Abstract
Core Ideas Soybean leaf senescence and maturation, yield, and seed quality were minimally impacted by soil and foliar-applied nitrogen. Cultivar differences in maturation, yield, and seed quality were evident. The use of NDVI is an effective technique to describe soybean leaf senescence during maturation. Ohio producers often question whether fertilizing soybeans [Glycine max (L.) Merr.] with nitrogen (N) will increase yield. Foliar- and soil-applied N have been evaluated throughout the Midwestern US, but few studies have compared the response of commercially available foliar N applications to soil-applied N within the same environments. Additionally, there is limited information on the impacts of N application on soybean maturation and leaf senescence. The objectives of this study were to: (i) evaluate the effect of various rates of soil- and foliar-applied N at different growth stages on the maturation of soybeans; and (ii) quantify the effect on soybean yield and quality (protein and oil) of soil and foliar N application. A field study was conducted in 2017 at two Ohio locations using a randomized complete block design with full factorial of soybean cultivar (one Maturity Group II and one Maturity Group III) and N application treatment (unfertilized control and four N applications varying in source, rate, and timing). The maturity date, yield, and quality varied among cultivars. Leaf senescence was impacted by weather conditions to a greater extent than N application. Maturity date was impacted by N application, but all treatments matured within 1 day of one another and were similar to the untreated control. The N treatments had minimal effects on leaf senescence, yield, seed protein, and seed oil. Future studies should focus on expanding these results in additional environments and with more N application treatments.
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Claims 7
Claim · model-written summary
N treatments had minimal effects on soybean leaf senescence and yield compared with the unfertilized control.
- Taxon
- Glycine max
Glycine maxe0 - Treatment
- N treatmentse5
- Outcome
- leaf senescence, yielde5
- Direction
- minimal effectse5
- Comparator
- unfertilized controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizing soybeans [Glycine max (L.) Merr.]”
e1“unfertilized control and four N applications varying in source, rate, and timing”
e5“The N treatments had minimal effects on leaf senescence, yield, seed protein, and seed oil”
Claim · model-written summary
N treatments had minimal effects on soybean seed protein and seed oil compared with the unfertilized control.
- Taxon
- Glycine maxGlycine maxe0
- Treatment
- N treatmentse5
- Outcome
- seed protein, and seed oile5
- Direction
- minimal effectse5
- Comparator
- unfertilized controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizing soybeans [Glycine max (L.) Merr.]”
e1“unfertilized control and four N applications varying in source, rate, and timing”
e5“The N treatments had minimal effects on leaf senescence, yield, seed protein, and seed oil”
Claim · model-written summary
Leaf senescence in soybean was impacted by weather conditions to a greater extent than by N application.
- Taxon
- Glycine maxGlycine maxe0
- Treatment
- weather conditionse3
- Outcome
- Leaf senescencee3
- Direction
- impactede3
- Qualifier
- to a greater extente3
- Comparator
- N applicatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizing soybeans [Glycine max (L.) Merr.]”
e3“Leaf senescence was impacted by weather conditions to a greater extent than N application”
Claim · model-written summary
Maturity date, yield and quality varied among soybean cultivars.
- Taxon
- Glycine maxGlycine maxe0
- Material
- cultivarse2
- Outcome
- maturity date, yield, and qualitye2
- Direction
- variede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizing soybeans [Glycine max (L.) Merr.]”
e2“The maturity date, yield, and quality varied among cultivars”
Claim · model-written summary
Maturity date of soybean was impacted by N application.
- Taxon
- Glycine maxGlycine maxe0
- Treatment
- N applicatione4
- Outcome
- Maturity datee4
- Direction
- impactede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizing soybeans [Glycine max (L.) Merr.]”
e4“Maturity date was impacted by N application, but all treatments matured within 1 day of one another and were similar to the untreated control”
Claim · model-written summary
All soybean N treatments matured within 1 day of one another and were similar to the untreated control.
- Taxon
- Glycine maxGlycine maxe0
- Treatment
- all treatmentse4
- Outcome
- matured within 1 daye4
- Direction
- similare4
- Comparator
- untreated controle4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizing soybeans [Glycine max (L.) Merr.]”
e4“Maturity date was impacted by N application, but all treatments matured within 1 day of one another and were similar to the untreated control”
Claim · model-written summary
NDVI is an effective technique to describe soybean leaf senescence during maturation.
- Taxon
- soybeanGlycine maxe6
- Outcome
- leaf senescencee6
- Qualifier
- effective techniquee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The use of NDVI is an effective technique to describe soybean leaf senescence during maturation”
The same questions in other papers
nitrogen · quality: protein · Glycine max (soybean)Results differ
17 papers in the same direction as this paper · 47 in the opposite direction
- no effect
- positive
- positive
61 papers more in this group
See all 65 papers →nitrogen · quality: postharvest · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
1 paper more in this group
See all 5 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.