A field experiment was carried out in Old Brahmaputra Floodplain (AEZ-9) soil at Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh during aman season of 2011 to evaluate the response of BINA dhan7 to different levels of potassium and sulphur. The experiment was laid out in a randomized complete block design with three replications. There were six treatments such as T1: Control, T2: NPZnK0S0, T3: Recommended Fertilizer Dose (RFD), T4: RFD-20% KS, T5: RFD-40% KS, T6: RFD + 20% KS and T7: RFD + 40% KS. Eighty kg N ha-1, 15 kg P ha-1, 50 kg K ha-1, 12 kg S ha-1 and 2 kg Zn ha-1 were applied as Recommended Fertilizer Dose (RFD). Nitrogen, phosphorus, potassium, sulphur and zinc were supplied from urea, TSP, MoP, gypsum and zinc oxide, respectively. The full dose of TSP, MoP, gypsum and zinc oxide were applied as basal dose during final land preparation while urea was applied in three equal splits. The application of K and S had a significant influence on plant height, effective tillers hill-1, panicle length and filled grains panicle-1. The grain and straw yields of BINA dhan7 were significantly affected due to different treatments. The highest grain yield of 5.23 t ha-1 and straw yield of 7.05 t ha-1 were observed with the treatment T7 (RFD + 40% KS) and statistically similar yields were recorded with the treatments T6 (RFD + 20% KS) and T3 (RFD). The grain yield was increased by 48.3 to 97.4% over control due to application of different levels of K and S fertilizers. Overall results indicate that there is no need to add more K and S beyond the recommended rate (50 kg K and 12 kg S ha-1) for achieving the satisfactory yield of BINA dhan7 in Old Brahmaputra Floodplain Soil of BINA dhan7 at BAU farm soil, Mymensingh.
Key words: Fertilizer, BINA dhan7, potassium, sulphur
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