farmerbk - 1/18/2026 13:39

Brian
are you referring to this?
(could not get table to load directly, it is in the link)
Applying crop removal rates

An alternative to basing applications only on soil test values is to make crop-removal-based P and K applications. This is best done when soil test levels are within the desired range; applying amounts removed by recent crops is designed to keep soil test levels within this range. Crop removal rates for Illinois were updated a few years ago based on several thousand corn and soybean samples collected over three years (2014-2016). Table 1 shows these nutrient removal amounts per bushel. For instance, a 2-year corn-soybean rotation with 200 bushels of corn and 60 bushels of soybean harvested per acre is estimated to have removed 119 lb. P2O5 and 118 lb. K2O per acre. Replacing these nutrients would take 229 pounds of MAP (11-52-0) or 259 pounds of DAP (18-46-0) per acre, and 197 pounds of potash (0-0-60). An article by Emerson Nafziger in 2017 provides more information on the new numbers.
Table 1. Nutrients removed in harvested grain.
https://farmdoc.illinois.edu/wp-content/uploads/2022/10/Table1_crop-...

bk