YIELD RESPONSE OF WHEAT TO THE APPLICATION OF LIME AND PHOSPHOROUS

Abstract

A field experiment was conducted at Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during November 14, 2012 to March, 2013 in rabi season with a view to find out the yield response of wheat (BARI gom 26) to the application of lime and phosphorous . The experiment comprised of three levels lime viz. (i) L0 = no lime (control), (ii) L1 =1t ha-1, and (iii) L2 = 2 t ha-1 and four phosphorus levels viz. (i) P0 = no P2O5 (control), (ii) P1 = 48 kg P2O5 ha-1,(iii) P2 = 77 kg P2O5 ha-1 and (iv) P3 = 106 kg P2O5 ha-1. The experiment was laid out in a split-plot design with three replications where lime were placed in the main plot and phosphorus fertilizers were in sub-plots . Experimental results indicated that different lime levels had the significant effect on plant height, dry weight plant-1, relative water content (RWC), water saturation deficit (WSD) , water retention capacity (WRC), effective tillers plant-1, spike length, spikelets spike-1, grains spike-1, grain yield, straw yield and harvest index. The highest grain yield (3.09 t ha-1) was recorded at 2 t ha-1 that mainly attributed by the maximum effective tillers plant-1, spikelets spike-1, grains spike-1 and 1000-grain weight. Among the different phosphorus levels , 77 kg P2O5 ha-1 gave the highest grain yield (3.16 t ha-1) and it was mainly attributed by the maximum effective tillers plant-1, maximum spikelets spike-1, maximum grains spike-1 and 1000-grain weight. The interaction effect of lime and phosphorus levels showed significant response on yield attributing characters of wheat .The highest plant height (85.20 cm), effective tillers m-2 (223.30), spike length (17.73 cm), spikelets spike-1 (20.67) grains spike-1 (64.33), 1000 grain weight (42.50 g) were observed with interaction of lime and phosphorus treatment. Again, the maximum grain yield (3.87 t ha -1) was found with the interaction of 2 t ha-1 lime and 77 kg P2O5 ha-1 and straw yield (6.437 t ha-1) with the interaction of 2 t ha-1 lime and 106 kg P2O5 ha-1.These results suggest that the interaction of 2 t ha-1of lime with 77 kg ha-1 phosphorus is suitable for enhancing grain yield of BARI Gom 26 under high acidic soil.