Agronomic and Economic Benefits of Rotating Corn with Soybean and Spring Wheat under Different Tillage in Eastern Canada
Bibliographic record
Abstract
Agronomic and economic performance of the corn ( Zea mays L.)–soybean [ Glycine max (L.) Merr.] rotation is well documented, but few studies have investigated the addition of spring wheat ( Triticum aestivum L.) to this rotation, particularly at the northern limit of corn and soybean production in North America. A 6‐yr field study was initiated in 1999 on a clay soil in eastern Canada to identify the best crop rotation (continuous corn, continuous soybean, corn–soybean, corn–corn–soybean, corn–soybean–spring wheat, or corn–spring wheat–soybean) under moldboard plow (MP) and reduced tillage (RT) in terms of grain yield, soil aggregate distribution, and annual net returns. To isolate the effect of annual climatic conditions, all crop phases of each rotation were present each year for a total of 13 rotation sequences within each soil tillage practice. Corn grown in rotation had greater yield (+0.6 to +0.9 Mg ha −1 ) than continuous corn or second‐year corn regardless of soil tillage. Soybean grown once every 3 yr had consistently greater yields (+0.20 Mg ha −1 ) than continuous soybean. The addition of spring wheat in the rotation improved both corn and soybean yields compared with either continuously cropped. The RT management did not affect crop yield but increased the soil macro‐aggregation only when corn was present in the rotation. Economic analysis revealed that continuous soybean, the 3‐yr corn–soybean–spring wheat with wheat straw being sold, and the 2‐yr corn–soybean were the most profitable and most efficient rotations when averse risk is considered. Core Ideas Corn in rotation yielded 0.7 Mg ha −1 more than continuous corn, regardless of soil tillage. Soybean grown once every 3 yr had consistently higher yields than continuous soybean. Including spring wheat in the corn and soybean continuous cropping improved corn and soybean yields. Reduced tillage did not affect crop yield but improved soil macro‐aggregation when corn grown continuously or in rotation. Continuous soybean, corn–soybean, and 3‐yr rotation with corn, soybean, and spring wheat with wheat straw being sold were the most efficient economic rotations when considering the risk aversion.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".