Abstract:
Two years experiments were conducted using randomized complete block (RCB) design, having eight treatments, replicated four times to find their impact on maize, parthenium and associated weeds. The treatments consisted of 6 herbicides, viz., Aatrax (atrazine) @ 1.0, Buctril super (bromoxynil+MCPA) 60 EC@ 0.80, Dual gold (s-metolachlor) 960 EC @ 1.92, Sencor extra (metribuzin) @ 2.0, Primextra gold 720 SC (atrazine+s-metolachlor), @ 1.50 Stomp (pendimethalin) 330 EC @ 1.50 kg. a.i. ha-1, hand weeding and a control. Data showed that weed density was significantly influenced by application of various herbicides in maize. Fresh weed biomass (g m-2) was reduced in plots where Primextra gold and Dual gold were sprayed followed by hand weeding. Weed mortality (%) was significantly influenced by application of different herbicides, whereas year effect remained similar for weed mortality. Higher weed mortality was observed in Primextra gold treated plots, followed by hand weeding and Dual gold which were statistically at par. Long
stature maize plants were recorded in hand weeding and Primextra gold treated plots, whereas short stature plants were found in control plots. Number of grains ear-1 was significantly increased by application of herbicides and higher numbers of grains were recorded in Primextra gold and hand weeded plots. Thousand grain weight was significantly increased by herbicides and hand weeding. Application of herbicides significantly influenced biological and grain yields of maize. The effect of year was found non-significant for both grain and biological yields. Control plots resulted in lower grain and biological yield. Overall results indicated that application of Primextra gold as pre-emergence could provide good control of parthenium weed and associated weeds in maize.
