[ { "factor_id": "peas-rhizobium-inoculation", "crop_id": "peas", "factor": "Rhizobium leguminosarum inoculation and dual inoculant", "factor_category": "Biological inputs", "direction": "positive", "effect_type": "yield_gain", "effect_size": 17.5, "effect_unit": "%", "ci_lower": 12.0, "ci_upper": 23.0, "conditions": "Inoculation with Rhizobium leguminosarum bv. viciae (granular or liquid) on soils with low native rhizobial populations or virgin pulse land.", "study_count": 32, "evidence_type": "field_trial", "evidence_strength": "High", "prairie_relevance": "high", "source_title": "Inoculation of field pea with Rhizobium leguminosarum and PGPR strains across Saskatchewan soils", "source_url": "https://doi.org/10.4141/cjps2007-034", "notes": "Provides up to 80% of crop nitrogen demand via biological nitrogen fixation (BNF) without synthetic N costs.", "potential_yield_effect": 17.5 }, { "factor_id": "peas-biostimulant-pgpr-amino", "crop_id": "peas", "factor": "Biostimulants: Penicillium bilaiae & amino acid foliar blends", "factor_category": "Biostimulants", "direction": "positive", "effect_type": "yield_gain", "effect_size": 10.4, "effect_unit": "%", "ci_lower": 6.0, "ci_upper": 15.0, "conditions": "Co-inoculation of phosphate-solubilizing fungus Penicillium bilaiae with Rhizobium at seeding.", "study_count": 19, "evidence_type": "field_trial", "evidence_strength": "Moderate", "prairie_relevance": "high", "source_title": "Phosphate-solubilizing Penicillium bilaiae and rhizobial co-inoculation on field pea phosphorus uptake and yield", "source_url": "https://doi.org/10.4141/P94-061", "notes": "Mobilizes bound soil calcium phosphates, stimulating earlier nodulation and root branching.", "potential_yield_effect": 10.4 }, { "factor_id": "peas-starter-phosphorus", "crop_id": "peas", "factor": "Starter phosphorus placement (15-30 kg P2O5/ha)", "factor_category": "Nutrients", "direction": "positive", "effect_type": "yield_gain", "effect_size": 13.2, "effect_unit": "%", "ci_lower": 8.5, "ci_upper": 18.0, "conditions": "Side-banded or seed-placed phosphorus (up to safe seed-placed limits of 15-20 kg P2O5/ha) on low-P Prairie soils.", "study_count": 27, "evidence_type": "field_trial", "evidence_strength": "High", "prairie_relevance": "high", "source_title": "Phosphorus fertilizer rate, placement and cultivar effects on field pea production in the northern Great Plains", "source_url": "https://doi.org/10.4141/cjps2010-015", "notes": "Essential for root energy metabolism and rhizobial ATP requirement for nitrogenase activity.", "potential_yield_effect": 13.2 }, { "factor_id": "peas-aphanomyces-root-rot", "crop_id": "peas", "factor": "Aphanomyces euteiches root rot disease impact", "factor_category": "Disease management", "direction": "negative", "effect_type": "yield_loss", "effect_size": -48.0, "effect_unit": "%", "ci_lower": -65.0, "ci_upper": -30.0, "conditions": "Wet soil conditions in infested fields (>100 oospores/g soil) under short pulse rotations (<6-8 years).", "study_count": 23, "evidence_type": "field_trial", "evidence_strength": "High", "prairie_relevance": "high", "source_title": "Epidemiology and management of Aphanomyces root rot of field pea in Western Canada", "source_url": "https://doi.org/10.1080/07060661.2018.1539001", "notes": "Causes severe honeycomb root decay, leaf chlorosis, and total crop failure in flooded depressions.", "potential_yield_effect": -48.0 }, { "factor_id": "peas-seeding-density", "crop_id": "peas", "factor": "Plant population density (80-90 plants/m2)", "factor_category": "Crop establishment", "direction": "positive", "effect_type": "yield_gain", "effect_size": 14.0, "effect_unit": "%", "ci_lower": 9.0, "ci_upper": 19.0, "conditions": "Targeting 80-90 viable plants/m2 (7-8 plants/ft2) at 4-6 cm seeding depth into moisture.", "study_count": 25, "evidence_type": "field_trial", "evidence_strength": "High", "prairie_relevance": "high", "source_title": "Field pea seeding rate, depth and cultivar effects on stand establishment and grain yield", "source_url": "https://doi.org/10.4141/cjps2008-044", "notes": "Maintains inter-plant vine intertwining in semi-leafless cultivars, reducing harvest lodging.", "potential_yield_effect": 14.0 }, { "factor_id": "peas-flowering-heat-stress", "crop_id": "peas", "factor": "Heat stress during flowering and pod development (>28°C)", "factor_category": "Stress", "direction": "negative", "effect_type": "yield_loss", "effect_size": -29.0, "effect_unit": "%", "ci_lower": -40.0, "ci_upper": -18.0, "conditions": "Temperatures exceeding 28°C during full bloom causing ovule abortion and pod dropping.", "study_count": 20, "evidence_type": "review", "evidence_strength": "High", "prairie_relevance": "high", "source_title": "High temperature stress effects on flower retention, ovule fertility and seed yield in Pisum sativum", "source_url": "https://doi.org/10.1016/j.agwat.2016.06.012", "notes": "Early spring seeding (late April/early May) avoids flowering during peak July heatwaves.", "potential_yield_effect": -29.0 }, { "factor_id": "peas-organic-yellow-green-premium", "crop_id": "peas", "factor": "Certification & Profitability: Certified Organic yellow/green field pea price premium", "factor_category": "Economics & Certification", "direction": "positive", "effect_type": "price_premium", "effect_size": 95.0, "effect_unit": "% premium", "ci_lower": 75.0, "ci_upper": 125.0, "conditions": "Certified organic yellow and green peas command $18.00–$26.00/bu compared to conventional baseline of $9.50–$12.50/bu (+75% to +125% premium) for plant-protein fractionation and food export.", "study_count": 14, "evidence_type": "economic_benchmark", "evidence_strength": "High", "prairie_relevance": "high", "source_title": "Saskatchewan Organic Pulse Production Economics & Plant-Based Protein Market Analysis", "source_url": "https://www.saskpulse.com/", "notes": "Field peas fix 100% of their nitrogen requirement, eliminating fertilizer input costs ($150-180/ac). Organic pea yields are 80-90% of conventional in absence of root rot, delivering +40% to +80% higher net margins per acre.", "potential_yield_effect": -15.0 } ]