YIELD RESPONSE OF WHEAT AS AFFECTED BY IRRIGATION AND POTASSIUM FERTILIZER

Abstract

The study was conducted in the experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar. Dhaka during from November 2012 to March 2013 to find out the yield response of wheat as affected by irrigation and potassium fertilizer. BARI Gom-24 was used as a test crop of this study. The experiment comprised of two factors- Factors A: Irrigation, 1: No irrigation i.e. control; I,: Irrigation at 20 DAS (crown root initiation stage); 12: Irrigation at 55 DAS (flowering stage) and 13: Irrigation at 20, 55 and 75 DAS (crown root initiation stage, flowering stage and grain filling stage) and Factor B: Level of potassium fertilizer, K0 : 0 kg MOP ha', K1 : 50 kg MOP ha' and K 2 : 100 kg MOP hi1 . The experiment was laid out in split plot design where irrigation in main plot and potassium fertilizer in sub-plot with three replications. Data on growth. yield and yield parameter recorded and variation was observed for different treatment. In case of different levels of irrigation, the longest spike (18.19 cm) was observed from 13 , while the shortest spike (15.90) was observed from I. The maximum number of filled grains spike' (31.17) was observed from 13 , whereas the minimum number (26.22) was observed from 10. The highest grain yield (3.28 t hi') was observed from 1, while the lowest grain yield (2.23 t ha 1) was observed from 1. The highest straw yield (5.45 t hi') was observed from 13, whereas the lowest straw yield (3.87 t hi') was observed from 1 0 For different levels of potassium fertilizer, the longest spike (18.63 cm) was observed from K 3 treatment, while the shortest spike (15.03 cm) was observed in K0 . The maximum number of filled grains spike (31.54) was observed from K 3 treatment, while the minimum number of filled grains spike" (24.33) was found in K0 . The highest grain yield (3.25 t hi') was observed from K3 treatment, while the lowest grain yield (2.38 t hi') was found in K 0 . The highest straw yield (5.45 t hi') was observed from K3 treatment, again the lowest straw yield (4.14 1 hi1 ) was found in K0 . Due to interaction effect of different levels of irrigation and potassium fertilizer, the longest spike (19.60 cm) was observed from 1 3K2 . while the shortest spike (13.80 cm) was recorded from 10K0 . The maximum number of filled grains spike'' (34.83) was observed from 13K2 and the minimum number of filled grains spike- ' (23.33) was recorded from 12K0. The highest grain yield (3.79 t hi') was observed from I 3K2, while the lowest grain yield (2.04 t hi') was recorded from 10K0. The highest straw yield (6.09 t hi') was observed from 13K2 . while the lowest straw yield (3.77 t ha1 ) was recorded from 10K0 . Irrigation at 20, 55 and 75 DAS (crown root initiation stage, flowering stage and grain filling stage) and 100 kg K 2 0 ha' gave the better performance in terms of growth and yield of wheat.