STUDY OF MORPHOPHYSIOLOGICAL ASPECTS AND YIELD PERFORMANCE OF MUNGBEAN

Abstract

The present study was laid out to investigate to study the morphophysiological aspects and yield performance of mungbean. Four mungbean varieties viz. BARI Mung-2, BARI Mung3, BARI Mung-4 and BARI Mung-5 were used as the study materials. There were two experiments in the study. Experiment-1 was a laboratory experiment to evaluate the influence of temperature regimes (25, 30 and 35°C) on germination characteristics and seed reserves mobilization in mungbean varieties. Whereas, experiment-2 was conducted in research field of Crop Physiology and Ecology Department, HSTU, Dinajpur during February to June, 2011 to study the morphophysiological characteristics and yield of mungbean. Results showed that all the germination characteristics viz. rate of germination, co-efficient of germination and germination vigor index of all the four varieties of mungbean were found to be increased with increasing temperature from 25°C to 35°C. Shoot dry weight and ratio of shoot to root dry weight were increased with increasing temperature from 25°C to 35°C in all the varieties but in highest root dry weight were found in moderate temperature (30°C) and it was decreased both at 25°C and 35°C in all the varieties. All the varieties increased the loss of seed reserves due to respiration with increasing temperature from 25°C to 35°C. At highest temperature (35°C) BARI Mung-5 showed the highest respiratory loss, whereas the BARI Mung-2 had the lowest respiratory loss. Therefore, temperature had tremendous effect on seed metabolic efficiency (SME) in all the four mungbean varieties and at moderate temperature (30°C), all the varieties showed their highest SME than those of the lowest and highest temperature. In second experiment (Field study) it was found that BARI Mung-5 had the highest chlorophyll content whereas, the BARI Mung-2 showed the lowest chlorophyll content. BARI Mung-5 exhibit the highest total plant dry weight (TDM), plant height, pod length, dry weight of pod, total number of pod, number of seed per pod, 100 seed weight and seed yield, whereas the BARI Mung-2 showed the lowest value for all those parameter. BARI Mung-3 and BARI Mung-4 were in intermediate performance. It was also found that the BARI Mung-2 attained the highest abscission (%) whereas, the BARI Mung-S attained the lowest abscission (%) and BARI Mung-3 showed the second highest abscission (%). Form the overall results, it might be concluded that temperature had tremendous effect on germination characteristics and seed metabolic efficiency and therefore, BARI Mung-5 showed the best performance in SME, TDM, plant height, seed yield and yield contributing characteristics.