wefnexus 1.0.0

Initial CRAN release

Water Module (7 functions)

• water_use_efficiency() - WUE (kg/ha/mm)
• water_productivity() - Physical and economic WP (kg/m3)
• water_footprint() - Green, blue, grey WF decomposition
• irrigation_efficiency() - Conveyance, application, overall, consumptive
• crop_water_stress_index() - CWSI bounded 0-1
• crop_water_productivity() - CWP (kg/m3) from ET
• depleted_fraction() - Basin-level water allocation metric

Energy Module (10 functions)

• energy_input() - 15-component energy input aggregation
• energy_output() - Grain + straw energy with customizable coefficients
• energy_use_efficiency() - EUE ratio
• eroi() - Energy Return on Investment with interpretation
• energy_productivity() - Yield per MJ input
• energy_intensity() - MJ per kg yield
• specific_energy() - MJ/ha/day for duration comparisons
• net_energy() - Energy balance (output minus input)
• energy_profitability() - Economic return per MJ
• human_energy_profitability() - Labour energy amplification ratio

Food Module (8 functions)

• food_productivity_index() - Composite yield-protein-calorie index
• crop_yield_index() - Relative to check treatment
• harvest_index() - Economic to biological yield ratio
• land_equivalent_ratio() - Intercropping advantage (LER)
• system_productivity_index() - Multi-crop system equivalent
• caloric_yield() - kcal/ha output
• protein_yield() - kg protein/ha
• production_efficiency_index() - Yield per unit cost

Nutrient Module (8 functions)

• agronomic_efficiency() - AE (kg yield increase/kg nutrient)
• physiological_efficiency() - PE (yield/uptake increase)
• recovery_efficiency() - RE (uptake increase/applied)
• partial_factor_productivity() - PFP (total yield/applied)
• internal_utilization_efficiency() - IUE (yield/total uptake)
• nutrient_harvest_index() - NHI (grain/total plant nutrient)
• nutrient_balance() - N-P-K input-output balance sheet
• nutrient_use_efficiency() - Comprehensive single-call NUE report

Carbon Module (7 functions)

• carbon_footprint() - Source-wise CF with IPCC AR6 GWP defaults
• carbon_efficiency() - Yield per kg CO2-eq
• carbon_sustainability_index() - CSI with sequestration offset
• ghg_emission() - N2O/CH4/CO2 estimation (IPCC Tier 1)
• soil_carbon_stock() - SOC stock (Mg C/ha)
• carbon_sequestration_rate() - Annual SOC change
• global_warming_potential() - GWP with AR6 values (100yr and 20yr)

Nexus Integration (8 functions)

• normalize_minmax() - Min-max 0-1 scaling with inverse option
• normalize_zscore() - Z-score standardization
• nexus_index() - Weighted composite WEFNC index
• nexus_tradeoff() - Correlation-based trade-off matrix
• nexus_radar() - Spider/web chart visualization
• nexus_heatmap() - Treatment x dimension heatmap
• nexus_sustainability_score() - Categorized sustainability assessment
• nexus_summary() - One-call complete nexus analysis from raw data

Dataset

• arid_pulse_nexus - 6 CA treatments x 26 variables from western Rajasthan

Technical Notes

• GWP defaults updated to IPCC AR6: CH4 = 27, N2O = 273 (100-yr)
• India-specific grid electricity EF: 0.82 kg CO2/kWh (CEA 2023)
• All functions use verbose = TRUE parameter (CRAN compliant)
• All @return tags present in documentation
• No cat()/print() outside if(verbose) blocks
• All examples executable (no \dontrun)