Abstract
Field studies were conducted to determine the nitrogen (N) fertilizer replacement value (NFRV) when soybean (Glycine max [L.] Merrill) preceded corn (Zea mays L.) in the rotation (S-C), compared to corn preceding corn (C-C). Large, replicated blocks of soybean and corn were established in 1993 and 1994 near Elora, Ontario. In the following year, each large block was subdivided into smaller plots. Fertilizer N was applied at six rates from 0 to 200 kg N ha −1 to the second-year corn crop. Corn grain yield responses to fertilizer N were fitted by quadratic regression. Maximum economic rate of N was calculated for each crop sequence and NFRV's were determined. Corn yields were consistently higher when grown after soybean (S-C) than after corn (C-C). Maximum corn yields were 10.4 and 12.3 Mg ha −1 in 1994 and 1995, respectively. NFRVs for S-C, compared to C-C, were 41 and 59 kg N ha −1 in the two years. As a result of these studies and numerous other experiments, recommended fertilizer N rates have been changed to 30 kg N ha −1 less for S-C than for C-C in central Ontario. Key words: Nitrogen credit, corn, soybean, fertilizer N, replacement value, crop rotation
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 6
Claim · model-written summary
Corn yields were higher after soybean than after corn.
- Taxon
- Corn
Zea mays subsp. mayse0 - Treatment
- after soybean (S-C)e0
- Outcome
- Corn yieldse0
- Direction
- highere0
- Comparator
- after corn (C-C)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn yields were consistently higher when grown after soybean (S-C) than after corn (C-C).”
Claim · model-written summary
Maximum corn yield was 10.4 Mg ha −1 in 1994.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- Maximum corn yieldse0
- Direction
- Maximume0
- Value
- 10.4e0
- Qualifier
- 1994e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum corn yields were 10.4 and 12.3 Mg ha −1 in 1994 and 1995, respectively.”
t0“corn”
Claim · model-written summary
Maximum corn yield was 12.3 Mg ha −1 in 1995.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- Maximum corn yieldse0
- Direction
- Maximume0
- Value
- 12.3 Mg ha −1e0
- Qualifier
- 1995e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum corn yields were 10.4 and 12.3 Mg ha −1 in 1994 and 1995, respectively.”
t0“corn”
Claim · model-written summary
The N fertilizer replacement value after soybean was 41 kg N ha −1 in the first year.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NFRVs for S-C, compared to C-C, were 41 and 59 kg N ha −1 in the two years.”
t0“corn”
Claim · model-written summary
The N fertilizer replacement value after soybean was 59 kg N ha −1 in the second year.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- NFRVse0
- Value
- 59 kg N ha −1e0
- Qualifier
- two yearse0
- Comparator
- C-Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NFRVs for S-C, compared to C-C, were 41 and 59 kg N ha −1 in the two years.”
t0“corn”
Claim · model-written summary
Recommended nitrogen fertilizer rate is 30 kg N ha −1 lower after soybean than corn.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- recommended fertilizer N ratese0
- Direction
- lesse0
- Value
- 30 kg N ha −1e0
- Comparator
- C-Ce0
- Setting
- central Ontarioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“recommended fertilizer N rates have been changed to 30 kg N ha −1 less for S-C than for C-C in central Ontario.”
t0“corn”
The same questions in other papers
Glycine max · yield · Zea mays (maize)Positive and negative results
154 papers in the same direction as this paper · 18 in the opposite direction · 7 reporting no difference from an alternative
- positive
- positive
- no effect
176 papers more in this group
See all 180 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.