A field experiment was conducted at the experimental field of Sher-e-Bangla Agricultural University
during August to December 2012 to find out the effect of plant extracted pyroligneous acid (vinegar
like substance extracted from wood) with trade name PRH on T. aman rice (BRRI dhan34). There
were six treatments viz., Control (no fertilizer and no PRH); 100% recommended dose of fertilizer;
100% recommended dose of fertilizer plus 100% PRH; 50% recommended dose of fertilizer plus 50%
PRH; 50% recommended dose of fertilizer plus 100%PRH; and no fertilizer but 100% PRH. Results
showed that at harvest the highest plant height was obtained from 100% recommended dose of fertilizer
application, whereas the lowest from control (no fertilizer + no PRH). The highest tillers hill -1 was obtained
from 50% recommended dose of fertilizer + 50% PRH application and the lowest from control (no fertilizer
+ no PRH) but the highest effective tillers hill-1 was obtained from 100% recommended dose of fertilizer
application and the lowest from control (no fertilizer + no PRH). Grain yield was significantly the highest
(5.05 t ha-1) with 50% recommended dose of fertilizer + 50% PRH, whereas the lowest (2.55 t ha-1) yield
was obtained from control (no fertilizer + no PRH). The higher grain yield was attributed mainly due to
highest number of effective tillers hill-1, filled grains panicle-1 and 1000-grain weight obtained from
50% recommended dose of fertilizer + 50% PRH.