--- title: Key concepts for Inventory API module description: Important terms to understand --- [Skip to content](https://help.regrow.ag/key-concepts-1#main-content) English Show submenu for translations [Customer portal](https://help.regrow.ag/support?hsLang=en) ![Regrow\_logo-1.png\]](https://help.regrow.ag/hs-fs/hubfs/03.%20Logos/Regrow_logo-1.png?height=40&name=Regrow_logo-1.png) Open main navigation Close main navigation - English Show submenu for translations - [Customer portal](https://help.regrow.ag/support) - [Go to regrow.ag](https://www.regrow.ag/) [Go to regrow.ag](https://www.regrow.ag/) How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge Base](https://help.regrow.ag/?hsLang=en) 2. [Measure API: Inventory](https://help.regrow.ag/measure-api-inventory?hsLang=en) 3. [Getting started](https://help.regrow.ag/measure-api-inventory?hsLang=en#getting-started) # Key concepts for Inventory API module ## Important terms to understand ### Terms - **Field history**: The field conditions and management events that occurred on a field *before* the reporting period. Importantly this is not a distinct term used in the Inventory API but it is important to be aware of due to it's use by DNDC. - **Cultivation Cycle:** A distinct grouping of field management events that correspond to a cultivation cycle. Typically, this is harvest of a commodity crop to the harvest of the following commodity. Cultivation cycles are inclusive of tillage, planting, irrigation, nutrient management and harvest practices, as well as other adopted interventions such as a cover crop in the off season. - **Simulation:** A simulation is the process of modeling emissions outcomes on a field using the DNDC model. - **Reporting information:** Time period for which emissions should be quantified. ### Construction of Cultivation Cycles Each field should be composed of cultivation cycles with a discrete start and end date. Cultivation cycle start and end dates should be continuous with no gaps.  Typically, cultivation cycles start the day after the harvest of a commodity crop and end the day of the harvest of the following commodity. Cultivation cycles are inclusive of all the management events that occurred on that field during that cultivation cycle. This includes tillage, planting, irrigation, nutrient management and harvest. DNDC requires a minimum of four cultivation cycles: 3 historic and 1 reporting. The reporting period is the cultivation cycle in which the emissions is being quantified. Usually your reporting period is the most recent cultivate cycle. There can only be one measured crop declared in the reporting period. Usually this is your commodity crops for which you are interested in allocating emissions.  ![](https://help.regrow.ag/hs-fs/hubfs/image-png-Aug-28-2025-01-07-05-5349-PM.png?width=688&height=187&name=image-png-Aug-28-2025-01-07-05-5349-PM.png) - [Sustainability Insights](https://help.regrow.ag/sustainability-insights?hsLang=en#main-content) - [General](https://help.regrow.ag/sustainability-insights?hsLang=en#general) - [Configure](https://help.regrow.ag/sustainability-insights?hsLang=en#configure) - [Report](https://help.regrow.ag/sustainability-insights?hsLang=en#report) - [Plan](https://help.regrow.ag/sustainability-insights?hsLang=en#plan) - [Data updates](https://help.regrow.ag/sustainability-insights?hsLang=en#data-updates) - [Models](https://help.regrow.ag/sustainability-insights?hsLang=en#models) - [Integrations](https://help.regrow.ag/sustainability-insights?hsLang=en#integrations) - [SAI Outcomes](https://help.regrow.ag/sustainability-insights?hsLang=en#sai-outcomes) - [MRV](https://help.regrow.ag/mrv?hsLang=en#main-content) - [Login and registration](https://help.regrow.ag/mrv?hsLang=en#login-and-registration) - [Field boundaries](https://help.regrow.ag/mrv?hsLang=en#field-boundaries) - [Data entry tips and guidelines](https://help.regrow.ag/mrv?hsLang=en#data-entry-tips-and-guidelines) - [Data entry accelerators](https://help.regrow.ag/mrv?hsLang=en#data-entry-accelerators) - [Soil sampling](https://help.regrow.ag/mrv?hsLang=en#soil-sampling) - [Program data review](https://help.regrow.ag/mrv?hsLang=en#program-data-review) - [Reporting](https://help.regrow.ag/mrv?hsLang=en#reporting) - [Research and data credits](https://help.regrow.ag/research-and-data-credits?hsLang=en) - [Measure API: Enteric](https://help.regrow.ag/measure-api-enteric?hsLang=en#main-content) - [Getting started](https://help.regrow.ag/measure-api-enteric?hsLang=en#getting-started) - [Measure API: Intervention](https://help.regrow.ag/measure-api-intervention?hsLang=en#main-content) - [Introduction](https://help.regrow.ag/measure-api-intervention?hsLang=en#introduction) - [Getting started](https://help.regrow.ag/measure-api-intervention?hsLang=en#getting-started) - [Common Questions](https://help.regrow.ag/measure-api-intervention?hsLang=en#common-questions) - [Outcomes](https://help.regrow.ag/measure-api-intervention?hsLang=en#outcomes) - [Product Releases](https://help.regrow.ag/measure-api-intervention?hsLang=en#product-releases) - [Measure API: Inventory](https://help.regrow.ag/measure-api-inventory?hsLang=en#main-content) - [Introduction](https://help.regrow.ag/measure-api-inventory?hsLang=en#introduction) - [Getting started](https://help.regrow.ag/measure-api-inventory?hsLang=en#getting-started) - [Outcomes](https://help.regrow.ag/measure-api-inventory?hsLang=en#outcomes) - [Monitor API](https://help.regrow.ag/monitor-api?hsLang=en#main-content) - [Getting started](https://help.regrow.ag/monitor-api?hsLang=en#getting-started) - [Remote sensing technology](https://help.regrow.ag/monitor-api?hsLang=en#remote-sensing-technology) - [Integrate with Monitor API](https://help.regrow.ag/monitor-api?hsLang=en#integrate-with-monitor-api) - [Understanding Monitor field data](https://help.regrow.ag/monitor-api?hsLang=en#understanding-monitor-field-data) - [Cradle to farm-gate emission factors](https://help.regrow.ag/cradle-to-farm-gate-emission-factors?hsLang=en#main-content) - [Getting started](https://help.regrow.ag/cradle-to-farm-gate-emission-factors?hsLang=en#getting-started) - [Methodology](https://help.regrow.ag/cradle-to-farm-gate-emission-factors?hsLang=en#methodology) - [On-field activity data sources](https://help.regrow.ag/cradle-to-farm-gate-emission-factors?hsLang=en#on-field-activity-data-sources) [![Chill listening crop-3](https://help.regrow.ag/hs-fs/hubfs/03.%20Logos/Regrow_logo.png?width=96&height=24&name=Regrow_logo.png "Chill listening crop-3")](https://www.regrow.ag/) Copyright © 2026, Regrow Agriculture Inc.