Verification record
Every claim in this article was checked against the abstracts of the papers it cites, by a separate pass that was given those abstracts and nothing else. A claim marked supported carries the sentence that supports it, quoted verbatim below.
- References
- 14
- Claims checked
- 6
- Fully supported
- 5
- Checked on
- Sep 22, 2026
Claim by claim
Replacing 25 percent of the recommended NPK dose with 3,333 litres per hectare of fermented oil palm empty fruit bunch liquid fertilizer did not statistically reduce hybrid maize grain yield or nitrogen uptake on an acidic Ultisol.
SupportedField trialField trial
“Replacing up to 25% of NPK with fermented EFB liquid fertilizer maintained yield and N uptake on this Ultisol”
The abstract confirms that substituting 25% of the recommended NPK dose with 3,333 L/ha of fermented EFB liquid organic fertilizer maintained hybrid maize grain yield and nitrogen uptake on an acidic Ultisol without significant reductions.
Checked by google/gemini-3.8-flash on Sep 22, 2026
Replacing 50 percent of the NPK dose maintained grain yield but reduced nitrogen uptake by 13 percent relative to full NPK.
SupportedField trialField trial
“Replacing 25% and 50% of the NPK dose gave 8.15 and 7.34 t ha−1, and neither differed from full NPK (Tukey HSD, p < 0.05), whereas replacing 75% reduced yield to 6.01 t ha−1. Nitrogen uptake matched full NPK at 25% replacement and was 13% lower at 50% replacement.”
The abstract confirms that grain yield with 50% replacement did not differ significantly from full NPK and that nitrogen uptake was 13% lower.
Checked by google/gemini-3.8-flash on Sep 22, 2026
Replacing 75 percent of the NPK dose reduced grain yield to 6.01 tonnes per hectare, against 7.92 tonnes per hectare under full NPK.
SupportedField trialField trial
“Full NPK produced 7.92 t ha−1 of grain. Replacing 25% and 50% of the NPK dose gave 8.15 and 7.34 t ha−1, and neither differed from full NPK (Tukey HSD, p < 0.05), whereas replacing 75% reduced yield to 6.01 t ha−1.”
The abstract directly confirms that full NPK produced 7.92 t ha−1 of grain and replacing 75% of the dose reduced yield to 6.01 t ha−1.
Checked by google/gemini-3.8-flash on Sep 22, 2026
Agronomic efficiency of nitrogen rose from 30.6 to 37.9 kilograms of grain per kilogram of N when 25 percent of the NPK dose was replaced.
SupportedField trialField trial
“Agronomic efficiency of N rose from 30.6 to 37.9 kg grain per kg N at 25% replacement.”
The abstract directly confirms that agronomic efficiency of N increased from 30.6 to 37.9 kg grain per kg N at 25% NPK replacement.
Checked by google/gemini-3.8-flash on Sep 22, 2026
Soil pH after harvest was higher than under full NPK once 50 percent or more of the NPK dose was replaced.
SupportedField trialField trial
“Soil pH after harvest was higher than under full NPK once 50% or more of the NPK dose was replaced.”
The claim accurately reflects the abstract's direct statement regarding soil pH after harvest.
Checked by google/gemini-3.8-flash on Sep 22, 2026
The trial used four replications at one site for one season and included no cost analysis.
Partially supportedField trialField trial
“The result comes from one season at one site and lacks a cost analysis.”
The abstract confirms that the study involved one season at one site without a cost analysis and separately mentions four replications, but no single continuous span carries all elements of the claim.
Checked by google/gemini-3.8-flash on Sep 22, 2026
What this does and does not prove
It proves that every DOI cited resolves to a real registered work whose returned DOI matches the one requested, that none of them is retracted, and that each claim has a named sentence in a cited abstract behind it.
It does not prove that the paper as a whole supports the claim. An abstract can overstate its own findings, and a sentence can be read out of context. That is why the quote is printed here rather than summarised: if the check is wrong, you can see that it is wrong.
Evidence grading is automatic and conservative. Anything it cannot classify is marked unclassified rather than flattered upward.