NEOBIOME

OT_168: McPartland et al. (2003) 'Hemp production in Aotearoa' (NZHIA) — measured NZ multi-site hemp trials

Properties4
typesource
source_typeot
year2003
topicsfood_systems_agriculture, nz_specific

12 min read

OT_168: McPartland et al. (2003) 'Hemp production in Aotearoa' (NZHIA) — measured NZ multi-site hemp trials

Source

doi:10.1300/J237v09n01_12 — original publication (opens in a new tab; the file is not redistributed)

McPartland, Cutler & McIntosh (2003) — Hemp production in Aotearoa (NZHIA / JIHA)

Measured NZ multi-site hemp trial data — the corroborator that firms OT_112's compiled hemp seed range, on the OIL/oilseed path (protein NOT measured)

A peer-reviewed Journal of Industrial Hemp “Hemp Production Notes” article (accepted Nov 2003) by John McPartland (UNITEC), Steve Cutler (Lincoln University) and Donald McIntosh (Chair, NZ Hemp Industries Association), reporting NZ’s first two seasons of licensed hemp cultivation: 11 sites / 55 ha (2001-02) rising to 19 sites (2002-03), 11 European/North-American cultivars, across a wide range of NZ latitudes, climates and soils. It supplies measured multi-site NZ yields: seed averaging 950–1,800 kg/ha (max 2,800) and fibre stalk biomass (dry matter) averaging 6,000–11,000 kg/ha (max 13,900). The seed’s food value here is oil — cold-pressed hemp seed oil bottled and sold as a food product. ⚠ Seed protein is QUALITATIVE only (“high in protein and omega-3 fatty acids”) — this report contains no measured protein %; protein/fatty-acid profiling is named as future work. So this firms the hemp seed-yield (oilseed) figure, not a hemp protein constant.

Summary

The first two seasons (2001-2003) of legally-licensed industrial-hemp cultivation in New Zealand, written up for the Journal of Industrial Hemp’s regional “Hemp Production Notes” series by three named authors (an academic agronomist, a Lincoln University teacher-fellow running the trials, and the NZHIA chair). The measured trial data — drawn from Cutler (2003) and McIntosh (2003) End-of-Season Reports to the Industrial Hemp Licensing Authority — cover 11 sites over 55 ha in the first season and 19 sites in the second, testing 11 cultivars across NZ’s full latitude/climate/soil diversity. Its value to Neobiome is as a measured NZ multi-site corroborator on the food/oilseed path: it firms the compiled hemp seed-yield range in OT_112 (0.8–1.0 t/ha) with a measured 0.95–1.8 t/ha (max 2.8) envelope, and independently restates the LUC 1–3 arable land-class gate for annual crops. The report is explicit that hemp seed’s food product in NZ is cold-pressed oil; seed protein is described only qualitatively, with quantitative protein/fatty-acid profiling flagged as future work — so it does not supply a hemp protein number.

Key claims

- claim: "TRIAL SCOPE (measured NZ multi-site). 'The NZ Ministry of Health licensed the importation of low-THC hemp seed in 2001. The first hemp trials began the same year, at 11 sites around NZ, covering a total of 55 ha (see Figure 1). The second season, 2002-2003, involved 19 sites (Figure 1). The hemp trials have evaluated plant growth and yield as a factor of cultivar, site location, local climate, and agronomic variables (sowing date, seeding density, fertilizer regimes, etc.).' Eleven cultivars tested, all from Europe or North America: 'Anka', 'Carmen', 'Fasamo', 'Felina', 'Finola', 'Futura 77', 'Kompolti', Uniko B, 'USO 14', 'USO 31', 'Zola'. 'NZ growers are primarily interested in seed crops, rather than fibre crops.' [measured NZ trial, verbatim, verified]"
  source_location: "Introduction (p.2, '11 sites … 55 ha' / '19 sites' / 11-cultivar list)"
- claim: "SEED YIELD — the food/oilseed figure (LOAD-BEARING). 'Seed yield for different cultivars under different conditions averaged 95-180 g seed m-2 (=950-1800 kg ha-1) with a maximum of 2800 kg ha-1 (Cutler, 2003; McIntosh, 2003). Seed yield for some cultivars was greater than that reported in the literature.' Abstract restates: 'Hemp cultivated for seed produced maximal yields of 2800 kg ha-1.' Peak seed production by density: 'Kompolti' at 20 plants m-2; 'Anka', 'Fasamo', 'Finola', 'USO 14', 'USO 31' at 90-120 plants m-2. [measured NZ trial, verbatim, verified]"
  source_location: "Harvesting, Yield and Product Use section (p.5, 'averaged 95-180 g seed m-2 (=950-1800 kg ha-1) with a maximum of 2800 kg ha-1'); Abstract (p.1)"
- claim: "FIBRE STALK BIOMASS (dry matter) YIELD. 'Stalk biomass (dry matter) yield for different cultivars under different conditions averaged 600-1100 g m-2 (=6000-11,000 kg ha-1) with a maximum of 13,900 kg ha-1 (Cutler, 2003; McIntosh, 2003). These yields were consistent with reports from the European literature. Most cultivars achieved highest yields of biomass at densities around 120-150 plants m-2.' Abstract: 'fibre crops yielded stalk biomass (dry matter) as high as 13,900 kg ha-1.' [measured NZ trial, verbatim, verified]"
  source_location: "Harvesting, Yield and Product Use section (p.5, 'averaged 600-1100 g m-2 (=6000-11,000 kg ha-1) with a maximum of 13,900 kg ha-1'); Abstract (p.1)"
- claim: "SEED END-USE = OIL (food); PROTEIN QUALITATIVE ONLY, NOT MEASURED. 'The hemp seed had a ready market for its oil. Cold-pressed seed oil was directly bottled and sold as a food product, or manufactured into facial soap. The remaining seed cake was composted or sold to fish farms as fish food. Despite its being high in protein and omega-3 fatty acids, the seed cake and whole hemp seed cannot be processed into human foodstuffs, due to government fiat.' Quantitative seed-quality analysis is named as FUTURE work: 'Seed crops will be evaluated with regard to seed quality (protein and fatty acid profiles).' ⚠ NO measured seed protein % appears anywhere in this report — the only protein reference is the qualitative 'high in protein'. [verbatim; NON-MEASURED for protein — do not extract a protein number]"
  source_location: "Harvesting, Yield and Product Use section (p.5, seed oil / 'high in protein and omega-3 fatty acids'); Conclusions (p.6, 'seed quality (protein and fatty acid profiles)')"
- claim: "ARABLE LAND-CLASS GATE for annual crops incl. hemp. 'Erosion risk, soil fertility, climate, and rainfall are factored into the Land Use Capability (LUC) classification system. Annual crops such as hemp can only be sustained on LUC Class I, II, or III soils. These soils comprise 3.8 M ha, or 14%, of the NZ landsurface (see Figure 1). Most of the 3.8 M ha lies in pasture, only 0.5 M ha is currently cropped (Taylor and Smith, 1997).' Hemp 'fits into this rotation scheme' with grain (barley, wheat, maize, oats) and peas, and can be rotated with fodder and vegetable crops. [authoritative agronomic statement; the 3.8 M ha / 14% figure traces to Figure 1 ('based on arable land mapped by Molloy (1980)', per the Figure 1 caption) — Taylor and Smith 1997 is the citation on the '0.5 M ha currently cropped' clause, NOT on the 3.8 M ha total]"
  source_location: "Soil, Fertilisation and Rotations section (p.3, 'Annual crops such as hemp can only be sustained on LUC Class I, II, or III soils. These soils comprise 3.8 M ha, or 14%'); Figure 1 caption (p.7, 'based on arable land mapped by Molloy (1980)')"
- claim: "GROWING WINDOW + AGRONOMIC INPUTS. Sowing-to-harvest: 'The shortest time from sowing to harvest was 82 days, for an early maturing cultivar growing at a northern site. The longest time was 150 days, for a late maturing cultivar growing at a southern site (Cutler, 2003).' Sowing rates: seed crops 25–50 kg/ha; fibre crops 150-200 seeds m-2. Nitrogen: 'A 10 tonne ha-1 hemp crop extracts 90 kg ha-1 nitrogen … Nevertheless, even a properly retted hemp crop extracts approximately 40 kg ha-1 nitrogen, which must be returned to the soil' — ⚠ this N-uptake figure CITES Hall (2000), it is NOT a NZHIA-trial measurement. Pests/diseases 'appeared rarely and did not require pesticides'; birds were the main seed-crop problem (netting/repellents). [verbatim; N-uptake is cited from Hall 2000, not measured in the NZ trials]"
  source_location: "Sowing (p.4, sowing rates); Soil/Fertilisation/Rotations (p.3, 'A 10 tonne ha-1 hemp crop extracts 90 kg ha-1 nitrogen', citing Hall 2000); Harvesting/Yield (p.5, '82 days … 150 days')"

Neobiome Intelligence relevance

context: both — feeds D02 (Smart Food Systems & Agriculture) and I02 (Food Security & Sustainable Agriculture) as a measured NZ multi-site corroborator on the food/oilseed path. It firms an existing compiled figure and reinforces an existing land-class rule; it does not move a new model cell.

1. Firms the hemp seed-yield figure on the OIL/oilseed path — measured, not compiled. OT_112 lists hemp at 0.8–1.0 t/ha seed as a compiled Table-4 range (drawn from seed companies / FAR / overseas info). This report supplies the measured NZ multi-site trial counterpart: seed averaging 950–1,800 kg/ha with a maximum of 2,800 kg/ha across 11–19 sites and 11 cultivars OT_168. The measured low end (~950 kg/ha) sits right at OT_112’s compiled high end (1,000 kg/ha), and the measured envelope extends well above it — so the measured NZ evidence firms and modestly raises the hemp seed-yield figure rather than contradicting it, and hemp seed is confirmed as a genuine NZ oilseed crop (cold-pressed seed oil bottled as a food product). This is a corroboration of the hemp leg of the OT_112 specialty-crop set on the oil path, the same role OT_088 plays (measured NZ primary) for faba on the protein path.

2. Protein is NOT measured here — hemp stays an OIL crop in the model, not a protein anchor (explicit). This report gives no measured seed protein %. The only protein statement is qualitative — hemp seed is “high in protein and omega-3 fatty acids” — and quantitative protein/fatty-acid profiling is named as future work. Therefore no hemp protein constant is drawn from this source, and it does not disturb the plant-protein anchor, which remains faba (OT_088, ~1,550 kg protein/ha/yr, the conservative LEGUME_PROTEIN_KG_HA). This is consistent with OT_112, which also omits a hemp protein % (it records protein only for chickpea 20% and buckwheat 13–15%). If hemp is ever to enter the model on the food side it belongs on a dietary-fat/oilseed axis — precisely the fat-adequacy dimension flagged as a design note in OT_167 (FNP 91’s ≥15–20%E total-fat floor that the current veg+protein food_ssi axes do not capture) — not on the protein axis. Extracting a hemp protein number would require the separate protein/fatty-acid primary (RT below), not this yield report.

3. Independently restates the LUC 1–3 arable gate. The report states that annual crops including hemp “can only be sustained on LUC Class I, II, or III soils” (3.8 M ha / 14% of NZ) OT_168 — an independent corroboration of the model’s arable cap (AF-41; LUC 1–3 highly-productive pool) already evidenced by CR_052, OT_097, OT_112 and OT_164. A hemp (or any annual grain/oilseed) patch cannot be sited on marginal grazing land in the model — same verdict, another source.

4. Growing-window cross-check. Measured sowing-to-harvest 82–150 days (northern early-maturing → southern late-maturing) cross-checks OT_112’s “~100–110 growing days grain” for hemp and sits comfortably inside the frost-free-period / growing-degree-day gating the model can apply from the NIWA climate layer (RD_022; frost-free-180-day and GDD-800 thresholds per OT_164).

Caveats for the model:

  1. Journal summary of underlying trial reports. The measured yields are reported here from the Cutler (2003) and McIntosh (2003) End-of-Season Reports to the Industrial Hemp Licensing Authority; those per-site raw reports were not independently retrieved. This is a peer-reviewed multi-author write-up, so data_quality: high (measured NZ multi-site trial, verbatim-read, cross-corroborated by OT_112 and the European literature) rather than verified.
  2. 2003 vintage. NZ’s first two seasons under a then-new regulatory regime; agronomy and cultivar sets have moved on. The seed-yield envelope transfers; specific cultivar/density optima are dated.
  3. N-uptake is cited, not measured. The 90 / 40 kg N/ha figures cite Hall (2000), not the NZ trials — use OT_112’s hemp N range (100–130 kg N/ha) as the NZ-context input figure, and treat this only as corroborative order-of-magnitude.
  4. Fibre DM (6,000–13,900 kg/ha) is a biomaterials/biomass figure, not food. It belongs to the hemp-fibre / hempcrete / biomass-energy conversation, not the food_ssi calc; recorded here as measured NZ dry-matter evidence for completeness.

Research targets

Documents to retrieve

  • RT_362 (existing — PARTIALLY advanced, kept OPEN). RT_362 seeks measured NZ crop-specific primaries (yield + protein) for chickpea, soybean, quinoa and hemp to firm OT_112’s compiled Table-4 ranges. This source delivers the HEMP seed-yield leg (measured NZ multi-site trial). It does not resolve RT_362: it firms hemp yield only (not protein), and the chickpea, soybean and quinoa legs remain outstanding. No new RT is opened — the remaining work stays under RT_362, and the NZ soybean/quinoa protein-% gap stays under RT_363.

Research gaps

  • (Noted, not raised) A hemp seed protein / fatty-acid NZ primary — this report explicitly defers that analysis to “future” work, and OT_112 also omits a hemp protein %. Not raised as a new RT (it is a natural extension of RT_362’s hemp leg and of RT_363’s protein-% gap, so it is folded here rather than opened separately). Only needed if hemp is ever promoted from an oilseed flag to a modelled oil/fat cell.

Notes

  • Authoritative peer-reviewed industry/academic report, downloaded directly (not AI-prepared). Read verbatim via pdftotext -layout; every key_claims figure traces to a named section and page. data_quality: high.
  • Publication: McPartland J.M., Cutler S., McIntosh D.J. (2003) “Hemp production in Aotearoa”, Journal of Industrial Hemp “Hemp Production Notes” series (accepted for publication November 2003). Authors: John McPartland (Associate Professor, UNITEC, Auckland), Steve Cutler (Royal Society Teacher Fellow, Lincoln University), Donald McIntosh (Chair, NZ Hemp Industries Association, Wellington). The measured trial figures derive from Cutler (2003) and McIntosh (2003) End-of-Season Reports to the Industrial Hemp Licensing Authority, Ministry of Health.
  • ⚠ Protein is not a measured output of this report (load-bearing). The seed’s food product in NZ is oil, protein is stated only qualitatively (“high in protein and omega-3 fatty acids”), and quantitative protein/fatty-acid profiling is future work. No protein number was extracted.
  • Citation note (claim 5): the 3.8 M ha / 14% highly-productive-land figure traces to Figure 1 (“based on arable land mapped by Molloy (1980)”, per the Figure 1 caption), not to Taylor and Smith 1997 — the (Taylor and Smith, 1997) citation in the source sentence sits on the “only 0.5 M ha is currently cropped” clause. Attribution corrected here (figure unchanged).
  • First measured NZ hemp-trial primary in the corpus. The two existing hemp sources are OT_112 (compiled specialty-crop report) and OT_164 (PFR/MPI plant-protein report); neither reports a measured NZ hemp trial.

Connections

Links to

Sources (7): CR_052 · OT_088 · OT_097 · OT_112 · OT_164 · OT_167 · RD_022

Referenced by

Sources (3): LIT_098 · LIT_122 · OT_112

SSI indicators (1): I02: Food Security & Sustainable Agriculture

EDT domains (1): D02: Smart Food Systems & Agriculture

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