Abstract
Abstract Results are presented of two groups of experiments involving radish and ryegrass crops in different soil types in the greenhouse. Several extractants were used to assess the ‘plant available’ phosphate contents of soils. Results by the Olsen bicarbonate and Egnér type extractants correlated well with phosphate uptake by the crops, although Egnér values had previously been found not to correlate well with yields of dry matter when results for basaltic soils were included. Phosphate contents of water extracts classified the soils in much the same order as Olsen soil‐P values. Total phosphate uptake was highly correlated with the percentage phosphate saturation of the soils. Phosphate uptake was also highly correlated with the ‘isotopic dilution factor’. The effect of fertiliser phosphate on the uptake of fertiliser P at two levels was studied in three soils using 32 P also at two levels. Radioactive phosphate had no effect on total phosphate content of ryegrass but at the highest level (100μC of 32 P/pot) it significantly reduced the uptake of fertiliser phosphate. The L value of the soils was increased significantly both by increasing phosphate fertiliser and by increasing the level of 32 P incorporated in the fertiliser, although the utilisation of soil phosphate was increased in only one soil—the basalt soil—by the application of phosphate fertiliser. L values of the same order were obtained for two soils which differed noticeably in their capacity to supply phosphate for ryegrass growth.
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Claims 11
Claim · model-written summary
Olsen bicarbonate extractant results correlated well with crop phosphate uptake.
- Taxon
- radish and ryegrass crops
Raphanus sativus
Loliume1 - Treatment
- Olsen bicarbonatee0
- Outcome
- phosphate uptake by the cropse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results by the Olsen bicarbonate and Egnér type extractants correlated well with phosphate uptake by the crops”
e1“radish and ryegrass crops”
Claim · model-written summary
Egnér extractant results correlated well with crop phosphate uptake.
- Taxon
- radish and ryegrass cropsRaphanus sativusLoliume1
- Treatment
- Egnér type extractantse0
- Outcome
- phosphate uptake by the cropse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results by the Olsen bicarbonate and Egnér type extractants correlated well with phosphate uptake by the crops”
e1“radish and ryegrass crops”
Claim · model-written summary
Water extract phosphate ranked soils similarly to Olsen soil P.
- Taxon
- radish and ryegrass cropsRaphanus sativusLoliume1
- Outcome
- classified the soils in much the same ordere0
- Comparator
- Olsen soil‐P valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphate contents of water extracts classified the soils in much the same order as Olsen soil‐P values”
e1“radish and ryegrass crops”
Claim · model-written summary
Total crop phosphate uptake was highly correlated with soil phosphate saturation.
- Taxon
- radish and ryegrass cropsRaphanus sativusLoliume1
- Outcome
- Total phosphate uptakee0
- Setting
- soilse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total phosphate uptake was highly correlated with the percentage phosphate saturation of the soils”
e1“radish and ryegrass crops”
Claim · model-written summary
Crop phosphate uptake was highly correlated with isotopic dilution factor.
- Taxon
- radish and ryegrass cropsRaphanus sativusLoliume1
- Treatment
- isotopic dilution factore0
- Outcome
- Phosphate uptakee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphate uptake was also highly correlated with the ‘isotopic dilution factor’”
e1“radish and ryegrass crops”
Claim · model-written summary
Radioactive phosphate had no effect on total phosphate content in ryegrass.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Radioactive phosphate had no effect on total phosphate content of ryegrass”
Claim · model-written summary
At the highest radioactive phosphate level, fertilizer phosphate uptake fell significantly.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at the highest level (100μC of 32 P/pot) it significantly reduced the uptake of fertiliser phosphate”
e1“phosphate content of ryegrass”
Claim · model-written summary
Increasing phosphate fertilizer significantly increased soil L value.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The L value of the soils was increased significantly both by increasing phosphate fertiliser and by increasing the level of 32 P incorporated in the fertiliser”
e1“phosphate content of ryegrass”
Claim · model-written summary
Increasing incorporated radioactive phosphorus significantly increased soil L value.
- Treatment
- increasing the level of 32 P incorporated in the fertilisere0
- Outcome
- L value of the soilse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The L value of the soils was increased significantly both by increasing phosphate fertiliser and by increasing the level of 32 P incorporated in the fertiliser”
e1“phosphate content of ryegrass”
Claim · model-written summary
Phosphate fertilizer increased soil phosphate utilization only in basalt soil.
- Treatment
- application of phosphate fertilisere0
- Outcome
- utilisation of soil phosphatee0
- Direction
- increasede0
- Setting
- basalt soile0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the utilisation of soil phosphate was increased in only one soil—the basalt soil—by the application of phosphate fertiliser”
e1“phosphate content of ryegrass”
Claim · model-written summary
Two soils with differing supply capacities gave similar L values.
- Outcome
- L values of the same ordere0
- Qualifier
- two soils which differed noticeably in their capacity to supply phosphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“L values of the same order were obtained for two soils which differed noticeably in their capacity to supply phosphate for ryegrass growth”
The same questions in other papers
phosphorus · molecular: metabolites · LoliumPositive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
fertilization · molecular: metabolites · LoliumPositive and negative results
7 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- no effect
- negative
9 papers more in this group
See all 13 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.