Increasing soil phosphorus content increased spring barley yield while it had no effect on grass yield
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The study investigates the effects of soil phosphorus (P) content on the yield of spring barley and grass, revealing that barley is more sensitive to P shortages than grasses. Higher soil P statuses significantly increased barley yields, with a 27% increase in high P soils compared to low P soils, while grass yields remained unaffected by both P fertilization and soil P status. The findings suggest that specific P requirements for barley must be considered in grass rotations, particularly in varying soil P conditions.
Increasing soil phosphorus content increased spring barley yield while it had no effect on grass yield
- 1. Increasing soil phosphorus content increased spring barley yield while it had no effect on grass yield Louhisuo, A., Termonen, M., Järvenranta, K. and Virkajärvi, P. / Natural Resources Institute Finland (Luke) Spring barley is more sensitive to P shortage than grasses Unique experiment field with low, medium and high soil P statuses However, the interaction between P fertilisation and soil P status with perennial grass yield and spring cereal yield response is unclear. Figure 1. Cumulative barley yields (15% moisture, kg ha-1) in low, medium, and high soil P statuses on average (mean, n = 12) and using P fertiliser levels 0, 10, 20, and 40 kg P ha-1 year-1 (0P, 10P, 20P, and 40P; n = 3). Means of each P status (bold letters) and means of each P fertiliser level on each P status separately marked with a different letter differ significantly at p ≤ 0.05 (Tukey’s test). Error bars are standard error of means (SEM). FOMARE project arja.louhisuo@luke.fi Conclusion: In grass rotations including barley, barley’s specific P requirements should be considered. Barley yield increased in high P status soil Grass cumulative DMY from 2021 to 2023 was 27,970 kg ha-1 (7,890 + 10,570 + 9,510 kg DM ha-1 respectively), and it remained unaffected by P fertilisation or soil P status. Barley yields reacted significantly to the soil P status. A high soil P status yielded 27% higher cumulative grain yield than a low soil P status (Figure 1). In the low soil P status, 20P and 40P produced 19% and 24% higher cumulative yields than 0P fertilisation, respectively. No P fertilisation effect on cumulative yield was observed in medium and high soil P statuses. The P balance of grass was highly negative and despite a positive P balance in barley and in fertilisation treatment 40P, the difference in PAAC between 2023 and 2020 remained negative in all treatments. The site: Clay field in Central Finland in 2020–2023 Experiment design: a Latin square (3 P status*3 replicates) in low, medium and high P statuses Plots: The main plot was the soil P status, the sub-plot was the plant (timothy ley and spring barley), the sub-sub- plot was the mineral P fertiliser application (0, 10, 20, and 40 kg P ha-1 year-1 Analyses: Grass dry matter yield (DMY), grain yield and yield P concentration of each harvest. Soil P in acid ammonium acetate extraction (PAAC, pH 4.65) in 2020 and 2023. P balance was determined by the difference between P fertilisation and P uptake. a P values: P status 0.033, P fert. 0.056, Interaction 0.028 a ab b a ab b b a a a a a a a a The General Meeting of the European Grassland Federation 9-13 June, 2024 Leeuwarden, The Netherlands