Abstract
Abstract Due to the high economic value of vegetables, farmers in China often apply more fertilizer than is required for plant growth. This leads to phosphorus accumulation in soils, which can pollute the aquatic environment. This conflict arises because vegetables often use nutrients inefficiently, and require high phosphorus levels in the growth medium. In this study, amaranth ( Amaranthus mangostanus L.) was grown in soils with 14.7, 23.8, 45.3, 54.6, 74.2, 101 or 116 mg Olsen‐P/kg, and with and without phosphorus fertilizer (175 mg P/kg or equivalent to 385 kg P/ha). The yield of amaranth was positively correlated with soil Olsen‐P content. CaCl 2 ‐P content was positively correlated with Olsen‐P content and CaCl 2 ‐P markedly increased at Olsen‐P contents exceeding 53.8 mg P/kg in the pot experiment or 55.9 mg P/kg in the field survey. These values were regarded as the ‘change points’ for phosphorus loss; to achieve 85 or 95% of maximum amaranth yield, the amaranth crop required 91or 101 mg Olsen‐P/kg soil, respectively, and application of 175 mg P/kg was still able to significantly increase amaranth yield at an Olsen‐P level of 74.2 mg P/kg soil. These results indicated that the phosphorus requirement of amaranth exceeded the ‘change point’ (53.8 or 55.9 mg Olsen‐P/kg); the C min (minimum concentration in the media at which no net influx occurs) of phosphorus for 3‐week‐old amaranth was 1.55 μ m . This value is much higher than that reported for other crops, and may explain the inefficient P use of amaranth. The high C min value also indicates that the phosphorus requirement of amaranth is beyond the ‘change point’ of P loss.
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Claims 8
Claim · model-written summary
Amaranth yield was positively correlated with soil Olsen-P content.
- Taxon
- amaranth
.JPG?width=60)
Amaranthus caudatuse1 - Treatment
- soil Olsen‐P contente1
- Outcome
- yielde1
- Direction
- positively correlatede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
t0“Amaranthus mangostanus L.”
e1“The yield of amaranth was positively correlated with soil Olsen‐P content”
Claim · model-written summary
CaCl2-P content was positively correlated with Olsen-P content in soil.
- Taxon
- Amaranthus mangostanus
_01.jpg?width=60)
Amaranthus tricolort0 - Treatment
- Olsen‐P contente0
- Outcome
- CaCl 2 ‐P contente0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_01.jpg?width=500)
Verbatim
t0“Amaranthus mangostanus L.”
e0“CaCl 2 ‐P content was positively correlated with Olsen‐P content”
Claim · model-written summary
CaCl2-P markedly increased at Olsen-P contents above 53.8 mg P/kg in the pot experiment and 55.9 mg P/kg in the field survey.
- Taxon
- Amaranthus mangostanusAmaranthus tricolort0
- Treatment
- Olsen‐P contents exceeding 53.8 mg P/kge2
- Outcome
- CaCl 2 ‐Pe2
- Direction
- markedly increasede2
- Value
- 53.8 mg P/kge2
- Setting
- pot experimente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Amaranthus mangostanus L.”
e2“CaCl 2 ‐P markedly increased at Olsen‐P contents exceeding 53.8 mg P/kg in the pot experiment or 55.9 mg P/kg in the field survey”
Claim · model-written summary
Amaranth needed 91 or 101 mg Olsen-P/kg soil to reach 85 or 95% of maximum yield.
- Taxon
- amaranthAmaranthus caudatuse3
- Outcome
- maximum amaranth yielde3
- Value
- 91or 101 mg Olsen‐P/kg soile3
- Qualifier
- to achieve 85 or 95%e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Amaranthus mangostanus L.”
e3“to achieve 85 or 95% of maximum amaranth yield, the amaranth crop required 91or 101 mg Olsen‐P/kg soil”
Claim · model-written summary
Applying 175 mg P/kg significantly increased amaranth yield at an Olsen-P level of 74.2 mg P/kg soil.
- Taxon
- amaranthAmaranthus caudatuse4
- Treatment
- application of 175 mg P/kge4
- Outcome
- amaranth yielde4
- Direction
- significantly increasee4
- Qualifier
- at an Olsen‐P level of 74.2 mg P/kg soile4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“application of 175 mg P/kg was still able to significantly increase amaranth yield at an Olsen‐P level of 74.2 mg P/kg soil”
Claim · model-written summary
The phosphorus requirement of amaranth exceeds the change point for P loss.
- Taxon
- amaranthAmaranthus caudatuse5
- Outcome
- phosphorus requiremente5
- Qualifier
- exceeded the ‘change point’e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Amaranthus mangostanus L.”
e5“the phosphorus requirement of amaranth exceeded the ‘change point’ (53.8 or 55.9 mg Olsen‐P/kg)”
Claim · model-written summary
The Cmin of phosphorus for 3-week-old amaranth was 1.55 µM, much higher than for other crops.
- Taxon
- amaranthAmaranthus caudatuse6
- Outcome
- C mine6
- Direction
- much highere7
- Value
- 1.55 μ me6
- Comparator
- other cropse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Amaranthus mangostanus L.”
e6“the C min (minimum concentration in the media at which no net influx occurs) of phosphorus for 3‐week‐old amaranth was 1.55 μ m”
e7“This value is much higher than that reported for other crops, and may explain the inefficient P use of amaranth”
Claim · model-written summary
The high Cmin of amaranth may explain its inefficient P use.
- Taxon
- amaranthAmaranthus caudatuse7
- Outcome
- inefficient P usee7
- Qualifier
- This value is much higher than that reported for other cropse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Amaranthus mangostanus L.”
e7“This value is much higher than that reported for other crops, and may explain the inefficient P use of amaranth”
The same questions in other papers
phosphorus · yield · Amaranthus caudatus (amaranth)Results agree
8 papers in the same direction as this paper
- positive
- positive
- positive
5 papers more in this group
See all 9 papers →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.