EFFECT OF POTASSIUM AND BORON ON LOW TEMPERATURE TOLERANCE IN MUNGBEAN UNDER LATE SOWING CONDITION

Abstract

The experiment was conducted at the research field of the Department of Agronomy, Sher-e-Bangla Agricultural University (SAU), Dhaka-1207 during the period from September 2013 to January 2014 to study the effect of potassium and boron on low temperature tolerance in mungbean under late sowing condition. The experiment consisted of two factors: Factor A: Fertilizer doses (5 level)- F0 = Recommended dose (R), F1 = R+ Additional 10kg K ha-1 +1kg B ha-1, F2 = R+ Additional 20 kg K ha-1 +1kg B ha-1, F3 = R+ Additional 10 kg K ha-1 +2 kg B ha-1, F4 = R+ Additional 20 kg K ha-1 +2 kg B ha-1 and Factor B: Sowing time (2)- S1 = 24 September, S2 =25 October. The experiment was laid out in a split plot design with three replications where different level potassium and boron were placed on main plot and sowing time was in sub plots. Result showed that the tallest plant (40.03 cm), highest 1000-seed weight (37.53 g) and seed yield (1.12 t ha-1) were found at F3 fertilizer dose and those of the lowest were obtained from F0. Mungbean sown on 24 September (S1) recorded the highest values in case of plant height (50.57 cm), dry matter of leaf and stem (0.824 g and 1.147 g) at 60 DAS, pod length (7.09 cm), no. of pods plant-1 (13.74), no. of seeds pod-1 (8.22), 1000-seed weight (38.34 g), seed yield (1.14 t ha-1), stover yield (1.22 t ha-1) and biological yield (2.36 t ha-1). It was also observed that F3 gave the highest seed yield (1.29 t ha-1) which was statistically similar (1.27 t ha-1) with F2 when sown on 24 September, and F1 gave the highest seed yield (1.06 t ha-1) and significantly different from all other treatments when sown on 25 October. Results suggested that F2 & F1 may be recommended when sown respectively on 24 September and 25 October.