According to the herbicide used to kill grass characteristic selection period

Chemical herbicides have different biological activity and herbicidal methods, therefore, must make good use of its features herbicides, in order to obtain the desired control effect.

Such as: acetochlor: amide herbicides to absorb coleoptile main control annual grass weeds and some broadleaf weeds in small grain seed, closed with a certain role. After sowing in wheat crop soil to stand needle enclosed use, the herbicidal effects influenced by soil moisture, drought conditions not conducive to the efficacy of the play,pressure sprayers the herbicidal effect is poor, when the rain water in field after application when they prone to injury.

Isoproturon: herbicides, some of the main controlling grass weeds and some broadleaf weeds (good effect on the chickweed), preemergence, postemergence can use, but early postemergence use works best. In wheat (barley) after sowing bud to 4 leaf stage. Isoproturon efficacy of play is also affected by the impact of soil moisture, drought conditions using ineffective, postemergence than preemergence use.
Fenoxaprop, alkynyl oxalic acid, both foliar treatment agent, no closure effect, which can only be carried out after a homogeneous weed foliage treatment.

Tribenuron: herbicides, in order to absorb the main stem, the role of both closed, the main control broadleaf weeds in the 3-4 leaf stage of weed works best. Because of its dead grass is slower, in order to expand the spectrum herbicide, dead grass to improve the speed, multi-yl grass with ketones, MCPA ,2.4-D, Fluoroglycofen ether compound used.

Azole oxadiazon: leaf contact insecticide, no sucking conductivity, for the control of broadleaf weeds, when a large amount of wheat leaves burns phenomenon, dead grass fast, but weeding recur, and for chickweed, large nest vegetables less effective, with tribenuron, MCPA and other compound used in the 3-4 leaf stage of weeds best.

Glyphosate is the uptake and Herbicide. Can use its uptake, 5-7 days before the grain filling fruit tree sprayers spraying, control wheat reed good effect, no influence on the grain filling.