Abstract
Soybean (Glycine max L. Merrill) crop started to be planted in the Brazilian Cerrado in the 1970's, and this region currently contributes with 57% of total soybean production in Brazil. Under natural conditions in this region, the soils present chemical limitations such as low pH, low Cation Exchange Capacity, low nutrient availability, and moreover, clayey soils have a high P fixation capacity mainly due to high contents of Fe/Al oxides. Since P is the most limiting nutrient is this region, a study was performed in the state of Maranhão, Brazil, in a Typic Hapludox, with clayey texture and low available P (extracted by resin). Treatments were defined to evaluate soybean response to broadcast Arad phosphate rock (PR) plus banded triple superphosphate (TSP) and to evaluate the soybean response to three proportions of PR and TSP. The experiment was established in October 2004 and was carried out for three consecutive crop years (2004/05 to 2006/07). The associated use of PR and TSP, in several situations, resulted in yields at least similar to that obtained with the use of the water soluble P source and, in some cases, even using lower P rates. Regarding the "mixtures", a linear response was observed when they were banded; however, when they were broadcasted, no increase in yield was observed above 50% of relative solubility. In conclusion, the association of sources differing in solubility may be a feasible agronomic option for P fertilizer management of soybeans.
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Claims 4
Claim · model-written summary
Combined phosphate rock and triple superphosphate gave soybean yields at least similar to soluble phosphorus, sometimes at lower rates.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- associated use of PR and TSPe0
- Outcome
- yieldse0
- Direction
- at least similare0
- Qualifier
- in some cases, even using lower P ratese0
- Comparator
- water soluble P sourcee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The associated use of PR and TSP, in several situations, resulted in yields at least similar to that obtained with the use of the water soluble P source and, in some cases, even using lower P rates.”
t0“Soybean”
Claim · model-written summary
Banded mixtures showed a linear soybean yield response.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- mixturese0
- Outcome
- linear responsee0
- Setting
- bandede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regarding the "mixtures", a linear response was observed when they were banded”
t0“Soybean”
Claim · model-written summary
Broadcast mixtures did not increase soybean yield above 50% relative solubility.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- broadcastede0
- Outcome
- yielde0
- Direction
- no increasee0
- Comparator
- 50% of relative solubilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when they were broadcasted, no increase in yield was observed above 50% of relative solubility”
t0“Soybean”
Claim · model-written summary
The authors conclude that combining phosphorus sources of different solubility may be feasible for soybean fertilizer management.
- Taxon
- soybeansGlycine maxe0
- Outcome
- association of sources differing in solubility may be a feasible agronomic option for P fertilizer managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the association of sources differing in solubility may be a feasible agronomic option for P fertilizer management of soybeans”
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