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The experiment was conducted at charland of Charsadipur in Pabna district under AEZ-11 during Khrif season of 2014 and 2015 to determine appropriate fertilizer dose for enhancing yield of blackgram as well as to increase farmers’ income. The experiment was laid out in a randomized complete block design with four dispersed replications. Eight fertilizer packages, viz.T1: N20P15K6S9Zn2 kg ha-1(STB), T2: N25P15K6S9Zn2kg ha-1, T3: N25P19K6S9Zn2 kg ha-1, T4: N25P15K8S9Zn2 kg ha-1, T5: N20P19K8S9Zn2 kg ha-1, T6: N25P19K15S9Zn2 kg ha-1, T7: N15P11K5S7Zn1.5kg ha-1and T8: Native nutrients (control) were tested on blackgram. Fertilizer package of N25P19K15S9Zn2 kg ha-1 (T6) enhanced crop growth and yield of blackgram in both the years. Maximum seed yield of blackgram (1.43t ha-1 in 2014 and 0.97 t ha-1 in 2015) was obtained with N25P19K15S9Zn2 kg ha-1 (T6), which was 80 and 147% more than the control in 2014 and 2015, respectively. The highest gross return (Tk. 82815 ha-1 in 2014 and Tk. 65200 ha-1 in 2015) and gross margin (Tk. 51125 ha-1 in 2014 and Tk. 32020 ha-1 in 2015) were also recorded from the same treatment in both the years. The results revealed that fertilizer package of N25P19K15S9Zn2kg ha-1 might be recommended for getting higher seed yield of blackgram and economic return as well under charland condition of Pabna district . Introduction Pulses are vital legume crops in Bangladesh and used as food, feed and fodder. It is rich in protein. It also contains amino acid and lysine which are generally deficient in food grains (Elias et al., 1986). Pulses play an important role in sustaining soil health. They are generally grown without fertilizer since they can meet their nitrogen requirement by symbiotic fixation of atmospheric nitrogen in the soil (Senanayake et al., 1987; Zapata et al., 1987; Fried and Middleboe, 1977). The per capita consumption of pulse in Bangladesh is only 12 g day-1, which is much lower than WHO recommendation of 45 g day-1 (Afzal et al., 1999). Blackgram (Vigna mungo L.), one of the major pulse crop, stands fourth both in acreage and production in Bangladesh. Blackgram provides about 10.5% of the total pulse produced in Bangladesh and its seed contains about 25% protein (BARI, 1998). It is mainly grown for human consumption, though widely used as fodder for cattle and green manuring crop to improve soil fertility. In Bangladesh the char lands of char area are not suitable for all types of crop. In Pabna, there is a vast area of charland under AEZ-11. Soil of charland is coarse textured having low water holding capacity, low nutrient and organic matter content. Farmers of charland in Pabna generally grow local variety of blackgram with no or limited fertilizers. For this reason, the 90 Maniruzzaman et al. yield of blackgram in this region ismuch lower than that of potential yield. Balanced fertilization can play a major role toenhance the present yield level. Experimental evidences reveal that the crop is highly responsive to different fertilizers and its yieldcan be increased remarkably through judicious fertilization (BARI, 1988; Mohamed, 1984; Roy and Singh, 1986; Kazi et al., 2002). Fertilizer recommendation solely based on crop response data often fails to show economic viability. In this context, Perrin et al. (1979) reported that response of yield should be supported by economic evaluation for judicious fertilizer recommendation. Therefore, judicious application of fertilizer along with economic evaluation is important for blackgram. But very limited information is available in this regard in Bangladesh context. Hence, the present study was undertaken to determine the optimum fertilizerdose for getting higher economic benefit for blackgram in charland of Pabna district. Materials and Method The experiment was conducted at charland of Charsadipur in Pabna district during the Khrif-II season of 2014 and 2015. Soil series of the experimental site was Gopalpur belonging to the High Ganges River Floodplain Soils (AEZ-11). Before sowing, initial soil samples (0-15 cm depth) were collected from the experimental plots and were analyzed. The analytical results indicated that soil was sandy loam with verylow organic matter content (0.78%) and slightly alkaline in nature. N content of soil was very low and P, S and Zncontent were also low. K content of the soil was medium (Table 1). The experiment was laid out in randomized complete block (RCB) design with three dispersed replications. The unit plot size was 5m x 4m. Table 1. Nutrient status of initial soil sample (0-15 cm depth) of experimental plots at Charsadipur, Pabna. Soil properties Values Interpretation Soil pH 8.1 Slightly alkaline Organic matter content (%) 0.78 Very low Total N (%) 0.05 Very low Available P (μgg-1 soil) 11.6 Low Available S (μgg-1 soil) 9.3 Low Available Zn (μgg-1 soil) 0.56 Low Exchangeable K (meq%) 0.18 Medium T1: N20P15K12S9Zn2 kg ha-1 (STB), T2: N25P15K12S9Zn2kg ha-1, T3: N25P19K12S9Zn2kgha-1, T4: N25P15K15S9Zn2kgha-1, T5: N20P19K15S9Zn2kgha-1, T6: N25P19K15S9Zn2kg ha-1, T7: N15P11K9S7Zn1.5 kg ha-1 and T8: native nutrient (control). Full amount of all fertilizers were applied as basal according to treatments. Seeds of blackgram were broadcasted in each plot on 15-20 August maintaining the seed rate of 35 kg ha-1 in both the year . The variety used this trial was BARI Mash-3. Two weedings were done at 25 and 40 days after sowing (DAS) for better growth of the crop. Ripcord 50 EC was applied at 35 DAS to control leaf feeding insect. Other intercultural operations were done when required. The above ground part of blackgram was harvested on 10-15 November in both the year. Data on days to 50% flowering, days to 80% maturity were taken from all plots. Plant height, pods plant1,seeds pod-1and 1000-seed weight were collected from randomly selected 10 plants at maturity stage from each plot. Seed yield and stover yield were taken from whole plot. All collected data were analyzed statistically by using MSTAT package and the means were adjudged by LSD test at 5% level of significance. Cost and return analysis of different treatments were also done . Results and Discussion Development of Fertilizer Recommendation for Blackgram 91 Phenological characters Phenological characters ofblackgram have been presented in Table 2. Significant variation in days to 50% flowering, days to 80% maturity and plant height were observed due to execution of different treatments. Maximum days to 50% flowering (53 in 2014 and52 in 2015 ) and days to 80% maturity (74 in 2014and 83 in 2015) were recorded from N25P19K15S9Zn2kg ha(T6) which was statistically different from all other fertilizer packages while minimum days to 50% flowering (46.67 in 2014 and 45.67 in 2015) and days to 80% maturity (70.67 in 2014 and 77.67 in 2015) were recorded from control plot (T8). The highest plant height (38.0 cm in 2014 and 50.3 cm in 2015) was measured from N25P19K15S9Zn2kg ha-1 (T6) and the lowest plant height (33.43 cm in 2014 and 38.62cm in 2015) was recorded in control plot (T8). Table 2. Phenological parameters of blackgram as affected by different levels of nutrients during kharif season of 2014 and 2015 at Charsadipur, Pabna Treatment Days to 50% flowering (no.) Days to 80% maturity (no.) Plant height (cm) 2014 2015 2014 2015 2014 2015 T1: N20P15K12S9Zn2 kg ha-1 (STB) 48.33 47.33 72.00 80.33 36.27 38.95 T2: N25P15K6S9Zn2 kg ha-1 50.33 49.33 72.33 82.00 37.23 39.99 T3: N25P19K6S9Zn2 kg ha-1 50.67 49.67 73.00 81.67 37.63 43.66 T4: N25P15K15S9Zn2 kg ha-1 51.33 50.33 73.00 81.33 36.20 45.30 T5: N20P19K15S9Zn2 kg ha-1 51.00 50.00 72.67 80.67 35.67 43.68 T6: N25P19K15S9Zn2 kg ha-1 53.00 52.00 74.00 83.00 38.00 50.30 T7: N15P11K9S7Zn1.5 kg ha-1 47.67 46.67 71.67 79.33 36.40 42.34 T8: Control 46.67 45.67 70.67 77.67 33.43 38.62 LSD(0.05) 0.908 0.90 1.186 0.84 1.415 5.92 CV(%) 6.04 5.06 8.67 6.60 7.60 6.38 Yield contributing characters Yield contributing characters of blackgram are presented in Table 3. Significant variation in number of pods plant-1, number of seeds pod-1, and 1000 -seed weight were observed due to execution of different treatments. Maximum number of pod plant-1 (24.47 in 2014 and 18.17 in 215) was found from N25P19K15S9Zn2 kg ha-1 (T6) in both the year while minimumnumber of pods plant-1 (17.27 in 2014 and 14.23 in 2015) was recorded from control plot (T8). In case of number of seeds pod-1, no significant difference was found among the treatments except control. Significantly higher 1000-seed weight was observed from in all the fertilizer packages over control in both the years and the lowest 1000 -seed weight (33.63 g in 2014 and 34.67g in 2015) from control plot (T8). Table 3. Yield contributing parameters of blackgram as affected by different levels of nutrients during kharifseason of 2014 and 2015 at Charsadipur, Pabna Treatments Pods plant-1 (no.) Seeds pod-1 (no.) 1000-seed weight (g) 2014 2015 2014 2015 2014 2015 T1: N20P15K12S9Zn2 kg ha-1 (STB) 19.44 16.73 6.850 6.32 34.77 34.90 T2: N25P15K6S9Zn2 kg ha-1 20.04 16.97 6.900 6.37 34.80 34.93 92 Maniruzzaman et al. T3: N25P19K6S9Zn2 kg ha-1 21.07 18.07 7.010 6.53 34.90 34.97 T4: N25P15K15S9Zn2 kg ha-1 19.30 17.63 7.060 6.50 35.27 35.13 T5: N20P19K15S9Zn2 kg ha-1 20.81 17.83 6.830 6.77 35.17 35.47 T6: N25P19K15S9Zn2 kg ha-1 24.47 18.17 6.767 6.83 35.40 35.90 T7: N15P11K9S7Zn1.5 kg ha-1 18.04 15.67 6.50 6.00 34.73 35.00 T8: Control 17.27 14.23 6.37 5.67 33.63 34.67 LSD (0.05) 3.24 2.125 0.65 0.53 0.896 1.088 CV (%) 9.25 5.17 5.49 2.45 1.47 1.77 Yield and percent yield increase over control of blackgram have been presented in Table 4.Maximum stover yield of blackgram (1.77 t ha-1 in 2014 and 1.4 t ha-1 in 2015) was found from N25P19K15S9Zn2kg ha-1 (T6) treatment and minimum stover yield (0.97 t ha-1 in 2014 and 1.0 t ha-1 in 2015) was found from control plot (T8). The highest seed yield (1.43 t ha-1 in 2014 and 0.97 t ha-1 in 2015) was obtained from N25P19K15S9Zn2kg ha(T6) which was signif

Development of Fertilizer Recommendation for Blackgram in Charland of Pabna, Bangladesh