Abstract
ABSTRACT It was evaluated the residual effects of sedimentary phosphates associated with the annual application of phosphate on maize grown in Inceptisol soil with a high exchangeable calcium concentration and pH value of 6.0. The experiment was conducted based on a completely randomized block design with strip-split plots. The main plots were treated with Bayóvar rock phosphate, Itafós rock phosphate, or triple superphosphate, while the control received no additional phosphate. The phosphate sources were applied by broadcasting and incorporated in the soil two years prior to the current study at 200 kg of P2O5 ha-1, with no tillage in subsequent years. In the sub-plots, phosphate doses of 0, 60, and 120 kg of P2O5 ha-1 year-1, as triple superphosphate, were applied at the base of the sowing furrows. Leaf phosphorus (P), grain yield, and soil P by ion exchange resin were evaluated. Differences were observed between the leaf P among the plots treated with phosphate sources and the control plot, which declined from 2013 to 2015. In 2013 and 2014, rock phosphate residuals influenced the grain yield when there was no annual application of phosphate. In 2015, grain yields in rock phosphate treatments without annual phosphate application were not superior to those in the control treatment and did not differ significantly from the plots receiving triple superphosphate. Furthermore, it was found that the soil P content extracted by ion exchange resin was higher in the Itafós treatment; however, for this source, the correlation between soil P and grain yield was relatively weak.
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Claims 6
Claim · model-written summary
Leaf phosphorus differed between phosphate source treatments and control, with the difference declining from 2013 to 2015.
- Treatment
- phosphate sourcese0
- Outcome
- leaf Pe0
- Direction
- declinede0
- Qualifier
- 2013 to 2015e0
- Comparator
- control plote0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences were observed between the leaf P among the plots treated with phosphate sources and the control plot, which declined from 2013 to 2015.”
t0“Maize yield”
Claim · model-written summary
Rock phosphate residuals influenced grain yield in 2013 and 2014 without annual phosphate.
- Treatment
- rock phosphate residualse0
- Outcome
- grain yielde0
- Qualifier
- In 2013 and 2014e0
- Comparator
- no annual application of phosphatee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2013 and 2014, rock phosphate residuals influenced the grain yield when there was no annual application of phosphate.”
t0“Maize yield”
Claim · model-written summary
In 2015, grain yield with rock phosphate residues and no annual phosphate was not superior to control.
- Treatment
- rock phosphate treatments without annual phosphate applicatione0
- Outcome
- grain yieldse0
- Direction
- not superiore0
- Qualifier
- In 2015e0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2015, grain yields in rock phosphate treatments without annual phosphate application were not superior to those in the control treatment”
t0“Maize yield”
Claim · model-written summary
In 2015, yields of rock phosphate treatments without annual phosphate did not differ significantly from triple superphosphate plots.
- Treatment
- rock phosphate treatments without annual phosphate applicatione0
- Outcome
- grain yieldse0
- Direction
- did not differe0
- Qualifier
- In 2015e0
- Comparator
- plots receiving triple superphosphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2015, grain yields in rock phosphate treatments without annual phosphate application were not superior to those in the control treatment and did not differ significantly from the plots receiving triple superphosphate.”
t0“Maize yield”
Claim · model-written summary
Resin-extracted soil phosphorus was higher with Itafós.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the soil P content extracted by ion exchange resin was higher in the Itafós treatment”
t0“Maize yield”
Claim · model-written summary
For Itafós, the correlation between soil phosphorus and grain yield was relatively weak.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for this source, the correlation between soil P and grain yield was relatively weak.”
e1“higher in the Itafós treatment”
t0“Maize yield”
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This paper is about lacking the nutrient, so it counts the other way round here.
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