Abstract
Improved P and K management systems for no‐tillage soybean [ Glycine max (L.) Merr.] may be needed to increase yield and profits. This study evaluated the response of soybean to fertilizer P or K rates and placement as well as residual and direct fertilization from 1995 through 1996. Two K and two P experiments were established on farmers’ fields with 10‐yr histories of no tillage. An additional P experiment was conducted on one of Iowa State University's research farms. Treatments on farmers’ fields included two rates of P (0 and 19.5 kg P ha −1 ) or K (0 and 51 kg K ha −1 ), placement of fertilizer (surface broadcast or a subsurface band 5 cm beside and 5 cm below the seed) and time of fertilizer application. Treatments on the research farm were similar, except the P fertilizer rates applied were 0, 19, 39, and 78 kg ha −1 . Leaf P and K concentrations and grain yields were measured. Soil test P and K levels at the 0‐ to 15‐cm depths ranged from low to very high across sites at the beginning of the experiment. Placement effects were variable for leaf P or K concentrations. Grain yields for broadcast P and K were as good as or better than the banded applications. However, there may be an advantage to applying P directly to the soybean crop, at least when soil test levels are optimum or lower.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
Fertilizer placement had variable effects on soybean leaf P or K concentrations.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Placemente0
- Outcome
- leaf P or K concentrationse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Placement effects were variable for leaf P or K concentrations.”
t0“Soybean”
Claim · model-written summary
Broadcast phosphorus produced soybean grain yields as good as or better than banded phosphorus.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- broadcast Pe0
- Outcome
- Grain yieldse0
- Direction
- as good as or better thane0
- Comparator
- banded applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields for broadcast P and K were as good as or better than the banded applications.”
t0“Soybean”
Claim · model-written summary
Broadcast potassium produced soybean grain yields as good as or better than banded potassium.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- broadcast P and Ke0
- Outcome
- Grain yieldse0
- Direction
- as good as or better thane0
- Comparator
- banded applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields for broadcast P and K were as good as or better than the banded applications.”
t0“Soybean”
Claim · model-written summary
The authors suggest an advantage to applying P directly to soybean when soil tests are optimum or lower.
- Taxon
- soybeanGlycine maxe0
- Outcome
- applying P directly to the soybean crope0
- Qualifier
- at least when soil test levels are optimum or lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there may be an advantage to applying P directly to the soybean crop, at least when soil test levels are optimum or lower.”
The same questions in other papers
potassium · yield · Glycine max (soybean)Results differ
122 papers in the same direction as this paper · 25 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- positive
- positive
145 papers more in this group
See all 149 papers →transplanting · yield · Glycine max (soybean)Positive and negative results
31 papers in the same direction as this paper · 12 in the opposite direction
- no effect
- negative
- positive
40 papers more in this group
See all 44 papers →phosphorus · yield · Glycine max (soybean)Positive and negative results
302 papers in the same direction as this paper · 42 in the opposite direction · 10 reporting no difference from an alternative
- no effect
- no effect
- positive
351 papers more in this group
See all 355 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.