v1.4 (2026-08-24) · Kissel, D.E. and Sonon, L.S. (editors). 'Soil Test Handbook for Georgia.' Special Bulletin 62, University of Georgia Cooperative Extension, September 2008; published with full review July 20, 2011 (fieldreport.caes.uga.edu/publications/SB62 — no later edition). Athens, GA: College of Agricultural and Environmental Sciences. RATE AUTHORITY for the per-crop P×K tables: UGA AESL 'Fertilizer Recommendations by Crops' (cropsheets.pdf, Kissel/Harris), https://aesl.ces.uga.edu/publications/soil/cropsheets.pdf — the canonical UGFertex-backed per-crop recommendation document. Companion: UGFertex calculator https://aesl.ces.uga.edu/calculators/ugfertex/. Cotton N rates per Snyder, C.S. & Mitchell, C.C. (2008) 'Soil Fertility and Plant Nutrition Research-Based Soil Testing and Recommendations for Cotton on Coastal Plain Soils,' SERA-6 Southern Cooperative Series Bulletin No. 410. https://aesl.ces.uga.edu/sera6/PUB/sera6-cotton-pub.pdf
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 Georgia — UGA Soil Test Handbook (SB 62) + UGFertex Nutrient Recommendations covers so you can verify the source behind your recommendation.
Browse the full Coverage Explorer — every state, crop and source — or see the science →