Production of 7.5 kg of saffron per hectare in Lorestan is supported by a six-year field experiment, but the number was an irrigated-treatment average rather than a guaranteed result for every farm. The yearly data explain why saffron yield per hectare must always be read with location, field age and growing conditions.

Lorestan agronomist and grower weighing dried saffron from a research plot

What Lorestan’s 7.5 kg per hectare figure represents

Parvin Ramek of the Lorestan Agricultural and Natural Resources Research Center cited research indicating good compatibility for saffron in Kuhdasht, Khorramabad and Biranshahr. The stored report summarised production in farms across those areas as an average of 7.5 kg per hectare.

A published Lorestan experiment provides the essential context behind that headline. The six-year study indexed by FAO’s AGRIS database ran in Khorramabad from 2006 to 2011. Across the full period, irrigated plots averaged 7.5 kg of dry saffron per hectare, while rainfed plots averaged 7.1 kg per hectare. The difference between those two treatments was not statistically significant under the study conditions.

That is stronger evidence than an isolated quotation, but its scope is narrower than the old headline suggests. It describes one controlled experiment in Khorramabad, not a census of every Lorestan farm or a current provincial average.

Yield changed sharply as the field aged

The experiment’s average conceals a wide range between years. Dry saffron yield was only 0.4 kg per hectare in year one. It rose to 5.3 kg in year two, 5.99 kg in year three, 12.8 kg in year four, 12.2 kg in year five and 7.04 kg in year six.

Those results show why a single-season comparison can mislead. A new field and a mature field are not directly comparable, even if both sit in the same county and receive similar care. Corm multiplication and stand development can lift flowering over the early years; congestion, weather, soil conditions and management can then change the result.

The six-year arithmetic average of the listed annual figures is about 7.46 kg per hectare, which is consistent with the rounded 7.5 kg headline. It does not mean that any individual year produced exactly the average.

Rainfed and irrigated results need the study conditions

The research reported no significant yield difference between its irrigated and rainfed treatments over six years. It described the Khorramabad site as receiving about 520 mm of annual rainfall, with an average annual temperature of 17.5°C and an elevation of 1,150 metres.

That finding should not be converted into a general instruction to stop irrigating saffron. Rainfall amount and timing vary by place and season, and a field’s soil changes how long useful moisture remains available. A rainfed result from this experiment cannot be transferred automatically to a drier farm.

The trial also reported final-year corm yields of 23.9 tonnes per hectare under irrigation and 22.9 tonnes under rainfed conditions, again without a statistically significant difference. Corm production and dry stigma production are separate measurements; neither should be substituted for the other.

What is the average saffron yield per hectare in Iran?

The original Lorestan account compared 7.5 kg per hectare with an average saffron yield in Iran of about 5.5 kg per hectare. That comparison belongs to the report’s period and source. It is not a permanent national benchmark.

A separate review indexed by FAO AGRIS reported that Iran’s national yield per unit area had fallen from 5.1 kg per hectare in 1982 to 3.2 kg per hectare in 2015. The point is not to choose one timeless “correct” number. National averages change with the reporting year, harvested area, weather, field-age distribution and data method.

For anyone searching for the average saffron yield in Iran in kg per hectare, the year is part of the answer. A useful statistic should identify whether it measures dry stigmas, which farms were included and whether the area is planted or actually harvested.

How saffron yield per hectare should be calculated

At farm level, the basic calculation is dry, saleable saffron weight divided by the measured harvested area. Both sides of that calculation need discipline.

The numerator should be dried product weighed on a reliable scale, not fresh flowers or unseparated stigmas. The denominator should be the part of the field that was actually harvested, expressed consistently in hectares. Moisture condition, grade and whether the style is included should be recorded so that results can be compared fairly.

A farm record is more useful when it also includes field age, corm source and planting density, irrigation and rainfall, soil observations, labour, drying method and rejected product. Yield alone says how much dry saffron came from the land; it does not establish quality, profit or water productivity.

Why the Lorestan locations showed promise

Ramek’s statement named Kuhdasht, Khorramabad and Biranshahr as the areas with the strongest observed adaptation in the research centre’s work. The six-year Khorramabad experiment supports the case for local suitability, especially because it followed the crop through more than one stage of field life.

Even so, county names are not cultivation instructions. Farms within one county can differ in drainage, soil texture, salinity, slope, frost exposure and available labour. A grower considering saffron needs a site assessment and a modest trial before treating the research average as a production forecast.

The original report’s 7.5 kg figure is best used as evidence that worthwhile yields were possible under studied Lorestan conditions. It is not a promise that every new planting will match the experimental average.

The wider medicinal-plant lesson

The article was not only about saffron. Ramek argued that Lorestan should examine why cultivation of medicinal and aromatic plants had declined, rather than expanding them without understanding past failures.

She referred to large-scale coriander and fennel cultivation in Selseleh and Delfan from the “70s” to the mid-“80s” in the Iranian-calendar wording preserved by the translation. Their area later fell sharply. The report also said research-centre plots had shown promising production for thyme and other species.

This history is relevant to saffron. Mass production and commercialisation can serve the province only when they also support sustainable use of soil, water and natural plant resources. Agronomic suitability is one part of a viable crop; growers also need planting material, skilled seasonal labour, drying and storage capacity, quality control, working capital and buyers. A crop can perform well in a trial and still struggle commercially if the rest of that chain is missing.

How to use the 7.5 kg figure responsibly

Lorestan’s field research gives the headline genuine value. It documents an irrigated six-year average of 7.5 kg per hectare, a similar rainfed average of 7.1 kg, and substantial changes from the first through sixth years.

The safest comparison is between farms with the same yield definition, season, field age and measurement method. Comparing one mature experimental plot with a province-wide average from another year can create a false impression of superiority.

For growers, the practical message is encouraging but measured: parts of Lorestan can support productive saffron, yet the expected yield should come from local multiyear records rather than the headline alone. For researchers and planners, publishing those records clearly is what turns a promising crop into an evidence-based cultivation programme.