The weed control has been practiced since the time immemorial by manual labour and/or animal drawn implements, but these practices were laborious, tiresome and expensive due to increasing cost of labour. Weed management increases the cost of production and thus it is necessary to device such methods which could reduce not only the cost of production but also save time and labor. Among the weed control methods, the chemical control is the easiest one of the recent origins, and the most successful alternative method. Chemical weed control enables farmers to obtain higher yields per unit area with an over all lower production cost. The chemical method of weed control can provide us abrupt and promising results. Herbicides are a quick tool to control dense weed populations. Moreover, the control is more effective as the weeds even within the rows are killed which invariably escape, because of morphological similarity to wheat, during mechanical control. Selective herbicides reduce the need for hand weeding.

The effectiveness of herbicides is affected by time, rate and method of application. Out of total import of herbicides worth Rs. 2.2 billion, 63% were used on wheat alone during 2004 in Pakistan. Herbicides are frequently used to increase crop yield through effective weed control, but excessive and nonjudicious use of herbicides has posed many environmental and health problems . According to an international survey, over 295 biotypes of 177 weed species have evolved resistance to herbicides . These environment and health hazards and resistance development issues, therefore, have forced to develop some environment friendly technologies for weed control . Chemical weed control is more economical than conventional method . Reports are available on the efficacy of different herbicides in wheat . Puma Super 75 EW and Topik 15 WP are most commonly used narrow-leaved herbicides in the region but there are several reservations on the use of these herbicides as high application often involves the heavy expenditures and causes environmental hazard in addition to adverse affects on wheat crop. Similarly,cannabis grow tray low application could result the problem of low or no control of weeds and weed resistance etc. The herbicide use in Pakistan is not widely practiced as in the agriculturally advanced nations. The interest around the testing of graminicides indicates the problem posed by grasses whereas, the studies of Khan  showed synergistic response on combined use.

In another studies researchers obtained an effective control of weeds in wheat through chemicals . The objectives of the present studies were to determine the efficacy of different most effective and economical herbicides as compared to hand weeding in controlling weeds and to detect their effect on the yield and yield components of wheat crop under conditions of Pakistan. 2. Materials and Methods The experiment was conducted at Agricultural Extension Farm, Dargai, KPK during 2008-2009. The experiment was laid out in a randomized complete block design  design with five replications. Row to row distance was kept at 25 cm apart. All the herbicides were applied as post emergence as presented in Table 1. All the herbicides were applied with the help of a knapsack sprayer 20 days after sowing when the wheat crop was in the 5 – 6 leaf stage. Different herbicides rates were determined in terms of active ingredient or acid equivalent per acre treated, or as pounds or volume of commercial product per acre. Active ingredient indicates the amount of non-acid herbicide in a formulation. Acid equivalent indicates the amount of an acid herbicide in a formulation. Different weeds present at the time of herbicides application were Convolvulus arvensis, Avena fatua, Phalaris minor, Gallium aparine, Fumaria indica and Melilotus indica, etc. To avoid any misuse of the herbicides all the precautionary measures were taken to spray them successfully. The data were recorded on the parameters fresh weed biomass , weed control efficiency , number of tillers·m–2, thousand grain weight , biological yield  and grain yield . The prosperity of our people depends to a large extent on good wheat harvests.Weeds reduce the crop yield, deteriorate the quality of farm produce and hence reduce the market value of wheat. The control of weeds is basic requirement and major component of management in the production system.The chemical control method is one of the recent origins, which is being emphasized in modern agriculture.Furthermore, if the chemical control is tested in areas where wheat is intercropped with sugarcane, it may provide fruitful results .