<Li> Postemergence: These herbicides are applied after weed seedlings have emerged through the soil surface . They can be foliar or root absorbed, selective or nonselective, contact or systemic . Application of these herbicides is avoided during rain because the problem of being washed off to the soil makes it ineffective. 2, 4 - D is a selective, systemic, foliar absorbed postemergence herbicide . </Li> <Ul> <Li> Soil applied: Herbicides applied to the soil are usually taken up by the root or shoot of the emerging seedlings and are used as preplant or preemergence treatment . Several factors influence the effectiveness of soil - applied herbicides . Weeds absorb herbicides by both passive and active mechanism . Herbicide adsorption to soil colloids or organic matter often reduces its amount available for weed absorption . Positioning of herbicide in correct layer of soil is very important, which can be achieved mechanically and by rainfall . Herbicides on the soil surface are subjected to several processes that reduce their availability . Volatility and photolysis are two common processes that reduce the availability of herbicides . Many soil applied herbicides are absorbed through plant shoots while they are still underground leading to their death or injury . EPTC and trifluralin are soil applied herbicides . </Li> <Li> Foliar applied: These are applied to portion of the plant above the ground and are absorbed by exposed tissues . These are generally postemergence herbicides and can either be translocated (systemic) throughout the plant or remain at specific site (contact). External barriers of plants like cuticle, waxes, cell wall etc. affect herbicide absorption and action . Glyphosate, 2, 4 - D and dicamba are foliar applied herbicide . </Li> </Ul> <Li> Soil applied: Herbicides applied to the soil are usually taken up by the root or shoot of the emerging seedlings and are used as preplant or preemergence treatment . Several factors influence the effectiveness of soil - applied herbicides . Weeds absorb herbicides by both passive and active mechanism . Herbicide adsorption to soil colloids or organic matter often reduces its amount available for weed absorption . Positioning of herbicide in correct layer of soil is very important, which can be achieved mechanically and by rainfall . Herbicides on the soil surface are subjected to several processes that reduce their availability . Volatility and photolysis are two common processes that reduce the availability of herbicides . Many soil applied herbicides are absorbed through plant shoots while they are still underground leading to their death or injury . EPTC and trifluralin are soil applied herbicides . </Li> <Li> Foliar applied: These are applied to portion of the plant above the ground and are absorbed by exposed tissues . These are generally postemergence herbicides and can either be translocated (systemic) throughout the plant or remain at specific site (contact). External barriers of plants like cuticle, waxes, cell wall etc. affect herbicide absorption and action . Glyphosate, 2, 4 - D and dicamba are foliar applied herbicide . </Li>

Give the name and chemical composition of two herbicides