ALLELOPATHIC EFFECT OF FOUR AGROFORESTRY TREE SPECIES ON THE GERMINATION AND GROWTH OF TWO WHEAT VARIETIES

Abstract

An experiment was conducted at the research field of Agroforestry and Environment Department, Hajee Mohammad Danesh Science and Technology University, Bangladesh during the period of November 2016 to March 2017 to find out the allelopathic effect of four tree species on the germination, root architecture, shoot growth and yield of two wheat varieties (BARI Gom-27 and BARI Gom-28). There were five treatments including control viz. T1 (Ghora neem tree leaf), T2 (Ipil- ipil tree leaf), T3 (Mango tree leaf), T4 (Sada koroi tree leaf) and T5 (only water; Control). There were two experiments; Experiment-1 was done in laboratory condition to test the allelopathic effect of four tree species on the germination of tested wheat varieties in Petridis and Experiment-2 was done in field condition to find out the allelopathic effect of trees on the germination, growth root architecture and yield. The concentration used in the laboratory experiment for each dry leaf powder was 5%. In case of field experiment 20g dry leaf powder were mixed in each experimental plot of size 1.5ft × 1.5ft. In case of laboratory experiment, germination percentage of BARI Gom-27 was highest (95%) in Control condition followed by Sada koroi leaf extract (60%), Mango leaf extract (40%), Ipil-ipil leaf extract (45%) and lowest percentage (20%) was found in Ghora neem leaf extract. In the same way, in case of BARI Gom- 28, the highest germination percentage (90%) was recorded in Control treatment, followed by Sada koroi leaf extract (39%), Ipil ipil leaf extract (33%), Mango leaf extract (30%) and lowest (21%) was recorded in Ghora neem leaf extract. Again in field experiment, BARI Gom-27 gave the highest (88.16%) germination in Control treatment followed by Ipil-ipil tree leaf extract (84.1%), Mango tree leaf extract (82.36%), Sada koroi leaf extract (78.88%) and lowest germination percentage (77%) was found in Ghora neem leaf extract. Likewise, germination percentage of BARI Ghom-28 was found highest (85.26%) in Control and lowest (73.66%) was found in Sada koroi leaf extract. In BARI Gom-27, the highest yield (2047.61kg/ha) was observed in Control followed by Sada koroi leaf extract (1666.67 kg/ha), Ipil-ipil leaf extract (1380.09 kg/ha), Mango leaf extract (1238.09 kg/ha) and lowest (1000 kg/ha) was in Ghora neem leaf extract. In the same way in case of BARI Gom-28 the highest (1857.14 kg/ha) yield was recorded in Control followed by Sada koroi leaf extract (1523.81 kg/ha), Ipil-ipil leaf extract (1285.71kg/ha), Mango leaf extract (1190.47 kg/ha) and lowest (1095.23 kg/ha) was in Ghora neem leaf extract. Finally it can be concluded that among the two wheat varieties, BARI Gom-27 gave good result in respect to the allelopathic of the tested four tree species. Among the four tested tree species, Sada koroi leaf extract was less allelopathic effect on wheat. So, BARI Gom-27 can be cultivated in association with Sada koroi tree. I think both BARI Gom-27 and 28 can be growth under sada koroi because 1.6 t/ha in 27 1.5 t/ha in statistically no difference.