EFFECT OF ORGANIC MANURE AND DIFFERENT DOSES OF CHEMICAL FERTILIZER ON YIELD AND SEED QUALITY OF OKRA

Abstract

The pot experiment was conducted at the net house of agronomy research field in Sher-e-Bangla Agricultural University, Dhaka-1207 during the period from April to July 2018 to study the effect of organic manure and different doses of chemical fertilizers on the yield and seed quality of okra. Two factors were considered for the present study such as three types of organic manures viz., M 1 = Cowdung (10 t ha ), M 2 = ACI compost (8 t ha -1 ) and M 3 = Vermicompost (5 t ha -1 ) and four levels of chemical fertilizers viz., F 0 = No fertilizer (NF), F 1 = Recommended dose of fertilizer (RDF; where N, P and K was at 60-90-60 kg ha -1 , respectively), F 2 = 25% less of RDF (45-67-45) and F 3 = 50% less of RDF (30-45-30). The experiment was laid out in randomized complete block design (RCBD) with three replications. Result revealed that, most of the studied parameters viz., plant height, pod diameter, pod length, green pod yield plant -1 , seeds pod -1 , 100-seed weight, seed yield plant -1 and germination percentage were significantly influenced by organic manures, inorganic fertilizers and their combination. The highest performances in terms of plant height at 20, 40 and 60 DAS (19.31, 82.28 and 104.96 cm, respectively), pod diameter (3.96 cm), pod length (11.59 cm), green pod plant (57.82), seed weight pod -1 -1 (6.75),green pod yield plant -1 (0.64 kg), seeds pod (6.01 g), 100-seed weight (6.24 g), seed yield plant (12.21 g) and shelling % (44.79)was found while vermicompost was used. On the contrary, the lowest value was observed while cowdung was applied. In terms of fertilizers doses, highest performances was observed at F 2 = 25% less of RDF treatment considering the plant height at 20, 40 and 60 DAS (20.05, 79.15 and 100.39 cm, respectively), branches number plant -1 (4.54), pod diameter (3.75 cm), pod length (11.34 cm), green pod plant -1 (7.38), seeds pod -1 (59.06), 100-seed weight (6.08 g), seed yield plant -1 (9.79 g) and shelling % (41.05). In case of interaction effect of organic and inorganic fertilizer, the maximum growth and yield attributes were observed in M 3 F 2 except the number of branches plant -1 (4.60) which was found in M 2 F 2 treatment combination. However, in case of seed quality parameters viz., germination percentage, root-shoot ratio, seedlings fresh weight (FW) and dry weight (DW), organic and inorganic fertilizers responded differently while in interaction the highest performances was found in M 3 F 2 combination. Thus it could be concluded that, application of vermicompost along with 25% less of RDF accelerated growth, yield and seed quality of okra.