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Jonathan Kleinjan

SDSU Extension Agronomist

605-688-4211

Berg Agricultural Hall 225
Agronomy, Horticulture & Plant Science-Box 2207
University Station
Brookings, SD 57007

Jonathan supports the citizens of South Dakota in his role as an SDSU Extension Agronomist at the South Dakota State University campus in Brookings.

State & Regional Offices

SDSU Campus

Also by Jonathan Kleinjan

Spring wheat field with wheat emerging in early spring.

Latest Recommended Planting Dates for Spring Wheat in South Dakota

A major question that producers have been asking is, “How late can wheat be planted in South Dakota without a significant reduction in yield potential?” See our latest recommendations for those considering late planting this May.

Hand holding a dead early-planted soybean seed.

Risks of Early Soybean Planting in South Dakota

Early soybean planting offers potential yield benefits, but it also poses some risks. Learn some expert tips and considerations for early soybean planting this growing season.

Map of South Dakota with dot-plots indicating 24-hour soil temperatures at a 4-inch depth for various locations throughout South Dakota. Data from Mesonet.sdstate.edu

Delayed Planting Due to Soil Temperatures?

Although it can be tempting to get a head start with row crops, it's important to be mindful of soil temperatures and the risks associated with planting early.