v1.2 (2026-06-10) · Rutgers NJAES Cooperative Extension. PRIMARY: FS719 'Soil Fertility Test Interpretation — Phosphorus, Potassium, Magnesium, and Calcium' (Joseph R. Heckman, Oct 13, 2006). SUPPORTING: E364 'Soil Fertility Recommendations for Pastures' (Heckman). FS1295 'Soil Fertility Recommendations for Producing Grass Hay' (Heckman, July 2018). FS1188 'Soil Fertility Recommendations for Small Grains' (Heckman). E321 'Soil Fertility Recommendations for Alfalfa' (Heckman). E365 'Sulfur Nutrition and Soil Fertility Management for New Jersey Crops' (Heckman). FS903 'Liming New Jersey Soils for Field and Forage Crops'. FS973 'Manganese Needs of Soil and Crops in New Jersey'.
State extension method. Zone Forge computes this source's supported nutrient rates in-app and cites the published method.
Yes — Zone Forge's calculators are free and need no signup. This page shows the states and crops New Jersey — Rutgers Cooperative Extension / NJAES covers so you can verify the source behind your recommendation.
Browse the full Coverage Explorer — every state, crop and source — or see the science →