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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

Oat leaves covered in orange pustules.

Crown Rust of Oats

Crown rust continues to be the most economically damaging and important fungal diseases of oats in South Dakota. Learn how to recognize and manage it in oat fields this growing season.

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.