---
title: Harvest Machinery Use methodology
description: Calculate emissions due to fuel combustion from harvesting with machinery.
---

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# Harvest Machinery Use methodology

## Calculate emissions due to fuel combustion from harvesting with machinery.

### Overview

Quantifies emissions due to harvesting events associated with the measured crop. This methodology considers the type of crop being harvested which is then associated with the type of machinery used. This is inclusive of any cover crop in the same measurement period/reporting period as the measured crop. 

### Limitations

This methodology does not include the actual production of the machinery or maintenance.

This activity’s methodology does not include all crops when there is speciality machinery used. Likewise, the emissions factor value generated for this activity for these crops will be *null*. See detailed mapping below. 

Does not include the following harvesting activities. 

- pre harvest swathers or rotary windrower common in small grains or in situational years (e.g. due to weather)
- post harvest drying
- post harvest silage processing
- loading for off farm transport
- trailer use along side a harvester due to limited emissions availability only in the US
- post harvest storage for any period of time

Today there is no distinction given for reduction events and machinery type used, like for hay, silage or root vegetables.

### User Inputs

For each measurement there are inputs required. In the case that the user cannot provide the inputs then Regrow will default them.

  

| **Inputs required** | **Description** | **Unit/Options** |
| --- | --- | --- |
| *Crop* | The name of your measured crop. This should be a single crop per measurement. If a cover crop is included in the cultivation cycle of the measured crop, then it will be included in the emissions attributed to the measured crop. | See our list of supported crops |
| *Harvested yield* | The harvested fresh yield for your measured crop, before any drying or other losses might occur. This is used as the yield denominator. | kg per hectare |
| Location | The area used in the production of your measured crop. This should be a single field or single managed unit. Location is used to inform the emissions factors used. In most cases this is a global value for the crop and some select crops x geography this is country-specific. | Country-level or field level |
| Cover crop | If there was a cover crop harvest/termination within the cultivation cycle of the measured crop. If yes, then a cover crop harvest event is included in the emissions assigned to the measured crop. | See our list of supported crops |

 

Assumptions for on-field harvest activities

- Assumes 1 harvest event per crop, including cover crops. 
  
    - *For example, if wheat is planted/harvested and a cover crop is planted/terminated during the reporting/measured period. Then, there will be two harvest events assumed in this logic: one for the wheat and one for the cover crop.*
- Assumes harvesting ground crop emissions coefficiences for crops like melons, pumpkins, peas, etc (see below), as Ecoinvent does not provide a specific value for these crop's harvest/picking/reaping in their machinery data sets or production activities exchanges.

### Emissions factor coefficients

Ecoinven v3.11 is used for all emissions factor coefficients.

| **Machinery Dataset**  **(Ecoinvent)** | **Coverage** | **Geographies covered** | **Dates** |
| --- | --- | --- | --- |
| Combine harvesting | Combine harvesting, working width 4.5m, grain production and straw treatment not included | Rest of World, Switzerland, Canada – Quebec, Brazil, South Africa, Canada – without Quebec, Australia, United States | 1991-2024 |
| harvesting, by complete harvester, ground crops | Harvesting, by complete harvester, of ground crops. | Rest of World, Switzerland, Canada – Quebec | 1991-2024 |

Mapping harvesting machinery to crops harvested

| **Regrow crop<https://regrow.atlassian.net/wiki/spaces/PROD/pages/3835854888/Tier+1+Crops+supported>** | **Harvest machinery assumed** |
| --- | --- |
| corn | combine harvesting |
| wheat winter | combine harvesting |
| soybean | combine harvesting |
| wheat spring | combine harvesting |
| barley | combine harvesting |
| oat | combine harvesting |
| sorghum | combine harvesting |
| cotton | combine harvesting |
| rye\_spring | combine harvesting |
| *potato* | *null* |
| rice | combine harvesting |
| *peanut* | *null* |
| rice upland | combine harvesting |
| canola | combine harvesting |
| millet | combine harvesting |
| sunflower | combine harvesting |
| dry bean | harvesting, by complete harvester, ground crops |
| corn silage | *null* |
| tomato | combine harvesting |
| safflower | combine harvesting |
| flax | combine harvesting |
| mustard | combine harvesting |
| radish | *null* |
| sweet potato | *null* |
| sorghum silage | *null* |
| rye | combine harvesting |
| pea | harvesting, by complete harvester, ground crops |
| turnip | *null* |
| buckwheat | combine harvesting |
| sunn hemp | combine harvesting |
| lentil | combine harvesting |
| sweet corn | combine harvesting |
| Pop or ornamental corn | combine harvesting |
| watermelon | harvesting, by complete harvester, ground crops |
| teff | combine harvesting |
| pumpkin | harvesting, by complete harvester, ground crops |
| sugar beet | *null* |
| wheat durum | combine harvesting |
| faba bean | combine harvesting |
| hemp | combine harvesting |
| camelina | combine harvesting |
| speltz | combine harvesting |
| rice paddy short | combine harvesting |
| rice paddy long | combine harvesting |

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