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Jonathan Kleinjan

SDSU Extension Crop Production Associate

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 the SDSU Extension Crop Production Associate at the South Dakota State University campus in Brookings.

Also by Jonathan Kleinjan

A field divided into two planting areas. The left area has young corn plants emerging from the soil. The right has no visible corn emergence yet.

2020 Corn Growing Degree Days Update

Spring planting progress of corn in 2020 has been much ahead of a typical year in South Dakota. Crop development, however, seems slow.

aerial view of South Dakota farm and surrounding land

Barley Variety Trial Results

In 2019, Barley trial was planted at one location in South Dakota.

SDSU Extension Winter Wheat Variety trials. One plot is showing more yellowing and stress than other plots.

Low Temperature Effects on Winter Wheat

Low temperatures during the early morning hours of May 9–11, 2020 may have had detrimental effects on winter wheat in some areas of South Dakota. However, cooler spring temperatures that have slowed the winter wheat development this year may have actually been beneficial to S.D. producers, as later-maturing wheat is not as susceptible to injury from freezing temperatures.