Crop Nutrient Removal Formulas

Created by Info Admin, Modified on Thu, 29 Feb at 10:59 AM by Info Admin

Included in this article are various Crop Nutrient Removal Formulas and instructions on how to utilize them within PCT Agcloud.

Instructions to use these formulas

To import and set a formula to run automatically, follow the steps below.

Step 1 (Locate and download formula file):

Select a formula from the list below and download the formula file.

Step 2 (Import formula file):

Navigate to the Add/Edit Formulas tool, click the 'Import formulas from file' button, choose the formula(s) you would like to add, and click 'Import'.

Step 3 (Set formula to auto run):

Select the formula, click 'Edit', change the Auto Type to 'Layers', click 'Save'.

DO NOT USE crop removal formulas from countries other than your own! It is not only the units of measurement that may be different between countries, but also the definition P and K Removal. Some countries calculate P removal based on the mass of elemental P removed, while other countries calculate P Removal based on the mass of P2O5. Similar differences also exist with elemental K and K2O. Using the wrong formula will produce differences in the removal calculations of 44% for P and 82% for K, and these errors will be carried through to nutrient use efficiency and nutrient replacement calculations.

These crop removal formulas are a great starting point to better understand variation in nutrient use and efficiency. However, the formulas assume a uniform nutrient concentration and moisture content of the grain, both of which may vary greatly. Improved accuracy can be achieved using our Protein Pro product.

Downloadable Formulas

Australia

Canada

University of Saskatchewan

USA