diff -ru a/inst/extdata/example_input.json b/inst/extdata/example_input.json
--- a/inst/extdata/example_input.json	2026-09-29 10:32:25
+++ b/inst/extdata/example_input.json	2026-09-29 10:32:26
@@ -1,819 +1,841 @@
 {
-    "annual_prec": 1119,
-    "arable_tograssland": 0,
-    "cba_discount_rate": 0,
-    "cba_years": 0,
-    "climate_zone": "Temperate",
-    "climate_zone_2": "Warm Temperate Dry",
-    "cropland_orgmatter": "Low, temperate/boreal, dry",
-    "cropland_orgmatter_ipcc": 0.95,
-    "cropland_system": "Long term cultivated, temperate/boreal, dry",
-    "cropland_system_ipcc": 0.8,
-    "cropland_tillage": "Full",
-    "cropland_tillage_ipcc": 1,
-    "et": 1359,
-    "farm_code": "Muheza",
-    "farm_name": "Inensive ",
-    "feed_basket": [
+  "annual_prec": 1119,
+  "arable_tograssland": 0,
+  "cba_discount_rate": 0,
+  "cba_years": 0,
+  "climate_zone": "Temperate",
+  "climate_zone_2": "Warm Temperate Dry",
+  "cropland_orgmatter": "Low, temperate/boreal, dry",
+  "cropland_orgmatter_ipcc": 0.95,
+  "cropland_system": "Long term cultivated, temperate/boreal, dry",
+  "cropland_system_ipcc": 0.8,
+  "cropland_tillage": "Full",
+  "cropland_tillage_ipcc": 1,
+  "et": 1359,
+  "farm_code": "Muheza",
+  "farm_name": "Inensive ",
+  "feed_basket": [
+    {
+      "feeds": [
         {
-            "feeds": [
-                {
-                    "feed_item_code": "53",
-                    "feed_type_code": "29",
-                    "livestock": [
-                        {
-                            "allocation": 10,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 10,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 0,
-                            "livetype_code": "7"
-                        }
-                    ]
-                },
-                {
-                    "feed_item_code": "64",
-                    "feed_type_code": "36",
-                    "livestock": [
-                        {
-                            "allocation": 85,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 85,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 90,
-                            "livetype_code": "7"
-                        }
-                    ]
-                },
-                {
-                    "feed_item_code": "82",
-                    "feed_type_code": "40",
-                    "livestock": [
-                        {
-                            "allocation": 4,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 4,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 10,
-                            "livetype_code": "7"
-                        }
-                    ]
-                },
-                {
-                    "feed_item_code": "17",
-                    "feed_type_code": "43",
-                    "livestock": [
-                        {
-                            "allocation": 1,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 1,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 0,
-                            "livetype_code": "7"
-                        }
-                    ]
-                }
-            ],
-            "season_name": "S1"
+          "feed_item_code": "53",
+          "feed_type_code": "29",
+          "livestock": [
+            {
+              "allocation": 10,
+              "livetype_code": "2"
+            },
+            {
+              "allocation": 10,
+              "livetype_code": "6"
+            },
+            {
+              "allocation": 0,
+              "livetype_code": "7"
+            }
+          ]
         },
         {
-            "feeds": [
-                {
-                    "feed_item_code": "53",
-                    "feed_type_code": "29",
-                    "livestock": [
-                        {
-                            "allocation": 13,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 13,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 12,
-                            "livetype_code": "7"
-                        }
-                    ]
-                },
-                {
-                    "feed_item_code": "64",
-                    "feed_type_code": "36",
-                    "livestock": [
-                        {
-                            "allocation": 84,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 84,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 86,
-                            "livetype_code": "7"
-                        }
-                    ]
-                },
-                {
-                    "feed_item_code": "82",
-                    "feed_type_code": "40",
-                    "livestock": [
-                        {
-                            "allocation": 1,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 1,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 2,
-                            "livetype_code": "7"
-                        }
-                    ]
-                },
-                {
-                    "feed_item_code": "17",
-                    "feed_type_code": "43",
-                    "livestock": [
-                        {
-                            "allocation": 2,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 2,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 0,
-                            "livetype_code": "7"
-                        }
-                    ]
-                }
-            ],
-            "season_name": "S2"
+          "feed_item_code": "64",
+          "feed_type_code": "36",
+          "livestock": [
+            {
+              "allocation": 85,
+              "livetype_code": "2"
+            },
+            {
+              "allocation": 85,
+              "livetype_code": "6"
+            },
+            {
+              "allocation": 90,
+              "livetype_code": "7"
+            }
+          ]
         },
         {
-            "feeds": [
-                {
-                    "feed_item_code": "53",
-                    "feed_type_code": "29",
-                    "livestock": [
-                        {
-                            "allocation": 13,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 13,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 5,
-                            "livetype_code": "7"
-                        }
-                    ]
-                },
-                {
-                    "feed_item_code": "64",
-                    "feed_type_code": "36",
-                    "livestock": [
-                        {
-                            "allocation": 82,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 82,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 85,
-                            "livetype_code": "7"
-                        }
-                    ]
-                },
-                {
-                    "feed_item_code": "82",
-                    "feed_type_code": "40",
-                    "livestock": [
-                        {
-                            "allocation": 4,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 4,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 10,
-                            "livetype_code": "7"
-                        }
-                    ]
-                },
-                {
-                    "feed_item_code": "17",
-                    "feed_type_code": "43",
-                    "livestock": [
-                        {
-                            "allocation": 1,
-                            "livetype_code": "2"
-                        },
-                        {
-                            "allocation": 1,
-                            "livetype_code": "6"
-                        },
-                        {
-                            "allocation": 0,
-                            "livetype_code": "7"
-                        }
-                    ]
-                }
-            ],
-            "season_name": "S3"
+          "feed_item_code": "82",
+          "feed_type_code": "40",
+          "livestock": [
+            {
+              "allocation": 4,
+              "livetype_code": "2"
+            },
+            {
+              "allocation": 4,
+              "livetype_code": "6"
+            },
+            {
+              "allocation": 10,
+              "livetype_code": "7"
+            }
+          ]
+        },
+        {
+          "feed_item_code": "17",
+          "feed_type_code": "43",
+          "livestock": [
+            {
+              "allocation": 1,
+              "livetype_code": "2"
+            },
+            {
+              "allocation": 1,
+              "livetype_code": "6"
+            },
+            {
+              "allocation": 0,
+              "livetype_code": "7"
+            }
+          ]
         }
-    ],
-    "feed_items": [
+      ],
+      "season_name": "S1"
+    },
+    {
+      "feeds": [
         {
-            "ammonia": 0,
-            "ammonium_nitrate": 0,
-            "ammonium_sulfate": 0,
-            "average_dbh25": 0,
-            "average_dbh2550": 0,
-            "average_dbh50": 0,
-            "c_factor": 0.01,
-            "category": "cereal",
-            "cp_content": 3.9,
-            "cp_fresh": 0,
-            "crop_coefficient": 0.533333333333333,
-            "cut_carry_fraction": 0,
-            "dap": 0,
-            "de": 0,
-            "diameter_breast": 0,
-            "dm_content": 0.3,
-            "emission_factor": 0,
-            "energy": 365,
-            "energy_dm": 407.229722191231,
-            "establishment_cost": 0,
-            "establishment_labour": 0,
-            "feed_item_code": "53",
-            "feed_item_name": "Maize (Zea mays) - stover",
-            "feed_type_code": "29",
-            "feed_type_name": "Maize",
-            "fraction_as_fertilizer": 1,
-            "fraction_as_manure": 0.9,
-            "fresh_yield": 4.4,
-            "grassman": "7",
-            "grassman_change_factor": 1.17,
-            "grassman_desc": "",
-            "harvest_index": 0.52,
-            "increase_dbh25": 0,
-            "increase_dbh2550": 0,
-            "increase_dbh50": 0,
-            "intercrop": 0,
-            "intercrop_fraction": 0,
-            "kc_initial": 0.15,
-            "kc_late": 0.3,
-            "kc_midseason": 1.15,
-            "land_cover": "7",
-            "land_cover_desc": "",
-            "landcover_c_factor": 0.15,
-            "main_n": 0.01,
-            "main_product_removal": 1,
-            "me_content": 6.9,
-            "me_fresh": 0,
-            "n_fertilizer": 0,
-            "n_fixation": 0,
-            "n_solutions": 0,
-            "npk": 0,
-            "operational_cost": 0,
-            "operational_labour": 0,
-            "residue_burnt": 0,
-            "residue_n": 0,
-            "residue_removal": 0,
-            "slope": "3",
-            "slope_desc": "",
-            "slope_length": 1,
-            "slope_p_factor": 0.22,
-            "source_type": "Residue",
-            "time_horizon": 0,
-            "trees_dhb": 0,
-            "trees_growth": 0,
-            "trees_ha": 0,
-            "trees_ha_dbh25": 0,
-            "trees_ha_dbh2550": 0,
-            "trees_ha_dbh50": 0,
-            "trees_removal": 0,
-            "urea": 0,
-            "usda_value": 20314,
-            "water_content": 10.37,
-            "wfp_blue": 0.081,
-            "wfp_green": 0.947,
-            "wfp_grey": 0.194
+          "feed_item_code": "53",
+          "feed_type_code": "29",
+          "livestock": [
+            {
+              "allocation": 13,
+              "livetype_code": "2"
+            },
+            {
+              "allocation": 13,
+              "livetype_code": "6"
+            },
+            {
+              "allocation": 12,
+              "livetype_code": "7"
+            }
+          ]
         },
         {
-            "ammonia": 0,
-            "ammonium_nitrate": 0,
-            "ammonium_sulfate": 0,
-            "average_dbh25": 0,
-            "average_dbh2550": 40,
-            "average_dbh50": 70,
-            "c_factor": 0.05,
-            "category": "grass",
-            "cp_content": 6,
-            "cp_fresh": 0,
-            "crop_coefficient": 0.6,
-            "cut_carry_fraction": 0,
-            "dap": 0,
-            "de": 0,
-            "diameter_breast": 0,
-            "dm_content": 0.29,
-            "emission_factor": 0,
-            "energy": 0,
-            "energy_dm": 0,
-            "establishment_cost": 0,
-            "establishment_labour": 0,
-            "feed_item_code": "64",
-            "feed_item_name": "Naturally occuring pasture - green fodder",
-            "feed_type_code": "36",
-            "feed_type_name": "Natural pasture",
-            "fraction_as_fertilizer": 0,
-            "fraction_as_manure": 0,
-            "fresh_yield": 45,
-            "grassman": "3",
-            "grassman_change_factor": 0.97,
-            "grassman_desc": "",
-            "harvest_index": 0.9,
-            "increase_dbh25": 0,
-            "increase_dbh2550": 2,
-            "increase_dbh50": 2,
-            "intercrop": 0,
-            "intercrop_fraction": 0,
-            "kc_initial": 0.3,
-            "kc_late": 0.75,
-            "kc_midseason": 0.75,
-            "land_cover": "10",
-            "land_cover_desc": "",
-            "landcover_c_factor": 0.05,
-            "main_n": 0.01,
-            "main_product_removal": 1,
-            "me_content": 5,
-            "me_fresh": 0,
-            "n_fertilizer": 0,
-            "n_fixation": 0,
-            "n_solutions": 0,
-            "npk": 0,
-            "operational_cost": 0,
-            "operational_labour": 0,
-            "residue_burnt": 0,
-            "residue_n": 0,
-            "residue_removal": 0,
-            "slope": "1",
-            "slope_desc": "",
-            "slope_length": 1,
-            "slope_p_factor": 0.11,
-            "source_type": "Main",
-            "time_horizon": 12,
-            "trees_dhb": 0,
-            "trees_growth": 0,
-            "trees_ha": 15,
-            "trees_ha_dbh25": 0,
-            "trees_ha_dbh2550": 9,
-            "trees_ha_dbh50": 6,
-            "trees_removal": 0,
-            "urea": 0,
-            "usda_value": 0,
-            "water_content": 0,
-            "wfp_blue": 0.002,
-            "wfp_green": 0.199,
-            "wfp_grey": 0.002
+          "feed_item_code": "64",
+          "feed_type_code": "36",
+          "livestock": [
+            {
+              "allocation": 84,
+              "livetype_code": "2"
+            },
+            {
+              "allocation": 84,
+              "livetype_code": "6"
+            },
+            {
+              "allocation": 86,
+              "livetype_code": "7"
+            }
+          ]
         },
         {
-            "ammonia": 0,
-            "ammonium_nitrate": 0,
-            "ammonium_sulfate": 0,
-            "average_dbh25": 0,
-            "average_dbh2550": 0,
-            "average_dbh50": 0,
-            "c_factor": 0.01,
-            "category": "grass",
-            "cp_content": 7.5,
-            "cp_fresh": 0,
-            "crop_coefficient": 0.916666666666667,
-            "cut_carry_fraction": 0,
-            "dap": 0,
-            "de": 0,
-            "diameter_breast": 0,
-            "dm_content": 0.15,
-            "emission_factor": 0,
-            "energy": 0,
-            "energy_dm": 0,
-            "establishment_cost": 0,
-            "establishment_labour": 0,
-            "feed_item_code": "82",
-            "feed_item_name": "Pennisetum purpureum - forage",
-            "feed_type_code": "40",
-            "feed_type_name": "Pennisetum purpureum",
-            "fraction_as_fertilizer": 0,
-            "fraction_as_manure": 0.7,
-            "fresh_yield": 105,
-            "grassman": "3",
-            "grassman_change_factor": 0.97,
-            "grassman_desc": "",
-            "harvest_index": 0.9,
-            "increase_dbh25": 0,
-            "increase_dbh2550": 0,
-            "increase_dbh50": 0,
-            "intercrop": 0,
-            "intercrop_fraction": 0,
-            "kc_initial": 0.6,
-            "kc_late": 1.05,
-            "kc_midseason": 1.1,
-            "land_cover": "9",
-            "land_cover_desc": "",
-            "landcover_c_factor": 0.01,
-            "main_n": 0.01,
-            "main_product_removal": 1,
-            "me_content": 9.88,
-            "me_fresh": 0,
-            "n_fertilizer": 0,
-            "n_fixation": 0,
-            "n_solutions": 0,
-            "npk": 0,
-            "operational_cost": 0,
-            "operational_labour": 0,
-            "residue_burnt": 0,
-            "residue_n": 0,
-            "residue_removal": 0,
-            "slope": "1",
-            "slope_desc": "",
-            "slope_length": 1,
-            "slope_p_factor": 0.11,
-            "source_type": "Main",
-            "time_horizon": 0,
-            "trees_dhb": 0,
-            "trees_growth": 0,
-            "trees_ha": 0,
-            "trees_ha_dbh25": 0,
-            "trees_ha_dbh2550": 0,
-            "trees_ha_dbh50": 0,
-            "trees_removal": 0,
-            "urea": 0,
-            "usda_value": 0,
-            "water_content": 0,
-            "wfp_blue": 0,
-            "wfp_green": 0,
-            "wfp_grey": 0
+          "feed_item_code": "82",
+          "feed_type_code": "40",
+          "livestock": [
+            {
+              "allocation": 1,
+              "livetype_code": "2"
+            },
+            {
+              "allocation": 1,
+              "livetype_code": "6"
+            },
+            {
+              "allocation": 2,
+              "livetype_code": "7"
+            }
+          ]
         },
         {
-            "ammonia": 0,
-            "ammonium_nitrate": 0,
-            "ammonium_sulfate": 0,
-            "average_dbh25": 0,
-            "average_dbh2550": 0,
-            "average_dbh50": 0,
-            "c_factor": 0,
-            "category": "other",
-            "cp_content": 16,
-            "cp_fresh": 0,
-            "crop_coefficient": 0,
-            "cut_carry_fraction": 0,
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-            "de": 0,
-            "diameter_breast": 0,
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-            "emission_factor": 0,
-            "energy": 0,
-            "energy_dm": 0,
-            "establishment_cost": 0,
-            "establishment_labour": 0,
-            "feed_item_code": "17",
-            "feed_item_name": "Concentrate (commercial)",
-            "feed_type_code": "43",
-            "feed_type_name": "Purchased",
-            "fraction_as_fertilizer": 0,
-            "fraction_as_manure": 0,
-            "fresh_yield": 0,
-            "grassman": "3",
-            "grassman_change_factor": 0.97,
-            "grassman_desc": "",
-            "harvest_index": 0,
-            "increase_dbh25": 0,
-            "increase_dbh2550": 0,
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-            "intercrop": 0,
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-            "kc_initial": 0,
-            "kc_late": 0,
-            "kc_midseason": 0,
-            "land_cover": "1",
-            "land_cover_desc": "",
-            "landcover_c_factor": 0.001,
-            "main_n": 0,
-            "main_product_removal": 0,
-            "me_content": 12.1,
-            "me_fresh": 0,
-            "n_fertilizer": 0,
-            "n_fixation": 0,
-            "n_solutions": 0,
-            "npk": 0,
-            "operational_cost": 0,
-            "operational_labour": 0,
-            "residue_burnt": 0,
-            "residue_n": 0,
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-            "slope": "1",
-            "slope_desc": "",
-            "slope_length": 0,
-            "slope_p_factor": 0.11,
-            "source_type": "Purchased",
-            "time_horizon": 0,
-            "trees_dhb": 0,
-            "trees_growth": 0,
-            "trees_ha": 0,
-            "trees_ha_dbh25": 0,
-            "trees_ha_dbh2550": 0,
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-            "urea": 0,
-            "usda_value": 0,
-            "water_content": 0,
-            "wfp_blue": 0,
-            "wfp_green": 0,
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+          "feed_item_code": "17",
+          "feed_type_code": "43",
+          "livestock": [
+            {
+              "allocation": 2,
+              "livetype_code": "2"
+            },
+            {
+              "allocation": 2,
+              "livetype_code": "6"
+            },
+            {
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+              "livetype_code": "7"
+            }
+          ]
         }
-    ],
-    "fertilizer": [
+      ],
+      "season_name": "S2"
+    },
+    {
+      "feeds": [
         {
-            "cost": 2,
-            "fertilizer_code": "4",
-            "fertilizer_desc": "Ammonium nitrate",
-            "fraction": 3,
-            "quantity": 1
-        }
-    ],
-    "grassland_implevel": "Medium",
-    "grassland_implevel_ipcc": 1,
-    "grassland_management": "Nominally managed",
-    "grassland_management_ipcc": 1,
-    "grassland_toarable": 0,
-    "land_oppcost": 0,
-    "livestock": [
-        {
-            "adult_weight": 600,
-            "annual_growth": 0,
-            "annual_milk": 3660,
-            "annual_wool": 0,
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-            "body_weight": 600,
-            "body_weight_weaning": 0,
-            "body_weight_year_one": 0,
-            "carcass_fraction": 0.48,
-            "cp_grazing": 0,
-            "cp_growth": 0,
-            "cp_lactation": 0,
-            "cp_lactmilk": 0.09,
-            "cp_maintenance": 0.6,
-            "cp_pregnancy": 12.21,
-            "distance_to_pasture": 0,
-            "energy_eggcontent": 0,
-            "energy_meatcontent": 2200,
-            "energy_milkcontent": 970,
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+      "proportion_growth_piglets_milk": 0,
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+    },
+    {
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+      "grazing_displacement": 2,
+      "herd_composition": 2,
+      "ipcc_ef_category_t1": "Other mature female-grazing",
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+      "ipcc_n_exc_category": "Other cattle",
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+      "litter_size": 0,
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+      "manureman_onfarm_grazing": "Dry lot",
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+      "me_pregnancy": 0,
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+      "time_in_stable": 1,
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+      "lw_gain_piglets": 0,
+      "proportion_growth_piglets_milk": 0,
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+    },
+    {
+      "adult_weight": 350,
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+      "ipcc_ef_category_t1": "Other young",
+      "ipcc_ef_category_t2": "Non-dairy",
+      "ipcc_meth_man_category": "Other cattle",
+      "ipcc_n_exc_category": "Other cattle",
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+      "litter_size": 0,
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+      "livetype_code": "7",
+      "livetype_desc": "Cattle - Calves",
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+      "manureman_offfarm_grazing": "Pasture / range / paddock",
+      "manureman_onfarm_grazing": "Dry lot",
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+      "me_growth": 0,
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+      "me_lactmilk": 0,
+      "me_maintenance": 0,
+      "me_pregnancy": 0,
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+      "meat_product": "beef",
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+      "lw_gain_piglets": 0,
+      "proportion_growth_piglets_milk": 0,
+      "n_manure_content": 0.029
+    }
+  ],
+  "purchased_bedding": 0,
+  "purchased_compost": 0,
+  "purchased_manure": 0,
+  "purchased_organic_n": 0,
+  "rain_length": 6,
+  "region": "AFRICA",
+  "seasons": [
+    {
+      "season_length": 106,
+      "season_name": "S1"
+    },
+    {
+      "season_length": 136,
+      "season_name": "S2"
+    },
+    {
+      "season_length": 123,
+      "season_name": "S3"
+    }
+  ],
+  "soil_bulk": 1.26,
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+  "soil_clay": 41,
+  "soil_depth": 2,
+  "soil_description": "Lixisol",
+  "soil_k_value": 0.19,
+  "soil_n": 2.06,
+  "waste_consume_meat": 0,
+  "waste_consume_milk": 2,
+  "waste_distribution_meat": 3,
+  "waste_distribution_milk": 3,
+  "waste_processing_meat": 5,
+  "waste_processing_milk": 5,
+  "waste_production_meat": 3,
+  "waste_production_milk": 3
 }