Abstract
Abstract The reactions between soil and fertilizer P at six levels of liming were investigated on an acid tropical soil. An acidic soil of pH 3.8 was limed to pH 7.0 in stages. Four levels of phosphorus were added to the soils. For any level of phosphorus, liming decreased soluble P and labile P until the pH reached about 6.5. The phosphate potentials did not lie consistently on known solubility isotherms, but the potentials approached hydroxyapatite at pH values between 6.9 and 7.0. A labile pool of P appeared to govern mainly the concentration of P in the soil solution. Limed soil had a higher maximum adsorption capacity for phosphorus than the unlimed soil. Adsorption of P by the freshly precipitated Fe and Al hydroxides apparently caused the greater inactivation of added phosphorus in the limed soils. Rye ( Secale cereale L.) and millet ( Setaria italica L.) were grown in the greenhouse at six levels of lime and four levels of phosphorus. The yields and percent P of rye were significantly increased by P without lime, but the response to added P was greater in the presence of lime. Lime with added P caused larger differences in yield and percent P of millet than in rye. Liming increased the yields of millet with added P until a pH of about 5 to 6 was reached, but further additions of lime decreased the yields. The percent P of millet increased with the initial applications of lime, but further additions resulted in a slight decrease of percent P. Plants were healthier and their root system better developed on the limed soil, which probably caused a higher percent P in the tops.
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Claims 10
Claim · model-written summary
Phosphorus increased rye yield without lime, with greater response when lime was present.
Secale cerealeOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yields and percent P of rye were significantly increased by P without lime, but the response to added P was greater in the presence of lime.”
Claim · model-written summary
Phosphorus increased rye percent P without lime, with greater response under liming.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yields and percent P of rye were significantly increased by P without lime, but the response to added P was greater in the presence of lime.”
Claim · model-written summary
Lime plus phosphorus produced larger millet yield differences than rye.
Verbatim
e0“Lime with added P caused larger differences in yield and percent P of millet than in rye.”
Claim · model-written summary
Lime plus phosphorus produced larger millet percent P differences than rye.
Verbatim
e0“Lime with added P caused larger differences in yield and percent P of millet than in rye.”
Claim · model-written summary
With added phosphorus, liming increased millet yield until pH about 5 to 6, then further lime decreased it.
- Taxon
- millete0
- Treatment
- Liminge0
- Outcome
- yields of millete0
- Direction
- increasede0
- Qualifier
- pH of about 5 to 6e0
Not reportedComparator
Verbatim
e0“Liming increased the yields of millet with added P until a pH of about 5 to 6 was reached, but further additions of lime decreased the yields.”
Claim · model-written summary
Further lime beyond pH about 5 to 6 decreased millet yield.
Not reportedComparator
Verbatim
e0“but further additions of lime decreased the yields.”
t0“Plant Growth”
e1“Lime with added P caused larger differences in yield and percent P of millet than in rye.”
Claim · model-written summary
Initial lime applications increased millet percent P.
Not reportedComparator
Verbatim
e0“The percent P of millet increased with the initial applications of lime”
Claim · model-written summary
Further lime slightly decreased millet percent P.
Not reportedComparator
Verbatim
e0“but further additions resulted in a slight decrease of percent P.”
t0“Plant Growth”
e1“Lime with added P caused larger differences in yield and percent P of millet than in rye.”
Claim · model-written summary
Plants on limed soil were healthier and had better developed roots.
- Taxon
- PlantsViridiplantaee0
- Treatment
- limed soile0
- Outcome
- healthier and their root system better developede0
- Direction
- better developede0
Not reportedComparator
Verbatim
e0“Plants were healthier and their root system better developed on the limed soil”
Claim · model-written summary
The authors attributed higher shoot percent P to healthier, better developed roots on limed soil.
- Taxon
- PlantsViridiplantaee1
- Outcome
- higher percent P in the topse0
- Qualifier
- probablye0
Verbatim
e0“which probably caused a higher percent P in the tops.”
t0“Plant Growth”
e1“Plants were healthier and their root system better developed on the limed soil”
The same questions in other papers
lime · growth · Viridiplantae (plants)Results agree
1 paper in the same direction as this paper
- positive
phosphorus · yield · Secale cereale (rye)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.