LIT_100: Lawton (2013) — VUW PhD, the NZ food land-yield method behind OT_190's Table 12

LIT_100: Lawton (2013) — VUW PhD, the NZ food land-yield method behind OT_190's Table 12

Source

doi:10.26686/wgtn.17012801 — original publication (opens in a new tab; the file is not redistributed)

Summary

Ella Lawton’s 2013 PhD thesis (Victoria University of Wellington) builds an ecological-footprint method expressed in local New Zealand hectares (NZha) and applies it to nine consumption categories across five NZ communities. For the Neobiome project its value is narrow and specific: it is the upstream source of the food land-yield coefficients that OT_190 (Millar & Bould 2015) “modified” for its Blueskin/Karitane whole-diet land requirement of ~0.49 ha/person. Retrieving it resolves one of OT_190’s three defects and, importantly, refutes the working hypothesis about a second.

The food footprint is built from FAOSTAT 2007 national consumption data and per-hectare yields calculated by James Richardson (2012). The abstract’s own headline finding is directly relevant to the corpus: “Food was found to be the predominant driver of a household’s footprint,” and within food, “use of commercial land for growing, on-farm inputs and food processing made up the largest portion.” That corroborates OT_190’s structural finding that a whole-diet land footprint is dominated by animal products, independently of the disputed arithmetic.

Key claims

- claim: "ON-FARM ENERGY EF (Table 4.9, all-NZ 2007): dairy products 0.1302 NZha/t, meat 0.1064 NZha/t, fruit 0.0055, vegetables 0.0054. Verbatim: 'Milk and milk products have the highest energy inputs of all food groups with an ecological footprint of 0.1302ha/t of milk. Meat is a close second with an EF of 0.1064ha/t, and fruit and vegetables are much lower at 0.0050ha/t.' [verified verbatim against the raw]"
  source_location: "Lawton (2013), §4.3.3 On-farm Energy, Table 4.9 'The EF of on-farm activities for 2007 for all NZ food', p. 101."
- claim: "MEAT YIELDS (Appendix 3, Table 6, kg of product per hectare and individual NZha EF): bovine meat 328.97 kg/ha (0.0969), meat other 917.94 (0.0041), MUTTON AND GOAT MEAT 231.50 kg/ha (0.0997), pig meat 1,268.18 (0.0179), animal fats 589.85 (0.0234). Total meat 424,629 t = 100.43 kg/cap, EF 0.2420 NZha. The lowest four-legged-meat yield in the thesis is mutton/goat at 231.50 kg/ha; 165 kg/ha does NOT appear anywhere as a meat yield. [verified verbatim against the raw]"
  source_location: "Lawton (2013), Appendix 3, Table 6 'EF for meat and meat products consumed in NZ in 2007', p. 311."
- claim: "DAIRY YIELDS ON A PRODUCT-WEIGHT / LIQUID-MILK BASIS (Appendix 3, Table 8): butter/ghee 468.13 kg/ha (0.0198), cheese 1,365.26 (0.0036), cream 1,593.65 (0.0001), MILK excluding butter 9,960.30 kg/ha (0.0103). Total dairy 495,642 t = 117.22 kg/cap, EF 0.0338 NZha. The dairy demand (117.22 kg/cap) and yields are matched product-for-product; there is NO milk-solids conversion — milk is reported at 9,960 kg/ha as liquid milk (confirmed in text: 'the NZ average is 9,960kg/NZha'). [verified verbatim against the raw]"
  source_location: "Lawton (2013), Appendix 3, Table 8 'EF for dairy products consumed in NZ in 2007', p. 311; liquid-milk yield ('the NZ average is 9,960kg/NZha') also stated pp. 191-192."
- claim: "AVERAGE YIELD BY LAND TYPE (Figure 4.3 + text): 'one hectare of fishing land produces 30kg of food, whilst one hectare of grazing land produces 1,872kg of animal products. Crop land has the highest average yield of 2,680kg of plant-based products per hectare.' [verified verbatim against the raw]"
  source_location: "Lawton (2013), §4.3.4 Total Growing Land, Figure 4.3 and accompanying text, pp. 100-101."
- claim: "PER-PERSON FOOD LAND (Table 4.8, food derived from animals, 2007): crop land 261.32 kg/person/yr = 0.0975 individual NZha; grazing land 572.95 kg = 0.3061 NZha; fishing land 26.18 kg = 0.8751 NZha; total 860.45 kg/person = 1.2787 individual NZha. [verified verbatim against the raw]"
  source_location: "Lawton (2013), Table 4.8 'Total grazing, crop and fishing land required for food derived from animals consumed in 2007', p. 99."
- claim: "POULTRY AND EGGS (Appendix 3, Table 7): poultry meat 1,406.28 kg/ha (0.0247 NZha), eggs 1,599.19 kg/ha (0.0058). Total 184,668 t = 43.67 kg/cap, EF 0.0303. [verified verbatim against the raw]"
  source_location: "Lawton (2013), Appendix 3, Table 7 'EF for poultry and eggs consumed in NZ in 2007', p. 311."
- claim: "YIELD PROVENANCE: the food yields are NOT primary field measurements. Verbatim: 'Yield calculations in the next section were carried out by James Richardson (2012) and further detail is provided in tables 6 to 8 in appendix 3.' Consumption is FAOSTAT 2007 national data. These are all-NZ national averages, not community-measured yields. [verified verbatim against the raw]"
  source_location: "Lawton (2013), §4.3.4 Grazing Land, p. 98; Appendix 3 table footnotes (FAO 2007), pp. 309-311."

Neobiome Intelligence relevance

Feeds self_sufficiency_calculation, d02_smart_food_systems and i02_food_security_sustainable_agriculture as the upstream provenance for OT_190’s land coefficients — a cross-check on where OT_190’s Table 12 numbers came from, not a new model input.

This ingest was retrieved specifically to resolve OT_190’s three defects. The verified result is split, and the honest reading matters:

OT_190 defect	What Lawton settles	Verdict
D1 — yields not measured	OT_190’s Table 12 four-legged-meat yield of 230 kg/ha is Lawton’s mutton/goat yield of 231.50 kg/ha (Table 6), a national FAO/Richardson-derived figure, rounded. OT_190’s own measured foodshed yield of 165 kg/ha does not appear anywhere in Lawton.	RESOLVED — provenance confirmed. OT_190 assumed a national yield ~40% above what it measured locally.
D3 — suspected milk-solids unit mismatch	Lawton reports dairy on a product-weight / liquid-milk basis (milk 9,960 kg/ha liquid; butter, cheese, cream as separate products), with demand of 117.22 kg/cap matched product-for-product. Lawton uses no milk-solids basis and contains no “988 kg/ha” figure or any “milk solids rather than raw milk liquid” statement.	NOT resolved — hypothesis refuted. the ingest process’s expected “milk-solids basis resolves the mismatch” is not supported by Lawton. See Notes.
D2 — dairy row arithmetic	Internal to OT_190; Lawton is silent.	Unchanged — remains.

Consequence for OT_190: it stays contested. Defect 1’s provenance is now documented, but the dairy question (D3) is not closed the way the retrieval brief expected — if anything Lawton makes it sharper (see Notes). Continue to treat 0.49 ha/person as a cross-check, not a model input.

Independently useful, defect-free figures this thesis contributes to the corpus:

1. A national-average NZ food land benchmark: ~1.28 NZha/person for food derived from animals (crop 0.0975 + grazing 0.3061 + fishing 0.8751; Table 4.8) — but note fishing land dominates (68%) and is a global-average GFN estimate, so the terrestrial per-person food land is far smaller.
2. Grazing land yields ~1,872 kg of animal products/ha vs crop land ~2,680 kg of plant food/ha (Figure 4.3) — a national counterpart to OT_190’s foodshed-specific yields.
3. On-farm energy EFs (dairy 0.1302, meat 0.1064 NZha/t) confirming animal products carry ~3x the per-tonne footprint of plant food — the mechanism behind “81% of a whole-diet footprint is meat + dairy.”

Notes

• The milk-solids hypothesis is refuted by the raw, and this is the single most important finding of the ingest. The retrieval brief expected Lawton to confirm a dairy yield of “988 kg/ha on a milk-solids basis.” It does not. Lawton’s dairy yields are product-weight (milk at 9,960 kg/ha liquid). Two readings follow, and neither is “OT_190 is fine”: (a) if OT_190’s ~988 kg/ha dairy yield is a milk-solids conversion Millar & Bould applied to Lawton’s liquid figure, then applying it against Lawton’s product-weight demand of 117.2 kg/cap is a basis mismatch introduced by OT_190, not inherited from Lawton, and the dairy footprint is likely overstated; (b) confirming which of the two it is needs OT_190’s own Table 12 dairy row, not Lawton. Either way, Defect 3 stays open and OT_190 stays contested.
• Year: the thesis title page reads 2013; OT_190 and RT_395 cite it as “Lawton (2012)” (likely the submission/pre-publication year). Same document, VUW, DOI 10.26686/wgtn.17012801.
• These yields are national, not local. Consumption is FAOSTAT 2007; yields are Richardson (2012). Read them as all-NZ averages. This is exactly why OT_190’s use of them for a specific Otago foodshed is a “modified” borrowing rather than a measurement.
• The “milk solids” string that does appear in the raw (p. 271) is inside a speculative future-scenario narrative about the fictional collapse of a Tarras dairy economy in 2020, not a methods statement — checked and excluded.
• Scope read: only Ch. 4 (food) and Appendix 3 were read verbatim. The thesis’s community survey, travel, housing, energy and holiday footprints were not ingested; if a household-level NZ footprint benchmark is later needed, this source is worth a second pass.

Research targets

Documents to retrieve

• None opened. The retrieval that mattered (Lawton) is this ingest.

Research gaps

• Recorded here, not raised as new RTs (per the batch’s minimise-new-RTs rule):
  • OT_190’s Table 12 dairy row basis — resolving Defect 3 fully needs OT_190’s own dairy yield figure and its conversion note, not more external retrieval. Tracked on the OT_190 page, which stays contested.
  • Richardson (2012) — the actual origin of Lawton’s per-hectare yields is a further-upstream reference cited inside this thesis. Not worth retrieving unless the national yield figures themselves become a model input; noted only for provenance completeness.

Connections

Links to

Sources (1): OT_190

Referenced by

Concepts (1): Self-Sufficiency Calculation Framework

Sources (1): OT_190