Abstract
Predicted physiological factors and a limited number of field studies have resulted in debate regarding the recommendation of in‐season fertilizer N for soybean [ Glycine max . (L.) Merrill]. The objective of our research was to evaluate several in‐season N fertilization strategies on soybean seed yield response as well as to measure the effect of fertilizer N additions on late‐season plant N concentrations and accumulation, seed N removal, seed protein, and seed oil composition. The research was conducted at 12 sites in the southern soybean‐growing region of Minnesota in 1998 and 1999. A combination of (i) application time (July vs. August), (ii) placement method (broadcast vs. knifed), and (iii) N source (urea vs. poly‐coated urea) gave five N treatments plus a control at all sites. Seed yield did not respond to the fertilizer N treatments at any of the 12 sites; however, a combined analysis indicated a significant increase (generally less than 0.06 Mg ha −1 ) from using polymer‐coated urea or applying the urea in August. Herbage dry matter (DM) and herbage N concentrations at the R6 stage were not affected by any of the N fertilizer strategies. Although soybean seed protein was statistically different among the treatments, protein was only increased 0.4 g kg −1 . Soybean oil concentration was not affected by fertilizer treatments. In general, polymer‐coated urea, knifed applications, and August applications increased soil NO 3 –N in the 0‐ to 30‐cm layer at R6 relative to standard urea, broadcast applications, and July applications. Even though in‐season N fertilizer created greater levels of available soil N at all 12 sites during soybean pod filling, seed yield was not improved compared with unfertilized control plots at any site. As a result, the University of Minnesota does not recommended in‐season N fertilizer applications for soybean production.
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Claims 11
Claim · model-written summary
Fertilizer N treatments did not change soybean seed yield at any of the 12 sites
- Taxon
- Soybean
Glycine maxt0 - Treatment
- fertilizer N treatmentse0
- Outcome
- Seed yielde0
- Direction
- did not responde0
- Comparator
- unfertilized control plotse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean in Minnesota”
e0“Seed yield did not respond to the fertilizer N treatments at any of the 12 sites”
e7“seed yield was not improved compared with unfertilized control plots at any site”
Claim · model-written summary
Polymer-coated urea increased soybean seed yield by less than 0.06 Mg ha-1 in the combined analysis
- Taxon
- SoybeanGlycine maxt0
- Treatment
- polymer‐coated ureae1
- Outcome
- Seed yielde0
- Direction
- increasee1
- Value
- less than 0.06 Mg ha −1e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean in Minnesota”
e0“Seed yield did not respond to the fertilizer N treatments at any of the 12 sites”
e1“a combined analysis indicated a significant increase (generally less than 0.06 Mg ha −1 ) from using polymer‐coated urea or applying the urea in August”
Claim · model-written summary
Applying urea in August increased soybean seed yield by less than 0.06 Mg ha-1 in the combined analysis
- Taxon
- SoybeanGlycine maxt0
- Treatment
- applying the urea in Auguste1
- Outcome
- Seed yielde0
- Direction
- increasee1
- Value
- less than 0.06 Mg ha −1e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean in Minnesota”
e0“Seed yield did not respond to the fertilizer N treatments at any of the 12 sites”
e1“a combined analysis indicated a significant increase (generally less than 0.06 Mg ha −1 ) from using polymer‐coated urea or applying the urea in August”
Claim · model-written summary
Herbage dry matter and herbage N concentrations at R6 were not affected by N fertilizer strategies
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- R6 stagee2
- Outcome
- Herbage dry matter (DM) and herbage N concentrationse2
- Direction
- were not affectede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean in Minnesota”
e2“Herbage dry matter (DM) and herbage N concentrations at the R6 stage were not affected by any of the N fertilizer strategies”
Claim · model-written summary
Soybean seed protein was statistically different among N treatments but increased only by 0.4 g kg-1
- Taxon
- SoybeanGlycine maxt0
- Treatment
- the treatmentse3
- Outcome
- soybean seed proteine3
- Direction
- increasede3
- Value
- 0.4 g kg −1e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean in Minnesota”
e3“Although soybean seed protein was statistically different among the treatments, protein was only increased 0.4 g kg −1”
Claim · model-written summary
Soybean oil concentration was not affected by fertilizer treatments
- Taxon
- SoybeanGlycine maxt0
- Outcome
- Soybean oil concentratione4
- Direction
- not affectede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean in Minnesota”
e4“Soybean oil concentration was not affected by fertilizer treatments”
Claim · model-written summary
Polymer-coated urea increased soil NO3-N at R6 relative to standard urea
- Taxon
- SoybeanGlycine maxt0
- Treatment
- polymer‐coated ureae5
- Outcome
- soil NO 3 –Ne5
- Direction
- increasede5
- Comparator
- standard ureae5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean in Minnesota”
e5“polymer‐coated urea, knifed applications, and August applications increased soil NO 3 –N in the 0‐ to 30‐cm layer at R6 relative to standard urea, broadcast applications, and July applications”
Claim · model-written summary
Knifed applications increased soil NO3-N at R6 relative to broadcast applications
- Taxon
- SoybeanGlycine maxt0
- Treatment
- knifed applicationse5
- Outcome
- soil NO 3 –Ne5
- Direction
- increasede5
- Comparator
- broadcast applicationse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean in Minnesota”
e5“polymer‐coated urea, knifed applications, and August applications increased soil NO 3 –N in the 0‐ to 30‐cm layer at R6 relative to standard urea, broadcast applications, and July applications”
Claim · model-written summary
August applications increased soil NO3-N at R6 relative to July applications
- Taxon
- SoybeanGlycine maxt0
- Treatment
- August applicationse5
- Outcome
- soil NO 3 –Ne5
- Direction
- increasede5
- Comparator
- July applicationse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean in Minnesota”
e5“polymer‐coated urea, knifed applications, and August applications increased soil NO 3 –N in the 0‐ to 30‐cm layer at R6 relative to standard urea, broadcast applications, and July applications”
Claim · model-written summary
In-season N fertilizer created greater available soil N at all 12 sites during soybean pod filling
- Taxon
- SoybeanGlycine maxt0
- Outcome
- available soil Ne6
- Direction
- greater levelse6
- Qualifier
- during soybean pod fillinge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean in Minnesota”
e6“created greater levels of available soil N at all 12 sites during soybean pod filling”
Claim · model-written summary
In-season N fertilizer applications for soybean production are not recommended
- Taxon
- SoybeanGlycine maxt0
- Outcome
- N fertilizer applications for soybean productione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Soybean in Minnesota”
e1“N fertilizer applications for soybean production”
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See all 1,192 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.