Increasing ammonium relative to nitrate increased floral tiller number by up to 55%.

nitrogen · yield · LoliumPositive and negative results

41 papers in the same direction as this claim · 10 in the opposite direction · 2 reporting no difference from an alternative

1. no effect
   Nitrogen alone did not significantly increase ryegrass yield.

   SEED PRODUCTION STUDIES ON PERENNIAL RYEGRASS, TIMOTHY AND PRAIRIE GRASS · 1975

   Opposite direction

2. negative
   Low-rate urea without DMPP had the lowest annual pasture dry matter yield.

   Tropical dairy pasture yield and nitrogen cycling: effect of urea application rate and a nitrification inhibitor, DMPP · 2016

   Opposite direction

3. no effect
   Compost with complete fertilizer or urea did not affect ryegrass dry matter production or nutrient uptake.

   Use of urea to correct immature Urban composts for agricultural purposes · 2000

   Opposite direction

4. negative
   Divided broadcast urea dressings yielded slightly less than equivalent Nitro-Chalk dressings.

   Comparison of the effects of aqueous and of prilled urea, used alone or with urease or nitrification inhibitors, with those of ‘Nitro-Chalk’ on ryegrass leys · 1984 · compared with equivalent dressings of ‘Nitro-Chalk’

   Opposite direction

5. negative
   Low N without clover yielded substantially less than all other treatments, a consistent N × clover interaction.

   Implications of grass‐clover interactions in dairy pastures for forage indexing systems. 4. Canterbury · 2018 · compared with all other treatments

   Opposite direction

6. no effect
   In mixture, S.23 did not yield more than the survivor population at lower nitrogen rates.

   Ryegrass populations from intensively managed leys: II. Reaction to nitrogen and Poa trivialis L. · 1971 · compared with survivor

   Opposite direction

7. no effect
   Grass yields under the two N fertilizers were similar across pH 4·3 to 7·4.

   Controlling soil pH with different N-fertilizers in experiments with ryegrass in pots · 1971

   Opposite direction

8. no effect
   Annual and perennial ryegrass had similar yield responses to applied nitrogen.

   Herbage production and the accumulation of soil nitrogen under irrigated pastures on the Riverine Plain · 1974 · compared with Annual and perennial ryegrasses

   Opposite direction

45 papers more in this group