The Effect of Weed Control before Winter in Wheat Field

The wheat fields of six villages in Quzhou County,Hebei Province were chosen to conduct a survey aiming at understand the effect of weed control before winter in winter wheat field.The main varieties of wheat in each village were not all the same.The contrast test was adopted that using self-propelled mechanical spraying machine with tribenuron methyl 150-180 g / hm2 and water 450 kg / hm2 to spray pesticide in the middle of November,2013( one month after wheat seeding) and the fields that did not make any deal with as controls.Then the occurrence species and quantity of weeds in wheat field were investigated in March,2014.The results showed that Descurainia scphia was the main weed in the district and weed control before winter could greatly reduce the species,quantity and relative density of winter wheat field compared to the ordinary fields.The relative density of Descurainia scphia was also reduced.The weed control before winter has wide application and popularization prospect.