RESPONSE OF SUMMER ONION TO POTASH AND ITS APPLICATION METHODS

Abstract

A field experiment was conducted at On Farm Research Division of Bangladesh Agricultural Research Institute. (Jazipur during March 2005 to July 2005 to evaluate the effects of different levels of potash and their application methods on growth, yield and yield attributes of onion Six different levels of potash viz. 0. 150 kg ha" and three application methods viz, 30. 60. 90. 120 and basal ¼ basal 1 '/ at 20 DAT and ¼ basal + ¼ at 20 DAT ± ¼ at 40 DAT were included in the present study .A significant improved in different growth parameters yield attributes . bulb yield as well as potassium uptake was observed in response to different application methods and levels of potassium . Among the methods highest bulb yield (11.85 t ha") was obtained from three split application of potassium and the lowest (11.49 t h a obtained from application of basal doses of potassium. Yield contributing characters shows the similar trend of response of K like bulb yield. Application of potassium at 120 kg ha" produced highest bulb yield (14.76 t ha"). but higher level of potassium did not show any more increase in yield of summer onion. The lowest bulb yield (7.94 ha") was obtained from control plants (0kg ha" potassium). The combined elThct of different levels of potassium and its application methods was statistically significant. The combination of three split application of 120 kg ha" potassium (K5B:) gave the highest bulb yield (15.27 t ha') and the lowest bulb yield (7.94 t ha") was obtained from control (IQ13o). Three split application of 120 kg ha" potassium (K considered to he optimum for getting higher yield as well as higher net profit (Tk. 1.46.100.00 for summer onion production at Chhiata series of Grey Terrace soils (AEZ 28). Gazipur, Bangladesh.