The Farm Crap App

A new manure management app "the Farm Crap App" is designed to help farmers and growers value the nutrients found in organic manures.

What is it?

The app, developed by the SWARM Knowledge Hub in collaboration with Rothamsted Research North Wyke allows the farming community to appreciate the nutritive and economic value of livestock manures.

Farmers are able to visually assess manures and slurry application rates and calculate what is being provided in terms of available nutrients as well as giving an estimate of potential savings in artificial fertilisers.

The data is based on Defra's RB209 Fertiliser Manual values for crop available nutrients along with the industry produced publication Think Manures and allows you to select different seasons, types of manures and crops growing to see what the manure will provide in terms of fertiliser value.


Exciting new developments!

The team behind the Farm Crap App have been busy working at incorporating all the feedback that we received from the industry.  We are proud to be launching the new Farm Crap App Pro at Grassland and Muck next week. 


What's new?

There are lots of new features on the app which make it easier to use and get the financial and environmental benefits that come from efficiently using manures and slurry. 

New features include:

  • the ability to map all the fields on your farm
  • individual crop nutrient recommendations from RB209, to allow you to complete field nutrient plans
  • the ability to take into account applications of compost, digestate and other products, including your own data from slurry or manure analysis
  • the ability to take into account the application method (dribble bar, trailing shoe, injection) and account for the increased nutrient availability that comes with these bits of kit
  • the ability to include applications of bagged fertiliser.

Where do I get it?

Best of all, the app is still free to use and download, and available on both Apple and Android devices. We have also developed a web version of the calculator, which is available here

Click on the links below which will take you to the right place on the Google Play and Apple App store.

           Apple App store image here (no link yet)


What does it do?

The Calculator

The calculator determines the amount of crop available nutrients that are found within manures spread at different rates. This helps with decisions on how much to spread in order to meet the crop requirements. You can take into account the impact of spreading with different slurry or manure spreaders or see the difference that you can make by applying in the spring or the winter.

The image library

This can be used as a visual reference guide to estimate the spreading rate of manure applied to the field and calculate the amount of crop available nutrients that have been applied.

Record sheets

The app will allow you to map all the fields on your farm, then enter records into each field every time you go and spread (either manure, slurry, compost or bagged fertiliser).  The app will keep records in terms of crop nutrient requirements, what each application is providing and how much extra you need.

How do I access it?

The app is available on Apple and Android devices, through the Google Play or iTunes stores. Click on the relevant picture below to go to the home page for the app.




User guides

The Hub team has produced two user guides (one for Android and one for Apple devices) to guide you through the process of downloading and using the app.  Click on the links below to dowload the guide applicable to your device.

The FarmCrapApp User Guide for Android

The FarmCrapApp User Guide for Apple

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