Isoproturon plus 2,4-D yielded at par with weed-free barley.

2,4-D · yield · Hordeum vulgare (barley)Results differ

8 papers in the same direction as this claim · 7 in the opposite direction

1. negative
   Applying 2,4-D to barley at stage 11–18 reduced yield.

   Response of Barley to Herbicide Versus Mechanical Weed Control Under Semi‐Arid Conditions · 2002

   Opposite direction

2. no effect
   Grain yields were unaffected by both rates of 2,4-D.

   Tolerances of barley cultivars to post-emergence herbicides · 1986

   Opposite direction

3. negative
   Total dry matter yield of barley was slightly reduced by 2,4-D applied in spring prior to seeding.

   Effect of 2,4-D and Dicamba Residues on Following Crops in Conservation Tillage Systems · 1992

   Opposite direction

4. negative
   2,4-D decreased perfused-spike seed weight.

   Protein accumulation potential in barley seeds as affected by soil‐ and peduncle‐applied N and peduncle‐applied plant growth regulators · 1997

   Opposite direction

5. negative
   2,4‐D at BBCH 11–18 reduced barley yield in both seasons.

   Awnless barley (Hordeum vulgare L.) response to hand weeding and 2,4‐D application at two growth stages under Mediterranean environment* · 2002

   Opposite direction

6. negative
   2,4-D at late vegetative or double-ridge stage caused missing and branched spikes and altered spikelet arrangements in barley.

   Abnormalities of the growth point and ear of barley caused by 2,4-dichlorophenoxy acetic acid · 1989 · compared with normal alternate arrangement

   Opposite direction

7. no effect
   2, 4-D application had no significant effect on straw yield in wheat and barley.

   Tolerence of Wheat and Barley at Different Stages of Growth to 2, 4-D Sprays · 1970

   Opposite direction

8. positive
   The same medium and replenishment schedule was optimal for productivity at 67 calli per 100 anthers.

   Callus induction from barley microspores. The role of sucrose and auxin in a barley anther culture medium · 1985

   Same direction

7 papers more in this group

isoproturon · yield · Hordeum vulgare (barley)Results agree

5 papers in the same direction as this claim

1. positive
   Isoproturon with diflufinican herbicide gave 66.3 percent more grain yield than the weedy check.

   Nitrogen fertilizer levels and some weed control treatments effects on barley and associated weeds · 2010 · compared with weedy check

   Same direction

2. positive
   isoproturon 1000 g+metsulfuron 4 g/ha had highest barley grain yield.

   Studies on Efficacy of Tank Mix Herbicides for the Control of Weeds in Irrigated Barley (Hordeum vulgare L.) · 2009

   Same direction

3. positive
   Post-emergence isoproturon plus 2,4-D amine at 0.75 kg/ha (45 DAS) raised barley grain yield by 11.2 q/ha over the weedy control.

   Studies on Weed Management in Rainfed Barley (Hordeum vulgare) · 1995 · compared with weedy control

   Same direction

4. positive
   Isoproturon + metsulfuron 1.00 + 0.004 kg/ha gave grain yield 8.6 to 27.3% higher than the remaining herbicide treatments.

   Management of mixed weed flora in barley with tank-mix application of isoproturon with metsulfuron and 2,4-D · 2015 · compared with remaining herbicide treatments

   Same direction

5. positive
   Isoproturon plus metsulfuron gave significantly higher barley grain yield, equivalent to weed-free check.

   Evaluation of Herbicides for Enhancing Yield and Economic Benefits in Barley (Hordeum vulgare L.) · 2025 · compared with weed free check

   Same direction