Abstract
Molybdenum (Mo) is required by the enzymes involved in many metabolic processes related to plant growth and development. However, the effects of Mo addition on plant growth and beneficial microorganisms in mixed grasslands are unclear. We conducted a greenhouse experiment to examine the effects of different Mo addition levels (10 and 20 mg Mo kg−1 soil in the form of Na2MoO4) on the growth of perennial ryegrass–white clover in two low-Mo soils, as well as their symbiotic microorganisms. Our results showed that the addition of Mo had a significant impact on plant growth in limestone soil but not in yellow loam soil (p < 0.05). Compared with no addition of Mo fertilizer in limestone soil, an addition of 10 mg Mo kg−1 significantly increased the plant community shoot and root biomass (p < 0.05). However, this improvement was not observed with an addition of 20 mg Mo kg−1. The shoot nitrogen and phosphorus content in both soil types was unaffected by the Mo addition (p > 0.05), whereas the 10 mg Mo kg−1 addition significantly increased the shoot nitrogen and phosphorus uptake in limestone soil (p < 0.05). This increase in plant community productivity was primarily due to the increased growth of both species, caused by the enhanced activation of the symbiotic rhizobium. We conclude that Mo supply may promote N utilization and uptake in mixed grassland by increasing the activity of symbiotic rhizobium, resulting in a higher yield of mixed grassland, which is critical for sustainable agricultural development in low-Mo soils.
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Claims 7
Claim · model-written summary
Mo addition significantly affected plant growth in limestone soil.
- Taxon
- perennial ryegrass–white clover
Trifolium repens
Lolium perennee1 - Treatment
- addition of Moe0
- Outcome
- plant growthe0
- Setting
- limestone soile0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the addition of Mo had a significant impact on plant growth in limestone soil but not in yellow loam soil (p < 0.05)”
e1“perennial ryegrass–white clover”
Claim · model-written summary
Mo addition did not significantly affect plant growth in yellow loam soil.
- Taxon
- perennial ryegrass–white cloverTrifolium repensLolium perennee1
- Treatment
- addition of Moe0
- Outcome
- plant growthe0
- Setting
- yellow loam soile0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the addition of Mo had a significant impact on plant growth in limestone soil but not in yellow loam soil (p < 0.05)”
e1“perennial ryegrass–white clover”
Claim · model-written summary
At 10 mg Mo kg−1 in limestone soil, shoot and root biomass increased significantly over no fertilizer.
- Taxon
- perennial ryegrass–white cloverTrifolium repensLolium perennee1
- Treatment
- 10 mg Mo kg−1e0
- Outcome
- plant community shoot and root biomasse0
- Direction
- increasede0
- Comparator
- no addition of Mo fertilizere0
- Setting
- limestone soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with no addition of Mo fertilizer in limestone soil, an addition of 10 mg Mo kg−1 significantly increased the plant community shoot and root biomass (p < 0.05).”
t0“Grass–Legume Mixtures”
e1“perennial ryegrass–white clover”
Claim · model-written summary
The biomass improvement was absent at 20 mg Mo kg−1.
Not reportedComparator
Verbatim
e0“However, this improvement was not observed with an addition of 20 mg Mo kg−1.”
t0“Grass–Legume Mixtures”
Claim · model-written summary
Mo addition did not significantly affect shoot nitrogen and phosphorus content in either soil.
- Taxon
- Grass–Legume Mixturest0
- Treatment
- Mo additione0
- Outcome
- shoot nitrogen and phosphorus contente0
- Direction
- unaffectede0
- Setting
- both soil typese0
Not reportedComparator
Verbatim
e0“The shoot nitrogen and phosphorus content in both soil types was unaffected by the Mo addition (p > 0.05)”
t0“Grass–Legume Mixtures”
e1“perennial ryegrass–white clover”
Claim · model-written summary
At 10 mg Mo kg−1, shoot nitrogen and phosphorus uptake increased significantly in limestone soil.
- Taxon
- Grass–Legume Mixturest0
- Treatment
- 10 mg Mo kg−1 additione0
- Outcome
- shoot nitrogen and phosphorus uptakee0
- Direction
- increasede0
- Setting
- limestone soile0
Not reportedComparator
Verbatim
e0“the 10 mg Mo kg−1 addition significantly increased the shoot nitrogen and phosphorus uptake in limestone soil (p < 0.05)”
t0“Grass–Legume Mixtures”
e1“perennial ryegrass–white clover”
Claim · model-written summary
Enhanced symbiotic rhizobium activation was attributed as the cause of increased growth of both species.
Verbatim
e0“increased growth of both species, caused by the enhanced activation of the symbiotic rhizobium”
t0“Grass–Legume Mixtures”
The same questions in other papers
molybdenum atom · growth · Trifolium repens (white clover)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.