Abstract
Phosphorus is one of the most limiting nutrients for plants in weathered tropical soils. To overcome this constraint, the use of humic‐complexed phosphate fertilizer may be considered as one alternative, which would reduce P fixation and increase its bioavailability. This study aimed to determine the crop yield response and soil P lability changes after five crop cycles under humic‐complexed and non‐humic‐complexed superphosphate cumulative applications. The field experiment was conducted for 4 yr (2010–2013) in Tibagi, Brazil, in a Typic Hapludox, arranged in a randomized block design with two P sources; single superphosphate (SSP) and complexed single superphosphate (CSSP); and five cumulative dosages (0, 48, 96, 144, and 192 kg P ha −1 ), divided over five consecutive crops: maize ( Zea mays L.), wheat ( Triticum aestivum L.), soybean [ Glycine max (L.) Merr.], white oat ( Avena sativa L.), and soybean. Grain yield was determined for each crop and soil samples were collected after the fifth harvest for Hedley P fractionation. Our results demonstrated that cumulative grain yield increased in line with the P dosage, however, higher agronomic efficiency was also observed at intermediate P dosages, when CSSP was used. Labile soil P was more influenced by the application of CSSP than SSP. Moreover, higher cumulative P dosages also increased labile and non‐labile P, mainly in the 0‐ to 5‐cm layer, indicating an intensive P pool reallocation in the surface soil layer. The study demonstrated that humic‐complexed phosphate fertilizer can enhance soil P availability and improve crop grain yield in commercial field conditions. Core Ideas Phosphate fertilizers efficiency in cropping system. Residual effects of phosphate sources in tropical weathered soils. Organic complexed fertilizers can be more efficient in plant P supply. Soil labile P is affected by clay content and its adsorption capacity.
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Claims 6
Claim · model-written summary
Cumulative grain yield increased with phosphorus dose across the five crops.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cumulative grain yield increased in line with the P dosage”
e1“maize ( Zea mays L.), wheat ( Triticum aestivum L.), soybean [ Glycine max (L.) Merr.], white oat ( Avena sativa L.), and soybean”
Claim · model-written summary
CSSP gave higher agronomic efficiency at intermediate phosphorus doses.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher agronomic efficiency was also observed at intermediate P dosages, when CSSP was used”
e1“maize ( Zea mays L.)”
Claim · model-written summary
CSSP affected labile soil phosphorus more than SSP.
Not reportedTaxon
Verbatim
e0“Labile soil P was more influenced by the application of CSSP than SSP.”
Claim · model-written summary
Higher cumulative phosphorus doses increased labile phosphorus mainly in surface soil.
- Treatment
- higher cumulative P dosagese0
- Outcome
- labile Pe0
- Direction
- increasede0
- Qualifier
- 0‐ to 5‐cm layere0
Not reportedTaxonComparator
Verbatim
e0“higher cumulative P dosages also increased labile and non‐labile P, mainly in the 0‐ to 5‐cm layer”
Claim · model-written summary
Higher cumulative phosphorus doses increased nonlabile phosphorus mainly in surface soil.
- Treatment
- higher cumulative P dosagese0
- Outcome
- non‐labile Pe0
- Direction
- increasede0
- Qualifier
- 0‐ to 5‐cm layere0
Not reportedTaxonComparator
Verbatim
e0“higher cumulative P dosages also increased labile and non‐labile P, mainly in the 0‐ to 5‐cm layer”
Claim · model-written summary
Humic complexed phosphate fertilizer was concluded to enhance soil phosphorus availability and crop grain yield in commercial fields.
- Treatment
- humic‐complexed phosphate fertilizere0
- Outcome
- crop grain yielde0
- Setting
- commercial field conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“humic‐complexed phosphate fertilizer can enhance soil P availability and improve crop grain yield in commercial field conditions”
e1“maize ( Zea mays L.)”
The same questions in other papers
phosphorus · nutrient: efficiency · Zea mays (maize)Positive and negative results
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- no effect
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See all 34 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.