fertilization · Quality: protein · Lathyrus oleraceus (pea)
29 claims from these papers; 4 citations between them.
Papers whose results differ, checked claim by claim 5
5 pairs of papers on this question report results that differ: an effect in one paper, the opposite effect or no effect in the other. Two model reviewers reading both claims accepted each pair.
- EFFECTS OF NITROGEN AND MOISTURE ON YIELD AND PROTEIN IN FIELD PEAS (1974)
increaseNitrogen fertilization markedly increased pea plant weight, seed yield and protein content in the growth room.
The interacting effects of irrigation, sowing date and nitrogen on water status, protein and yield in pea (Pisum sativum L.) (2022)decreaseNitrogen fertilizer application significantly reduced pea grain protein and seeds per pod.
What separates themTest system: controlled environment · fieldCompare the two papers → - Nitrogen Effects on Growth, Seed Yield, and Protein of Seven Pea Cultivars1 (1975)
increaseFertilization with 50 ppm N increased total seed protein of five pea cultivars by 47 to 109%.
The interacting effects of irrigation, sowing date and nitrogen on water status, protein and yield in pea (Pisum sativum L.) (2022)decreaseNitrogen fertilizer application significantly reduced pea grain protein and seeds per pod.
What separates themTest system: controlled environment · fieldCompare the two papers → - MANAGEMENT FOR YIELD AND PROTEIN OF FIELD PEAS IN SASKATCHEWAN (1974)
increasenitrogen fertilizers increased protein content.
The interacting effects of irrigation, sowing date and nitrogen on water status, protein and yield in pea (Pisum sativum L.) (2022)decreaseNitrogen fertilizer application significantly reduced pea grain protein and seeds per pod.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - The interacting effects of irrigation, sowing date and nitrogen on water status, protein and yield in pea (Pisum sativum L.) (2022)
decreaseNitrogen fertilizer application significantly reduced pea grain protein and seeds per pod.
Seeding rate and sulfur drive field pea yields in the Maritime region of Canada (2023)increasePre-plant nitrogen slightly increased field pea seed protein.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - The interacting effects of irrigation, sowing date and nitrogen on water status, protein and yield in pea (Pisum sativum L.) (2022)
decreaseNitrogen fertilizer application significantly reduced pea grain protein and seeds per pod.
Genotypische Variation für im Boden verbleibenden mineralischen Stickstoff nach dem Anbau von Ackerbohnen und Erbsen (2004)increaseNitrogen fertilisation increased grain protein concentration and protein yield in pea.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
How these papers cite each other
4 citations between these papers: 4 on the same side, 0 across the two sides.
- Positive result
- Negative result or no effect
- Citation, pointing to the cited paper
- Citation across the two sides
- Larger circle: more citations overall
Years run left to right. Citations come from the papers’ OpenAlex reference lists. Hover a paper to bring forward its citations; click it to open the paper.
Papers reporting a positive result 26
EFFECTS OF NITROGEN AND MOISTURE ON YIELD AND PROTEIN IN FIELD PEAS · 1974
- positive
MANAGEMENT FOR YIELD AND PROTEIN OF FIELD PEAS IN SASKATCHEWAN · 1974
- positive
Nitrogen Effects on Growth, Seed Yield, and Protein of Seven Pea Cultivars1 · 1975
- positive
EFFECTS OF RHIZOBIUM AND NITROGEN FERTILIZER ON NITROGEN FIXATION AND GROWTH OF FIELD PEAS · 1978
- positive
Effect of potassium fertilization on yield and seeds quality of Pea Enword cv. · 2004
- positive
- positive
- positive
- positive
- positive
- positive
- positive
- positive
- positive
- positive
- positive
Effect of Organic Manures and Biofertilizers on Growth, Yield and Quality of Pea (Pisum sativum L.) · 2022
- positive
Efficiency of peas Premier cultivation depending on applied mineral fertilizers and sowing rates · 2023
- positive
- positive
- positive
- positive
- positive
Seeding rate and sulfur drive field pea yields in the Maritime region of Canada · 2023
- positive
- positive
- positive
Effect of Integrated Nutrient Management on growth, yield and quality of field pea · 2025
- positive
Study of integrated nutrient management on quality attributes in garden pea (Pisum sativus L.) · 2025
- positive
- positive
- positive
Papers reporting a negative result or no effect 1
A paper is on the positive side when any of its claims here is positive. Claims are grouped by organism, treatment and what was measured or targeted. Claims that compare genotypes are left out; a claim about lacking a nutrient counts the other way round in that nutrient’s question. “Results differ” marks a question where two model reviewers, reading both claims, accepted at least one pair of papers whose results differ.