Selective allelopathic character of sorghum water extract alone and in combination with two herbicides was explored for
controlling weeds in mungbean. Two hand weedings reduced dry weight of all weeds by 79% (maximum) which was at par
with combined pre-em sprays of s. metolachlor @ 1.15 kg a.i. ha-1+sorgaab (conc.) @ 10 L ha-1 (78%) and Pendimethalin @
165 g a.i. ha-1+sorgaab (conc.) @ 10 L ha-1 with 78 and 75% weed dry weight reduction, respectively, over control. Maximum
plant height and number of grains per pod were recorded in plots with two hand hoeings at 15 and 30 days after sowing (DAS)
and were at par with s. metolachlor @ 2.3 kg a.i. ha-1 and Pendimethalin @ 330 g a.i. ha-1 alone and with combination of both
of these herbicides @ 1.15 kg and 165 g a.i. ha-1, respectively with sorgaab. Hand hoeing also resulted in highest 1000-grain
weight and was followed by Pendimethalin @ 165 g a.i. ha-1+sorgaab (conc.) @ 10 L ha-1 that was at par with s. metolachlor
alone @ 2.3 kg a.i. ha-1 and @ 1.15 kg a.i. ha-1 in combination with sorgaab. The economic analysis of weed management
strategies revealed that two hand weedings at 15 and 30 DAS gave the maximum net benefits (Rs. 20404.13 ha-1) and was
followed by s. metolachlor @ 1.15 kg a.i. ha-1+sorgaab (conc.) @ 10 L ha-1 and Pendimethalin @ 165 g a.i. ha-
1
+sorgaab (conc.) @ 10 L ha-1 with net benefit of Rs.19111.42 and 18460.57 ha-1, respectively. However, the marginal analysis
showed that pre-em spray of sorgaab (conc.) @ 10 L ha-1 with Pendimethalin @ 165 g a.i. ha-1 and s. metolachlor @ 1.15 kg
a.i. ha-1 gave 6891 and 149% marginal rate of returns, respectively. Other treatments gave either lower marginal rates of return
or were dominated due to higher costs involved.