Impact of some soil herbicides as pre-emergence and pre-planting application on sorghum (Sorghum Bicolor L. ) productivity and associated weeds [electronic resource].

Includes bibliographic reference

Two field experiments were conducted during two successive seasons (2018 and 2019), at Sids
Agricultural Research Station, Bani Swif, Egypt, to evaluate efficacy and selectivity of some soilapplied
herbicides (Butralin at 120 g, Pendimethalin at 773.5 g and Acetochlor at 840 g a.i. fed.). In
addition, hand hoeing (twice) and weed check (control), under influence of different application
methods as pre-emergence (experiment 1) or pre-planting (experiment 2) on vegetative growth and
grain sorghum were simultaneously examined. Each experiment was laid out in a Randomized
Complete Blocks Design, with four replicates. The results showed that there was no difference on
efficacy of weed control between two application methods of soil-herbicides whereas there was
satisfactory controlling effect of total weeds in both seasons. Also, the results revealed that in the preemergence
application gave the highest injury in vegetative growth, which were inversely related
between the vegetative growth and yield and its components. Whereas the increasing reduction in
number of plants/plot, yield and its components decreased. On the contrary, in pre-planting application
there was no adverse effect on vegetative growth, rather there was a positive correlation, whereas
increases in number of plants/plot, yield and its components increased, in both seasons. Generally, it is
concluded that, sorghum vegetative growth, yield and its components were not affected by these
herbicides, so that appear to have good potential for controlling effect on weeds and selectivity of
grain sorghum when applied pre-planting (14 days from application) but (pre-emergence) is risky.

Key words: Sorghum (Sorghum bicolor (L.) Moench), Soil-applied Herbicide, Pre-emergence, Preplanting, Herbicide residue, Weed control.

Summary in Arabic