Abstract
During glasshouse experiments, lucerne plants were grown in deep (85 cm) reconstituted profiles of a granitic soil. The plants were subjected to controlled degrees of drought in surface layers, while a water table was maintained at 85 cm depth. The effect of placing monocalcium phosphate, sodium borate, and calcium carbonate (lime) in the moist subsoil (55 cm depth) was compared with that of application to surface layers, either frequently moistened or dry. Within 8 weeks of commencing surface drought the phosphorus concentration in the shoots had fallen to much lower levels than that in plants grown in surface-moist soil. Deep placement of monocalcium phosphate increased the phosphorus content and yield of the droughted plants, but the effects were greatly enhanced when the deep phosphate band was placed within a soil layer amended with lime and borate. These nutritional effects did not occur with surface-moist plants. The evidence indicated that the combined placement of phosphate, lime, and borate in the subsoil was particularly effective because of a marked increase in lateral root proliferation within the amended layer. Lime did not appear to influence phosphate availability directly through soil chemical effects. The results emphasize the importance of subsoil nutritional characteristics in stabilizing lucerne yields over intermittently wet and dry periods.
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Claims 7
Claim · model-written summary
Under surface drought, lucerne shoot phosphorus concentration fell to much lower levels than in surface-moist soil within 8 weeks.
- Taxon
- lucerne
Medicago sativat0 - Organ / stage
- shootse1
- Treatment
- surface droughte1
- Outcome
- phosphorus concentration in the shootse1
- Direction
- fallene1
- Comparator
- plants grown in surface-moist soile1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lucerne ( Medicago sativa L.)”
e1“Within 8 weeks of commencing surface drought the phosphorus concentration in the shoots had fallen to much lower levels than that in plants grown in surface-moist soil”
Claim · model-written summary
Deep placement of monocalcium phosphate increased phosphorus content and yield of droughted lucerne compared with surface application.
- Taxon
- lucerneMedicago sativat0
- Treatment
- Deep placement of monocalcium phosphatee2
- Outcome
- phosphorus content and yielde2
- Direction
- increasede2
- Qualifier
- droughted plantse2
- Comparator
- application to surface layerse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lucerne ( Medicago sativa L.)”
e2“Deep placement of monocalcium phosphate increased the phosphorus content and yield of the droughted plants”
e3“was compared with that of application to surface layers”
Claim · model-written summary
Placing the deep phosphate band within a soil layer amended with lime and borate greatly enhanced the effects on lucerne.
- Taxon
- lucerneMedicago sativat0
- Treatment
- placed within a soil layer amended with lime and boratee4
- Outcome
- effectse4
- Direction
- greatly enhancede4
- Qualifier
- deep phosphate bande4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lucerne ( Medicago sativa L.)”
e4“the effects were greatly enhanced when the deep phosphate band was placed within a soil layer amended with lime and borate”
Claim · model-written summary
The nutritional effects of deep phosphate placement did not occur in surface-moist lucerne plants.
- Taxon
- lucerneMedicago sativat0
- Treatment
- Deep placement of monocalcium phosphatee2
- Outcome
- nutritional effectse5
- Direction
- did not occure5
- Comparator
- surface-moist plantse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lucerne ( Medicago sativa L.)”
e2“Deep placement of monocalcium phosphate increased the phosphorus content and yield of the droughted plants”
e5“These nutritional effects did not occur with surface-moist plants”
Claim · model-written summary
Combined placement of phosphate, lime and borate in the subsoil was particularly effective for lucerne, probably because of increased lateral root proliferation.
- Taxon
- lucerneMedicago sativat0
- Treatment
- combined placement of phosphate, lime, and borate in the subsoile6
- Outcome
- effectivee6
- Qualifier
- a marked increase in lateral root proliferation within the amended layere6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lucerne ( Medicago sativa L.)”
e6“the combined placement of phosphate, lime, and borate in the subsoil was particularly effective because of a marked increase in lateral root proliferation within the amended layer”
Claim · model-written summary
Lime did not appear to influence lucerne phosphate availability directly through soil chemical effects.
- Taxon
- lucerneMedicago sativat0
- Treatment
- Limee7
- Outcome
- phosphate availabilitye7
- Direction
- did not appear to influencee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lucerne ( Medicago sativa L.)”
e7“Lime did not appear to influence phosphate availability directly through soil chemical effects”
Claim · model-written summary
Subsoil nutritional characteristics are important for stabilizing lucerne yields over intermittently wet and dry periods.
- Taxon
- lucerneMedicago sativae0
- Outcome
- importance of subsoil nutritional characteristicse0
- Qualifier
- stabilizing lucerne yields over intermittently wet and dry periodse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results emphasize the importance of subsoil nutritional characteristics in stabilizing lucerne yields over intermittently wet and dry periods”
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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.