Abstract
Abstract The objective of this research was to determine the effect on soybean ( Glycine max (L.) Merrill) yields of N added at different rates by different times and methods of application, as direct and residual, and as inorganic and organic sources. A number of studies were conducted over a period of several years at 10 field locations in Illinois. Nitrogen at rates up to 360 kg/ha added for corn ( Zea mays L.) the preceding year had no effect on soybean yields. Neither were soybean yields increased by organic sources of N such as manure or alfalfa ( Medicago sativa L.), or by combinations of organic and inorganic sources. Fertilizer N added for soybean as plow‐down, disked‐in, and side‐dressed at early flowering and at pod filling did not increase yields. Nitrogen added for soybeans planted on four dates did not increase yields. High rates of N (1800 and 1440 kg/ha), broadcast and disked‐in in the spring, decreased yield due to germination and seedling injury. Considering all the studies, yields were significantly increased in only 3 out of 133 instances and these occurred at high, uneconomical rates of N fertilizer. It is concluded that N available to the plant is not the growth factor that presently limits soybean yields in Illinois.
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Claims 8
Claim · model-written summary
Nitrogen at rates up to 360 kg/ha added for the preceding year's corn had no effect on soybean yields.
- Taxon
- soybean
Glycine maxe1 - Treatment
- Nitrogen at rates up to 360 kg/ha added for corne1
- Outcome
- soybean yieldse1
- Direction
- no effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Nitrogen at rates up to 360 kg/ha added for corn ( Zea mays L.) the preceding year had no effect on soybean yields”
Claim · model-written summary
Organic N sources such as manure or alfalfa did not increase soybean yields.
- Taxon
- soybeanGlycine maxe1
- Treatment
- organic sources of N such as manure or alfalfae1
- Outcome
- soybean yieldse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Neither were soybean yields increased by organic sources of N such as manure or alfalfa ( Medicago sativa L.), or by combinations of organic and inorganic sources”
Claim · model-written summary
Combinations of organic and inorganic N sources did not increase soybean yields.
- Taxon
- soybeanGlycine maxe1
- Treatment
- combinations of organic and inorganic sourcese1
- Outcome
- soybean yieldse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Neither were soybean yields increased by organic sources of N such as manure or alfalfa ( Medicago sativa L.), or by combinations of organic and inorganic sources”
Claim · model-written summary
Fertilizer N added for soybean as plow-down, disked-in, and side-dressed at early flowering and at pod filling did not increase yields.
- Taxon
- soybeanGlycine maxe1
- Treatment
- Fertilizer N added for soybean as plow‐down, disked‐in, and side‐dressed at early flowering and at pod fillinge1
- Outcome
- yieldse1
- Direction
- did not increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fertilizer N added for soybean as plow‐down, disked‐in, and side‐dressed at early flowering and at pod filling did not increase yields”
Claim · model-written summary
Nitrogen added for soybeans planted on four dates did not increase yields.
- Taxon
- soybeansGlycine maxe1
- Treatment
- Nitrogen addede1
- Outcome
- yieldse1
- Direction
- did not increasee1
- Qualifier
- planted on four datese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Nitrogen added for soybeans planted on four dates did not increase yields”
Claim · model-written summary
High N rates (1800 and 1440 kg/ha) broadcast and disked in during spring decreased soybean yield, attributed to germination and seedling injury.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- High rates of N (1800 and 1440 kg/ha), broadcast and disked‐in in the springe1
- Outcome
- yielde1
- Direction
- decreasede1
- Qualifier
- due to germination and seedling injurye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“High rates of N (1800 and 1440 kg/ha), broadcast and disked‐in in the spring, decreased yield due to germination and seedling injury”
t0“Soybean Yields with Direct and Residual Nitrogen Fertilization1”
Claim · model-written summary
Across all studies, yields were significantly increased by N fertilizer in only 3 of 133 instances, at high, uneconomical N rates.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- N fertilizere1
- Outcome
- yieldse1
- Direction
- increasede1
- Value
- 3 out of 133 instancese1
- Qualifier
- high, uneconomical ratese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“yields were significantly increased in only 3 out of 133 instances and these occurred at high, uneconomical rates of N fertilizer”
t0“Soybean Yields with Direct and Residual Nitrogen Fertilization1”
Claim · model-written summary
The authors conclude that N available to the plant is not the factor that presently limits soybean yields in Illinois.
- Taxon
- soybeanGlycine maxe1
- Outcome
- soybean yieldse1
- Qualifier
- N available to the plant is not the growth factor that presently limitse1
- Setting
- Illinoise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“N available to the plant is not the growth factor that presently limits soybean yields in Illinois”
The same questions in other papers
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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.