# MRTN Rate Calculator

> Calculates optimal nitrogen fertilizer rates for crops using agronomic and economic data. (iPhone/iPad app by University of Illinois at Urbana-Champaign.)

- Source: https://appshunter.io/ios/app/mrtn-rate-calculator/id560788301 (this page in markdown: same URL + `.md`)
- Developer: [University of Illinois at Urbana-Champaign](https://appshunter.io/developer/422670617)
- Category: Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 10.0 · 57 MB
- Languages: American English
- Released: 2012-09-18
- Data updated: 2026-07-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/mrtn-rate-calculator/id560788301/reviews.md

## What is MRTN Rate Calculator?

The Maximum Return To Nitrogen (MRTN) calculations combine the agronomics of nitrogen rate research and the realities of economic fluctuations to provide a customized nitrogen rate.

## Key features

- Customized nitrogen rate recommendations
- Combines agronomic research
- Considers economic fluctuations
- Maximizes return on investment


## Frequently asked questions about MRTN Rate Calculator

### What is the MRTN Rate Calculator?

The MRTN Rate Calculator is a utility app that determines the most effective nitrogen fertilizer rate for crops. It uses a combination of agronomic research and current economic data to provide a personalized recommendation.

### How does MRTN Rate Calculator calculate nitrogen rates?

It integrates findings from nitrogen rate research with real-time economic factors, such as fertilizer prices and crop market values, to suggest an optimal rate that balances agronomic needs with economic viability.

### Is MRTN Rate Calculator free to use?

Yes, the MRTN Rate Calculator is available for free. It does not require any payment to download or use its core functionalities.

### What devices support MRTN Rate Calculator?

MRTN Rate Calculator is available on iPhone, iPad, and iPod devices. It is designed for iOS users.

### How often is MRTN Rate Calculator updated?

The app was last updated on April 11, 2024, with version 2.4. The developer, University of Illinois at Urbana-Champaign, provides updates to maintain its functionality and accuracy.

### What is the age rating for MRTN Rate Calculator?

MRTN Rate Calculator has an age rating of 4+, making it suitable for a wide range of users, including younger individuals interested in agricultural applications.

### Does MRTN Rate Calculator have ads?

No, MRTN Rate Calculator does not contain advertisements. As a free utility, it provides an ad-free experience for its users.

### What is the user feedback on MRTN Rate Calculator?

The app has received a perfect rating of 5.0 stars from one review, indicating a highly positive user experience based on available data.

## Version history (last 5 releases)

### 2.4 — 2024-04-11

Added user instructions for performing calculations.

### 2.2 Ready for Sale — 2019-04-10

Updated formulas that calculate the recommended nitrogen rate with 2018 research plot data to match web version.

### 2.1 — 2018-11-02

- Calculation updates

### 2.0 — 2018-10-18

- Updated to support new iOS versions
- Stability improvements
- Improved interface usability
- Updated calculation logic and functionality

### 1.2 — 2013-01-18

Fixes calculation error

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All apps by University of Illinois at Urbana-Champaign: https://appshunter.io/developer/422670617

## Related topics

[nitrate](https://appshunter.io/ios/topics/nitrate)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-04.*