Lieu-dit · Saint-Gengoux-le-National
Les Maizerolles
Les Maizerolles is a lieu-dit in Saint-Gengoux-le-National, Mâconnais, Burgundy, whose largest tier is regional.
20.1 ha
delimited
279 m
elevation
11.4 h
sun at harvest
Open on the mapWith the boundary, the plots, the sun through the year and the bedrock.
In figures
| Level | Regionalinao-aoc-viticoles-bulk (c. 4 September 2026) |
|---|---|
| Village | Saint-Gengoux-le-National |
| Region | Mâconnais, Burgundy |
| Delimited | 20.1 hainao-aoc-viticoles-bulk (c. 4 September 2026) · cadastre-etalab (4 September 2026) |
| Planted | 0.72 hacadastre-etalab (4 September 2026) · ign-bdtopo-vigne (5 September 2026) · ign-rpg-2024 (5 September 2026) |
| Parcels | 46 |
| Grape variety | gamay / chardonnay also permitted: pinot noir, gamay de bouze, gamay de chaudenay, aligoté, pinot blanc, pinot gris, melon, sacyinao-cahiers-des-charges (7 September 2026) · dgddi-superficies-produits (7 September 2026) · franceagrimer-observatoire-viticulture (7 September 2026) |
| Organic | 0%agence-bio-cartobio (c. 5 September 2026) · agence-bio-operateurs (5 September 2026) |
Place in the village
Among the 18 named plots ranked regional in Saint-Gengoux-le-National, from high to low:
Position
279 m
elevation
8.8%
firm
NE
northeast
mid-slope
even slope
| Elevation | 279 m 256 to 306 mign-rge-alti (5 September 2026) |
|---|---|
| Daytime temperature | +0.06 °C by day, relative to the village centre at 287 m, ± 0.02 °Cmeteo-france-quotidiennes (18 September 2026) · meteo-france-postes (6 September 2026) · meteo-france-lsh (6 September 2026) · ign-rge-alti (5 September 2026) |
| Slope | 8.8% 5.0°ign-rge-alti (5 September 2026) |
| Aspect | northeast 52°ign-rge-alti (5 September 2026) |
| On the slope | 37% mid slope, on an even plane, 181 m drains onto itign-rge-alti (5 September 2026) |
Bedrock
- 79%Eocene sands and clays with flint about 56–34 million years
- 14%Lithographic limestone, Lower Kimmeridgian 155–152 million years
- 4%Nantoux limestone and Mercurey marl 157–155 million years
- 3%Greenish Triassic sandstone and dolomite about 252–237 million years
Not a borehole: ordered by age, thickness by share of surface.
In the glass. Says little in itself. Where the cover is thick, a broad, soft style is reported more often than the tension of the marl slopes, but the outcome is determined by thickness, position and what lies beneath. (weak indication)
Not a marine deposit but a continental cover: sand and clay left behind in the Eocene, roughly 56 to 34 million years ago, under a warm climate on the plateaux that had already emerged by then. The flints in it come from older calcareous rocks that have dissolved. The ground is orange to red-brown, heavy clay with a sandier top layer and loose flints, and is decalcified.
For the vine. Because the lime has been leached out, active lime is virtually absent and chlorosis rarely an issue. The clay retains a great deal of water but drains slowly, so the plot is cold in spring and buds late; sand and flint at the surface ease that. Everything depends on the thickness of the cover: thin means the roots reach the limestone beneath, thick means a completely different, acidic environment.
Mainly on the plateaux of the Yonne, above the slopes of the Auxerrois and the Tonnerrois.
BRGM geological map at 1:50,000. It tells vineyards apart, not plots within a vineyard. The link between rock and taste is indirect: soil depth, water and warmth do the work, and slope, vine age and the cellar do the rest. Units on that map: eS, j6b, j5c, tG.
brgm-bdcharm50 (4 September 2026)Sun and horizon
07:31
above the hill
18:57
behind the hill
11.4 h
sun at harvest
Grey: sun up, behind the hill or its own slope.
Around harvest the sun rises here at 07:31 above the hill and disappears at 18:57 behind the hill: 11.4 hours of direct sun on a clear day. The ridge reaches 8.6° above the horizon to the west-northwest.
| Irradiation | −2.1% versus flat land 1,034 kWh/m² from April to October, 43% of it diffuseunder the average cloudiness of 2005 to 2023 (PVGIS-SARAH3, EU JRC); direct, diffuse and reflected light togetherign-rge-alti (5 September 2026) · ign-lidarhd-mnh (6 September 2026) · ign-bdforet-v2 (5 September 2026) · jrc-pvgis-sarah3 (10 September 2026) |
|---|---|
| Open sky | 99.3% of the sky the slope itself sees; the surrounding relief blocks the restign-rge-alti (5 September 2026) · ign-lidarhd-mnh (6 September 2026) · ign-bdforet-v2 (5 September 2026) |
Three reference days, the caveat
| rise | set | sun | day | |
|---|---|---|---|---|
| 21 June | 06:09 | 20:40 | 14.5 h | 15.8 h |
| 20 September | 07:31 | 18:57 | 11.4 h | 12.3 h |
| 21 December | 09:04 | 16:08 | 7.1 h | 8.6 h |
Computed from the IGN elevation model at 5 m: horizon in 36 directions up to six kilometres, sun position per minute, angle of incidence on the mean slope. Clear sky, with the tree canopy from the IGN forest inventory as a raised horizon (15 m closed forest, 5 m heath, trees within 60 m ignored), 29% of the far field is forest (BD Forêt), no buildings.
Air and cold
23 m
above the lowest point
drains away
cold air
a gully
5.2 ha flows past
| Cold air | 23 m above the hollow, cold air drains awayign-rge-alti (5 September 2026) |
|---|---|
| Cold air passing through | 5.2 ha a gully, mean over the polygon 0.23 haign-rge-alti (5 September 2026) |
Planting
N-S
diagonal to the slope
1.00 m
between the rows
92%
vineyard in 1950
| Rows | N-S (5°) diagonal to the slope (47°), every 1.00 m, all rows parallelmeasured over 0.7 of 0.7 ha plantedign-bdortho (6 September 2026) |
|---|---|
| Vineyard in 1950 | 92% abandoned since: 9.40 haassessed over 11.1 ha on the 1950-1965 aerial photographign-photos-historiques-1950-1965 (6 September 2026) |
Climate over time
station MT-ST-VINCENT, 601 m, 14.4 km away
growing season, April to October: 1951-1980: 13.5 °C, 1991-2020: 15.1 °C
Huglin index: 1951-1980: 1,248, 1991-2020: 1,553
last spring frost: 1951-1980: day 107, 1991-2020: day 101
series homogenised through 2022
Who owns land here
2.87 ha of 20.1 ha delimited is registered to a legal entity
- GAEC POULACHON14%
- LA ROCHETTE1%
- private individuals or unknown86%
- 2.74 ha GAEC POULACHON GAEC · wine business
- 0.13 ha LA ROCHETTE SCI · land company
Private individuals or unknown: 17.3 ha.
Share of the delimited hectares. Only legal entities are public in France; everything else stays unnamed. From the public register of legal entities (DGFiP), as of 1 January 2025. The owner is not always the one who works the vineyard: tenancy is common.
Nearby lieux-dits
- Saint-Roch Regional · 550 m
- La Tanière Regional · 750 m
- Le Champ Pain Regional · 900 m
In the same village, measured between label points. That does not say which ones border each other; the map shows that.
Where each figure comes from
- Classification
- The INAO delimitation per denomination, cut against the cadastral parcel. Only the INAO's own plans are legally binding; this map is informational.
- Area
- Computed on the sphere from longitude and latitude (turf.area), not in Lambert-93. For an appellation this is the union of the INAO polygons across commune boundaries, measured on the unclosed geometry; the fifteen metres used to close the outline for the map are not counted. For a climat it is the union of the cadastral lieu-dit polygons with that name.
- Planted
- Parcel area times vineyard cover, where cover comes from the IGN vegetation layer supplemented by the agricultural declaration. Checked against the customs harvest declarations: median deviation 5.1 per cent over a hundred appellations.
- Elevation
- Mean of the elevation-model cells whose centre falls inside the polygon, on a 5 m grid.
- Slope
- Per-cell slope from the elevation model using Horn's method, then averaged over the cells in the polygon.
- Aspect
- Vector mean of the per-cell aspect. A plain average would turn north-east and north-west into south.
- Sun at harvest
- Hours of direct sun on 20 September under a clear sky, with the horizon in 36 directions out to six kilometres and the height of woods and buildings on top of it. Canopy height is measured where LiDAR HD covers the area and estimated from BD Forêt where it does not; the panel states which of the two was used.
- Grape variety by appellation
- Per appellation and colour the permitted varieties from the approved cahier des charges; per appellation and tier the declared hectares of white and red from the customs harvest declaration (product codes). One colour permitted: the main variety of that colour. Two colours: from 85 percent of the hectares that colour applies, in between it is called mixed. Champagne: the dominant variety from the planted hectares per variety per commune from FranceAgriMer. Per polygon the dominant variety of its parts by area. Derived, not measured: the variety per plot exists only in the customs vineyard register, which is not public. In a two-colour appellation a single plot may carry the other variety. Customs withhold small appellations (statistical secrecy), in which case the split is missing.
- Bedrock
- The geological unit covering the largest share of the polygon, from the 1:50,000 geological map. At 1:50,000 the map separates one climat from another, but not what varies inside a climat.
- Organic
- Share of the area certified organic or in conversion, from the CartoBio plot register.