ABSTRACT The knowledge of the adequate period for beginning weed management in lettuce crop can increase efficiency production, reducing costs with management. aim this study was to determine pre-interference (PIP), critical time removal (CTWR) and control (CPWC) three cultivars, Elisa, Lucy Brown Solaris. Coexistence absence weeds were evaluated each cultivar. design randomized blocks seven tr...

Background Weed interference in the early stages of soybean development can compromise its yield. The use herbicides with residual effects at time sowing is an alternative to reduce weed density and emergence time, consequently, damage caused by their interference. Therefore, be reduced, which result easier post-emergence control. combination herbicide modes action extends spectrum control dela...

Redroot pigweed is one of the injurious agricultural weeds on a worldwide basis. Understanding of its interference impact in crop field will provide useful information for weed control programs. The effects of redroot pigweed on cotton at densities of 0, 0.125, 0.25, 0.5, 1, 2, 4, and 8 plants m(-1) of row were evaluated in field experiments conducted in 2013 and 2014 at Institute of Cotton Res...

The critical period for weed control (CPWC) is the period in the crop growth cycle during which weeds must be controlled to prevent unacceptable yield losses. Field studies were conducted in 2005 and 2006 in the University of Birjand at the south east of Iran to determine CPWC of corn using a randomized complete block design with 14 treatments and four replications. The treatments consisted of ...

Weed interference in annual cropping systems can be highly variable from year-to-year, as well as spatially heterogeneous. These factors have confounded efforts to develop simple methods for predicting competitive outcomes early in the growing season. A 2-year study was conducted with maize in competition with four annual weed species (Setaria faberi, Abutilon theophrasti, Chenopodium album and...