Two-way NxP fertilisation experiment on barley (Hordeum vulgare) reveals shift from additive to synergistic N-P interactions at critical phosphorus fertilisation level
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In: Frontiers in Plant Science, Vol. 15, 1346729, 05.03.2024.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Two-way NxP fertilisation experiment on barley (Hordeum vulgare) reveals shift from additive to synergistic N-P interactions at critical phosphorus fertilisation level
AU - Clayton, Jessica
AU - Lemanski, Kathleen
AU - Solbach, Marcel Dominik
AU - Temperton, Vicky M.
AU - Bonkowski, Michael
N1 - Publisher Copyright: Copyright © 2024 Clayton, Lemanski, Solbach, Temperton and Bonkowski.
PY - 2024/3/5
Y1 - 2024/3/5
N2 - In a pot experiment, we investigated synergistic interaction of N and P fertilisation on barley biomass (Hordeum vulgare) on both shoot and root level with the aim to determine whether N-P interaction would be the same for all levels of N and P fertilisation. We further aimed to determine whether there was a critical level of N and/or P fertilisation rate, above which, a decrease in resource allocation to roots (as nutrient availability increased) could be demonstrated. Barley plants were grown from seed on a nutrient poor substrate and subjected to a two-way NxP fertilisation gradient using a modified Hoagland fertilisation solution. We observed N-P interactions in shoot and root biomass, and N and P use-efficiencies. A synergistic response in biomass was observed only above a critical level of P fertilisation when P was not limiting growth. Furthermore, we found that the same incremental increase in N:P ratio of applied fertiliser elicited different responses in shoot and root biomass depending on P treatment and concluded that barley plants were less able to cope with increasing stoichiometric imbalance when P was deficient. We provide, for the first time, stoichiometric evidence that critical levels for synergistic interactions between N-P may exist in crop plants.
AB - In a pot experiment, we investigated synergistic interaction of N and P fertilisation on barley biomass (Hordeum vulgare) on both shoot and root level with the aim to determine whether N-P interaction would be the same for all levels of N and P fertilisation. We further aimed to determine whether there was a critical level of N and/or P fertilisation rate, above which, a decrease in resource allocation to roots (as nutrient availability increased) could be demonstrated. Barley plants were grown from seed on a nutrient poor substrate and subjected to a two-way NxP fertilisation gradient using a modified Hoagland fertilisation solution. We observed N-P interactions in shoot and root biomass, and N and P use-efficiencies. A synergistic response in biomass was observed only above a critical level of P fertilisation when P was not limiting growth. Furthermore, we found that the same incremental increase in N:P ratio of applied fertiliser elicited different responses in shoot and root biomass depending on P treatment and concluded that barley plants were less able to cope with increasing stoichiometric imbalance when P was deficient. We provide, for the first time, stoichiometric evidence that critical levels for synergistic interactions between N-P may exist in crop plants.
KW - barley
KW - critical P level
KW - fertilisation
KW - N-P interactions
KW - nutrient limitation
KW - shoot:root ratio
KW - stoichiometry
KW - synergistic effects
KW - Ecosystems Research
UR - http://www.scopus.com/inward/record.url?scp=85188544684&partnerID=8YFLogxK
U2 - 10.3389/fpls.2024.1346729
DO - 10.3389/fpls.2024.1346729
M3 - Journal articles
C2 - 38504892
AN - SCOPUS:85188544684
VL - 15
JO - Frontiers in Plant Science
JF - Frontiers in Plant Science
SN - 1664-462X
M1 - 1346729
ER -