Abstract
Abstract Soybeans ( Glycine max L.) fertilized with either NH 4 ‐N or NO 3 ‐N were grown in a growth chamber using soil with four different initial pH levels. Liming the soil used in this research to increase pH decreased the P level in solution. Fertilization of soybeans with NH 4 ‐N decreased the pH of the rhizocylinder (root plus strongly adhering soil); fertilization with NO 3 ‐ increased rhizocylinder pH. The difference between the rhizocylinder pH of the NH 4 + and NO 3 ‐ treatments was as large as 1.9 pH units with an initial soil pH of 5.2 and as small as 0.2 units when soil pH prior to N application was 7.8. Ammonium‐fertilized soybeans absorbed more P and had a higher P concentration than NO 3 ‐fertilized soybeans. The results for soybeans grown with NH 4 + and NO 3 ‐ treatments at four initial soil pH levels showed that the P content of the shoots and roots was closely correlated with the pH of the rhizocylinder, but not the pH of the bulk soil. This suggests that the increased availability of P from the soil where NH 4 + was used was mainly due to the effect of the nitrogen source on the pH of the rhizosphere soil. Soybean root length decreased from 180 to 120 m/gram of dry roots as the pH of the rhizocylinder increased from 4.7 to 7.5.
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Claims 10
Claim · model-written summary
Liming the soil to increase pH decreased dissolved P.
- Taxon
- Soybeans
Glycine maxe1 - Treatment
- Liming the soile0
- Outcome
- P level in solutione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Liming the soil used in this research to increase pH decreased the P level in solution”
e1“Soybeans”
Claim · model-written summary
Ammonium fertilization decreased soybean rhizocylinder pH.
- Taxon
- soybeansGlycine maxe0
- Treatment
- NH 4 ‐Ne0
- Outcome
- pH of the rhizocylindere0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization of soybeans with NH 4 ‐N decreased the pH of the rhizocylinder”
Claim · model-written summary
Nitrate fertilization increased soybean rhizocylinder pH.
- Taxon
- soybeansGlycine maxe1
- Treatment
- NO 3 ‐e0
- Outcome
- rhizocylinder pHe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilization with NO 3 ‐ increased rhizocylinder pH”
e1“Fertilization of soybeans with NH 4 ‐N”
Claim · model-written summary
The pH difference between fertilizer forms reached 1.9 units at initial soil pH 5.2.
- Taxon
- soybeansGlycine maxe1
- Outcome
- difference between the rhizocylinder pHe0
- Value
- 1.9 pH unitse0
- Qualifier
- initial soil pH of 5.2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The difference between the rhizocylinder pH of the NH 4 + and NO 3 ‐ treatments was as large as 1.9 pH units with an initial soil pH of 5.2”
e1“Fertilization of soybeans with NH 4 ‐N”
Claim · model-written summary
The pH difference between fertilizer forms was as small as 0.2 units at soil pH 7.8.
- Taxon
- soybeansGlycine maxe1
- Outcome
- soil pHe0
- Value
- 0.2 unitse0
- Qualifier
- soil pH prior to N application was 7.8e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as small as 0.2 units when soil pH prior to N application was 7.8”
e1“Fertilization of soybeans with NH 4 ‐N”
Claim · model-written summary
Ammonium-fertilized soybeans absorbed more P than nitrate-fertilized soybeans.
- Taxon
- soybeansGlycine maxe0
- Treatment
- Ammonium‐fertilizede0
- Outcome
- absorbed more Pe0
- Direction
- moree0
- Comparator
- NO 3 ‐fertilized soybeanse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ammonium‐fertilized soybeans absorbed more P and had a higher P concentration than NO 3 ‐fertilized soybeans”
Claim · model-written summary
Ammonium-fertilized soybeans had higher P concentration than nitrate-fertilized soybeans.
- Taxon
- soybeansGlycine maxe0
- Treatment
- Ammonium‐fertilizede0
- Outcome
- P concentratione0
- Direction
- highere0
- Comparator
- NO 3 ‐fertilized soybeanse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ammonium‐fertilized soybeans absorbed more P and had a higher P concentration than NO 3 ‐fertilized soybeans”
Claim · model-written summary
Shoot and root P content correlated closely with rhizocylinder pH but not bulk-soil pH.
- Taxon
- soybeansGlycine maxt0
- Organ / stage
- shoots and rootse0
- Outcome
- P content of the shoots and rootse0
- Qualifier
- but not the pH of the bulk soile0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybeans grown with NH 4 + and NO 3 ‐ treatments”
e0“the P content of the shoots and roots was closely correlated with the pH of the rhizocylinder, but not the pH of the bulk soil”
Claim · model-written summary
The authors attributed increased soil P availability under ammonium to nitrogen-source effects on rhizosphere pH.
- Taxon
- soybeansGlycine maxe1
- Treatment
- NH 4 +e0
- Outcome
- increased availability of Pe0
- Qualifier
- effect of the nitrogen source on the pH of the rhizosphere soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increased availability of P from the soil where NH 4 + was used was mainly due to the effect of the nitrogen source on the pH of the rhizosphere soil”
e1“Fertilization of soybeans with NH 4 ‐N”
Claim · model-written summary
Soybean root length declined from 180 to 120 m/gram dry roots as rhizocylinder pH increased from 4.7 to 7.5.
- Taxon
- SoybeanGlycine maxe0
- Organ / stage
- roote0
- Outcome
- root lengthe0
- Direction
- decreasede0
- Value
- 180 to 120 m/gram of dry rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean root length decreased from 180 to 120 m/gram of dry roots as the pH of the rhizocylinder increased from 4.7 to 7.5”
The same questions in other papers
nitrogen · nutrient: content · Glycine max (soybean)Results differ
72 papers in the same direction as this paper · 20 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- negative
90 papers more in this group
See all 94 papers →lime · nutrient: content · Glycine max (soybean)Positive and negative results
8 papers in the same direction as this paper · 45 in the opposite direction
- positive
- positive
- positive
50 papers more in this group
See all 54 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.