The P & K calculator is an online calculator for estimating P and K fertilizer requirements for grassland and crops from the Fertilizer Association of Ireland.
This P and K calculator tool provides general guidelines for crop offtake and/or general agronomic advice for P and K application to grassland and arable crops in Ireland.
It is available online, or via the iOS and Android Smart Phone Apps.
**Please note that some users have had issues with installing the Android App, contact the Fertilizer Association if this is the case: firstname.lastname@example.org**
It requires details of crop yield, grassland stocking rate, concentrate feed usage, soil test results, and slurry application to estimate chemical fertilizer P and K requirements.
All calculations are consistent with Best Practice Recommendations from Teagasc.
The guidelines included for crop requirement and organic fertilizer value may result in recommendations that exceed the maximum N and P allowances on the farm.
Fertilizer usage must be in compliance with Nitrates Regulations and other nutrient management legislation. This may constrain the rates of N and P fertilizer that are permissible relative to the guidelines shown by this tool.