EFFECTS OF POTASSIUM AND SULPHUR WITH VERMICOMPOST ON GROWTH AND YIELD OF BORO RICE (BRRI dhan81)

Abstract

The experiment was conducted at the research field of Sher-e-Bangla Agricultural University, Dhaka from November 2020 to May 2021 to investigate the effects of potassium and sulphur with vermicompost and to find out the best combination for better performances of Boro rice (BRRI dhan81). The experiment consisted two factors, Factor A: four potassium and sulphur fertilizer treatments viz: F : Control (no fertilizer), F 1 : 70 kg K ha -1 + 10 kg S ha -1 , F 2 : 100 kg K ha -1 + 20 kg S ha : 130 kg K ha -1 + 30 kg S ha -1 and Factor B: three vermicompost treatments viz: V : Control (no vermicompost), V 1 : 2 t vermicompost ha -1 and V 2 0 -1 and F : 4 t vermicompost ha . The experiment was laid out in randomized complete block design with three replications. Data were recorded on growth parameters, yield and yield components. The treatments had significant effects on most of the parameters. Results indicated that F , among the potassium and sulphur treatments and V , among the vermicompost treatments performed best in case of most growth and yield related characteristics like plant height, total number of tillers hill -1 2 , number of panicles hill -1 , panicle length, number of spikelets panicle -1 , number of filled spikelets panicle -1 , number of unfilled spikelets panicle -1 , 1000 grain weight, grain yield and straw yield. In case of treatment combinations the total number of tillers hill -1 (17.9) and panicles hill (16.7) were received from F 2 V 2 . Again, F 2 V treatment combination also performed the best result in case of the panicle length (23.25 cm), number of filled spikelets panicle 2 (126.41), total number of spikelets panicle -1 -1 (147.50) and 1000-grain weight (20.94 g). F

treatment combination produced the highest grain and straw yield (6.60 t ha and 8.74 t ha -1 respectively). On the contrary, control treatments performed the lowest in all the growth and yield related parameters. Finally, the treatment combination F which is 100 kg ha -1 potassium

and 20 kg ha -1 sulphur with 4 t ha -1 vermicompost performed the best for increasing the yield of Boro rice and improved the nutrient status of postharvest soil of AEZ 28.