Abstract
Abstract Two fluid acid‐type fertilizers made by mixing urea with H3PO4 or urea with H3PO4 and H2SO4, an ammonium polyphosphate (APP) fluid, and granular triple superphosphate (TSP) and diammonium phosphate (DAP) were banded alone or with FeSO4 in an Fe‐deficient Epping silt loam soil (Ustic Torriorthent) in two greenhouse pot experiments. Grain sorghum (Sorghum bicolor L. Moench) forage yields and Fe uptake increased with band application of FeSO4 alone or with these fertilizers except with DAP. Forage yields and Fe uptake with band application of fertilizers alone (no FeSO4) were somewhat higher with all three fluid fertilizers and TSP, indicating that Fe availability in this soil may have been increased by band application of these fertilizers or that Fe contaminants in these fertilizers may have been available to plants. Each fertilizer also was banded to soil in plexiglass cells in the laboratory. Soil in radial increments around the fertilizer bands was sampled after 7, 21, and 35 days. Within 1 cm of the band, soil pH decreased more with the acid‐type fertilizers than with APP. DTPA‐extractable Fe near the fertilizer band was higher with APP than with the acid‐type products and decreased with distance from the band. Research is needed on other soils to determine if banded acid‐type fertilizers affect levels of available soil Fe sufficiently to correct Fe chlorosis of crops on Fe‐deficient soils and if these fertilizers are effective carriers of FeSO4.
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Claims 4
Claim · model-written summary
Banded FeSO4, alone or with fertilizers other than DAP, increased sorghum forage yield and iron uptake.
- Taxon
- Grain sorghum
Sorghum bicolore0 - Treatment
- band application of FeSO4e0
- Outcome
- forage yields and Fe uptakee0
- Direction
- increasede0
- Qualifier
- except with DAPe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain sorghum (Sorghum bicolor L. Moench) forage yields and Fe uptake increased with band application of FeSO4 alone or with these fertilizers except with DAP.”
Claim · model-written summary
Without FeSO4, fluid fertilizers and TSP gave somewhat higher sorghum forage yields and iron uptake.
- Taxon
- Grain sorghumSorghum bicolort0
- Treatment
- all three fluid fertilizers and TSPe0
- Outcome
- Forage yields and Fe uptakee0
- Direction
- highere0
- Qualifier
- no FeSO4e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Grain sorghum”
e0“Forage yields and Fe uptake with band application of fertilizers alone (no FeSO4) were somewhat higher with all three fluid fertilizers and TSP”
Claim · model-written summary
Acid-type fertilizer bands decreased nearby soil pH more than APP.
- Taxon
- Grain sorghumSorghum bicolort0
- Treatment
- acid‐type fertilizerse0
- Outcome
- soil pHe0
- Direction
- decreasede0
- Comparator
- APPe0
- Setting
- Within 1 cm of the bande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Within 1 cm of the band, soil pH decreased more with the acid‐type fertilizers than with APP.”
t0“Grain sorghum”
Claim · model-written summary
Extractable soil iron near fertilizer bands was higher with APP than acid-type products and declined with band distance.
- Taxon
- Grain sorghumSorghum bicolort0
- Treatment
- APPe0
- Outcome
- DTPA‐extractable Fee0
- Direction
- highere0
- Comparator
- acid‐type productse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Grain sorghum”
e0“DTPA‐extractable Fe near the fertilizer band was higher with APP than with the acid‐type products and decreased with distance from the band.”
The same questions in other papers
iron(2+) sulfate (anhydrous) · yield · Sorghum bicolor (sorghum)Results agree
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- no effect
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- no effect
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See all 92 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.