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Jason Clark

Assistant Professor & SDSU Extension Soil Fertility Specialist


Berg Agricultural Hall 310
Agronomy, Horticulture & Plant Science-Box 2207A
University Station
Brookings, SD 57007

Soil fertility guidelines for South Dakota cropping systems

State & Regional Offices

SDSU Campus

Also by Jason Clark

an image of the cover of the SDSU Extension Fertilizer Recommendations Guide

SDSU Extension releases updated 2023 corn nitrogen fertilizer rate guidelines

March 27, 2023

South Dakota State University Extension has updated the corn nitrogen Fertilizer Recommendations Guide to reflect lowered rate recommendations.

corn field with sunrise in the background

2019 Survey South Dakota Corn Nutrient Management Practices

Data from the 2019 survey South Dakota farmers was used to examine how local and operational characteristics such as geographic location within SD, tillage practice, and farm size were related to the adoption of various nutrient management practices.

man holding a small pile of soil in his hands

South Dakota Fertilizer Rate Guidelines Calculator for Corn, Soybean, and Wheat

Calculator for Fertilizer Guidelines for Corn, Soybean and Wheat in South Dakota