Maximum yield with rock phosphate was generally 88-100% of that with superphosphate.

phosphorus · yield · Trifolium subterraneumResults differ

2 papers in the same direction as this claim · 16 in the opposite direction

1. positive
   Superphosphate application improved the productivity of subterranean clover and the amounts of N2 fixed, inconsistently across sites and years.

   Effect of pasture management on the contributions of fixed N to the N economy of ley-farming systems · 1997

   Opposite direction

2. positive
   Increasing phosphate supply increased total dry weight in each clover experiment.

   Physiological and ecological studies on the oestrogenic isoflavones in subterranean clover ( T. subterraneum L.). II. Effects of phosphate supply · 1966

   Opposite direction

3. positive
   Contaminant zinc in superphosphate raised subterranean clover dry matter yield from 2300 to 3200 lb per acre.

   Pasture responses to traces of zinc in phosphate fertilizers · 1965

   Opposite direction

4. positive
   Superphosphate increased total pasture production.

   The short-term effects of rock phosphate and super-phosphate on a subterranean clover pasture. · 1955

   Opposite direction

5. positive
   Phosphorus increased seasonal pasture production by up to 3,200 lb dry matter per acre.

   Assessment of the phosphorus and sulphur status of subterranean clover pastures. 1. Environmental factors and pasture responses · 1969

   Opposite direction

6. positive
   Rock phosphate and superphosphate were equally effective at increasing clover dry matter yield at matched phosphorus additions in the application year.

   Rock phosphate and superphosphate as sources of phosphorus for subterranean clover on an acid sandy soil · 1974 · compared with superphosphate

   Opposite direction

7. positive
   Trifolium subterraneum yield increased two to three fold with phosphorus addition.

   The phosphate response of eight Mediterranean annual and perennial legumes · 1981

   Opposite direction

8. positive
   Nutrient addition significantly improved dry herbage yields by factors of 1.3, 1.7 and 1.4 at the 10-, 20- and 40-year-old sites.

   Effect of soil acidity and nutrient deficiencies on the growth and persistence of subterranean clover in pastures grown on sandy soils near Esperance, Western Australia · 1985

   Opposite direction

10 papers more in this group

phosphorus · yield · Hordeum vulgare (barley)Results differ

8 papers in the same direction as this claim · 71 in the opposite direction

1. positive
   Nitrogen and phosphorus fertilizer increased grain yield at all sites and years.

   Growth, water use and yield of barley in Mediterranean-type environments · 1987

   Opposite direction

2. positive
   phosphate dependent upon nitrite production in intact barley aleurone tissue.

   Control of Nitrate Reductase Activity in Barley Aleurone Layers · 1970

   Opposite direction

3. positive
   Barley production responded positively to nitrogen or phosphorus in 74 trials.

   Site-factor Influence on Barley Response to Fertilizer in On-farm Trials in Northern Syria: Descriptive and Predictive Models · 1992

   Opposite direction

4. positive
   Phosphorus significantly increased fertile tiller number in barley.

   Effects of Nitrogen and Phosphorus Fertilizer Levels on Growth and Development of Barley (Hordeum vulgare L.) at Bore District, Southern Oromia, Ethiopia · 2014

   Opposite direction

5. positive
   Barley grain yield increased progressively with increasing lime and phosphorus application.

   Effect of lime and phosphorus fertilizer on acid soil properties and barley grain yield at Bedi in Western Ethiopia · 2017

   Opposite direction

6. positive
   Incorporating P and K into the subsoil further increased barley yield by 20%, in addition to the effect of subsoiling.

   The effects of subsoiling and deep incorporation of P and K fertilizers on the yield and nutrient uptake of barley, potatoes, wheat and sugar beet grown in rotation · 1979

   Opposite direction

7. positive
   Grain yield of Lofa and Salka was only 10% lower under moderate P deficiency than under adequate P supply.

   Root length and phosphorus uptake by four barley cultivars grown under moderate deficiency of phosphorus in field experiments · 1987 · compared with adequate supply of P

   Opposite directionAbout lacking this nutrient, so it counts the other way round

8. positive
   About 10 mg/kg P eliminated the eroded versus non-eroded yield difference.

   Influence of topsoil removal on soil fertility and barley growth · 1994 · compared with eroded and non-eroded soil

   Opposite direction

71 papers more in this group

phosphorus · yield · x Triticosecale (triticale)Positive and negative results

1 paper in the same direction as this claim · 7 in the opposite direction

1. positive
   Combined NPK fertilization gave the maximum grain yield of 4.0 t/ha.

   Impact of Nitrogen and Phosphorus on Grain Yield in Winter Triticale Grown on Degraded Vertisol · 2020

   Opposite direction

2. positive
   The combination of N, P and K (80 kg N, 60 kg P2O5 and 60 kg K2O per ha) gave the highest grain yield.

   EFFECTS OF FERTILIZATION ON YIELD AND GRAIN QUALITY IN WINTER TRITICALE · 2014

   Opposite direction

3. positive
   Phosphorus deficiency with no P application severely reduced the achievable grain yield, to 43% of it.

   Phosphorus use efficiency, grain yield, and quality of triticale and durum wheat under irrigated conditions. · 2002

   Opposite directionAbout lacking this nutrient, so it counts the other way round

4. positive
   Fertilizer N and P increased output, sometimes doubling yields with modest inputs.

   Potential for Adopting Triticale in Morocco · 1992

   Opposite direction

5. positive
   A 24 kg/ha NPK application increased triticale productivity by 2-6%.

   SHORT CROP ROTATION PRODUCTIVITY WITH ADAPTIVE AGRICULTURAL TECHNOLOGIES · 2020

   Opposite direction

6. positive
   Knjaz had its highest grain yield under NP fertilization.

   The influence of mineral nutrition system to grain yield of winter triticale · 2004

   Opposite direction

7. positive
   Phosphorus–potassium fertilizers provided a grain yield increase of 0.30–0.32 t/ha.

   Spring triticale productivity at different doses of nitrogen fertilizers · 2022

   Opposite direction

8. negative
   N30 at tillering without phosphorus gave the greatest fertilizer return of 10.2-10.4 kg grain per kilogram active matter.

   The effect of nitrogen fertilizers on productivity of spring triticale in the dry steppe zone of Kazakhstan · 2018

   Same directionAbout lacking this nutrient, so it counts the other way round