Nutrient Management Recommendations – Agronomic Crops// here is the normal content // ?>
Amy L. Shober, Richard W. Taylor (ret.), Karen L. Gartley, and J. Thomas Sims (ret.)
Department of Plant and Soil Sciences
University of Delaware Cooperative Extension
|Small Grains, Soybeans, Double-cropped|
|Soybeans, Full season|
Converting from Soil Test Value (ppm) to Fertility Index Value (UD-FIV)
Soil test interpretive categories used by the University of Delaware
|Soil Test Category||Fertility Index Value (FIV)||Phosphorus (P)||Potassium (K)||Magnesium (Mg)||Calcium (Ca)|
|Soil Test Value (ppm)||Soil Test Value (ppm)||Soil Test Value (ppm)||Soil Test Value (ppm)|
|Low||0 - 25||0 - 25||0 - 70||0 - 55||0 - 450|
|Medium||26 - 50||26 - 50||71 - 140||56 - 110||451 - 900|
|Optimum||51 - 100||51 - 100||141 - 280||111 - 220||901 - 1800|
|Excessive||> 100||> 100||> 280||> 220||> 1800|
Calculating the Lime Recommendation
To determine the lime requirement for a field, follow these steps:
Select the appropriate lime table from the list below based upon the target pH of the crop as listed in the recommendation section. Locate the value in the table where the Water pH row (shown along the left side of table) and the Buffer pH column (shown across the top of the table) intersect (see example).
Determine whether a lime credit is necessary. Lime credits are used to account for any lime that was applied in the past 18 months which has not had a chance to react. The equation for calculating the lime credit and an example can be obtained by clicking here.
Determine the the type of lime recommended (e.g., calcitic or dolimitic) by clicking here.
University of Delaware Lime Tables
These tables are designed to be used with the Adams-Evans buffer pH. If the lime requirement test was performed by laboratory using a different buffer method, contact the laboratory for the appropriate lime tables.
Target pH 5.2 -- Blueberries; non-scab resistant potatoes
Target pH 5.6 -- Acid loving plants; black high organic matter soils
Target pH 6.0 -- Most Delaware crops
Target pH 6.2 -- Many commercial vegetable crops
Target pH 6.5 -- High Calcium demand crops, golf course turf,
Target pH 6.8 -- Alfalfa
All Lime Tables -- This .pdf file contains copies of all six lime tables for commercial crops.
Commercial Agriculture Soil Test Notes
UD SOIL TESTING PROGRAM - NUTRIENT RECOMMENDATIONS
|Commercial Production:||Agronomic Crops|
|Forage and Hay Crops|
Original Publication Date: January 2017
Cooperative Extension Education in Agriculture and Home Economics, University of Delaware, Delaware State University and the United States Department of Agriculture cooperating. Distributed in furtherance of Acts of Congress of May 8 and June 30, 1914. It is the policy of the Delaware Cooperative Extension System that no person shall be subjected to discrimination on the grounds of race, color, sex, disability, age, or national origin.
Disclaimer: Reference to commercial products or trade names does not imply endorsement by University of Delaware Cooperative Extension or bias against those not mentioned.