Pelletized organo-mineral fertilizer product as a nitrogen source for potato production
Bibliographic record
Abstract
Replacement of mineral fertilizer with organo-mineral fertilizer products made with animal manures is one strategy for reducing the environmental impact of agricultural production. This study evaluated a pelletized organo-mineral fertilizer product with a nutrient analysis of approximately 7-4-4 produced from composted solid poultry, solid dairy and liquid hog manure as a N source for processing potato (Solanum tuberosum L.) production in Atlantic Canada. The availability of N in the organo-mineral fertilizer product was estimated, and tuber yield, size distribution and quality parameters and soil NO 3 -N content at harvest were compared at similar application rates of N as mineral or organo-mineral fertilizer. Field trials were conducted in 2000 to 2002 to compare different rates of mineral (0–200 kg N ha -1 as NH 4 NO 3 ) or organo-mineral (0–3 t product ha -1 ) fertilizer band-applied at planting, followed by split applications of variable rates of mineral fertilizer. Apparent recovery of N from the mineral fertilizer, estimated as the slope of the regression of plant N accumulation against the rate of N applied and expressed as a percentage, was 65, 33 and 78% in 2000, 2001 and 2002, respectively. Apparent recovery of total N in the organo-mineral fertilizer was 6 0 , 26 and 57% in 2000, 2001 and 2002, respectively. Fertilizer N equivalency of the total N in the organo-mineral fertilizer, estimated as the apparent recovery of organo-mineral fertilizer N divided by apparent recovery of mineral fertilizer N and expressed as a percentage, was 92, 79 and 73% in 2000, 2001 and 2002, respectively. Application of equivalent rates of N as mineral or organo-mineral fertilizer at planting generally resulted in comparable values of tuber yield, size distribution and quality parameters and soil NO 3 -N content at tuber harvest. We recommend application of 1.5 t ha -1 of organo-mineral fertilizer at planting, with additional mineral fertilizer applied as a split application if warranted, as a suitable N source for processing potato production. Key words: Solanum tuberosum, yield, tuber size, tuber nitrate, tuber specific gravity, soil nitrate
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".