=B0Zn0.1; T3=B0Zn0.2; T4=B0Zn0.3; T5=B0.1Zn0; T6=B0.1Zn0.1; T7=B0.1Zn0.2; T8=B0.1Zn0.3; T9=B0.2Zn0; T10=B0.2Zn0.1; T11=B0.2Zn0.2; T12=B0.2Zn0.3; T13=B0.3Zn0; T14=B0.3Zn0.1; T15=B0.3Zn0.2 and T16=B0.3Zn0.3. The spray treatments were clarified as B0 = 0% borax (as 0% boron), B0.1= 0.1% borax (as 0.01% boron), B0.2= 0.2% borax (as 0.02% boron), B0.3= 0.3% borax (as 0.03% boron) and Zn0 = 0% zinc sulphate (as 0% zinc), Zn0.1 = 0.1% zinc sulphate (as 0.04% zinc), Zn0.2 = 0.2% zinc sulphate (as 0.07% zinc), Zn0.3= 0.3% zinc sulphate (as 0.11% zinc). The two factor experiment was laid out in the randomized complete block design with three replications. The sources of N, P, K, S, B and Zn were urea, TSP, MoP, gypsum, boric acid and zinc sulphate, respectively. The unit plot size was 4 m × 2.4 m, where 40 plants were accommodated in each plot at a spacing of 60 cm × 40 cm. Two adjacent unit plots were separated by 70 cm space, and there was 100 cm space between the blocks. Preparation of B and Zn Spray Solution and Application Method As per the treatment details one gram of borax was dissolved in one litre water in a container to make 0.1 per cent borax solution and one gram of zinc sulphate was dissolved in one litre of water in another container to make the concentration of 0.1 per cent zinc sulphate solution. Similarly two grams and three grams of borax and zinc sulphate were dissolved in one litre of water to make 0.2% and 0.3% borox and zinc sulphate solution, respectively. Then all the micronutrient solutions were used to spray. The foliar spray was given for three times first before flowering at 32 DAS, second after third picking, at 85 DAS and third one at 15 days after second spray. On the other hand, full dose of cowdung, TSP, gypsum, ½ of MoP and ¼ of urea were applied during final land preparation. Remaining MoP was applied at 40 days after sowing. Rest of urea was applied with 3 equal splits at 20, 40 and 60 days after sowing. 2.4. Seed Sowing and Agronomic Practice The test crop variety was BARI Dharosh-1. Healthy seeds were sown in a line maintaining plant to plant distance of 40 cm and three seeds were sown per pit. After 12 days of sowing (5-6 leaves stage), comparatively weak seedlings were removed from each pit and finally only one healthy and vigorous seedling was kept in a pit. Two hand weedings were done for all plots at 25 and 60 days after sowing. The disease influx was managed by spraying the fungicide Secure 600 wg @ 0.2% two times at an interval of 10 days start at flowering stage. The insect (pod borer and aphid) infestations were controlled by spraying Karate @ 0.2% two times at 10 day intervals start at fruit bearing stage. Irrigation was applied as and when required. Seeds were collected after picking the mature fruits. Seed Collection Seeds were collected manually from the fruits and cleaned, graded and sun dried for 4 days to attain the acceptable moisture level as close to 8% measured by Seed Buro moisture meter (12 Series Moisture Tester, Model-1200). Oil Content in Seed The oil percentage was estimated following Gadgil et al. [25] method from moisture-free seed meal by solvent extraction using other petroleum ether (boiling point 60°C to 80°C) in a Soxhlet appratus for eight hours. The meal was pre-dried (60°C; 24 hours). Two grams of meal were used for the estimation of oil. No further oil was recovered from the residue after eight hour of refluxing. 2.6. Soil Sample Collection and Analysis Initial soil sample (0-15 cm depth) of three locations were collected and brought to the laboratory and spread on a brown paper for air drying. The air-dried soil samples were ground and passed through a 2-mm sieve. The sieving soil samples were kept into plastic container with proper label for chemical analysis. Soil pH was measured by glass electrode pH meter using soil: water ratio of 1: 2.5 [26]. Organic carbon was determined following the wet oxidation method as described by Page et al. [26] and the organic matter content was calculated by multiplying the% organic carbon with the Van Bemmelen factor 1.73. Total N by Microkjeldahl method [27]; available P was determined following Bray and Kurtz [28] method; exchangeable K by 1N NH4OAc method [29]; exchangeable Ca by 1N NH4OAc method [30]; available S by turbidity method using BaCl2 [31]; available Zn by DTPA method [32]; available B by azomethine-H method [26]. 2.7. Statistical Analysis Collected data were analyzed statistically using MSTAT-C computer package program. The significance of the difference among the treatments was estimated by Duncan’s Multiple Range Test (DMRT) at 5% level of probability [33].