Jason Clark

Assistant Professor & SDSU Extension Soil Fertility Specialist

Jason Clark
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605-688-4395

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

Producer holding soil in cupped hands over a bare field in early spring.

80 South Dakota farmers needed for nationwide soil health project: Enroll today

April 03, 2025

South Dakota State University Extension is inviting South Dakota farmers to participate in a new soil health survey.

Tractor planter seeding crops in a no-till field.

Fertilizer Placed With the Seeds in Dry Soil Conditions

Climate patterns can shift from wet to dry very quickly. A current consideration is thinking about seed injury from furrow-placed fertilizers, and there are notable differences among crops for tolerance of seed-placed fertilizers.

Tanks of anhydrous ammonia being pulled to a field for fertilizer application.

Starter Fertilizer Calculator and Final Report

Decision aid to assist crop planners in selecting the maximum safe fertilizer rate that can be applied with the seed for various crops.

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