Open Access. Powered by Scholars. Published by Universities.®
- Institution
- Publication
Articles 1 - 2 of 2
Full-Text Articles in Agronomy and Crop Sciences
Sulfur Emerges As A Nutritional Issue In Iowa Alfalfa Production, John E. Sawyer, Brian J. Lang, Daniel W. Barker
Sulfur Emerges As A Nutritional Issue In Iowa Alfalfa Production, John E. Sawyer, Brian J. Lang, Daniel W. Barker
John E. Sawyer
Sulfur is often classified as a “secondary” essential element, mainly due to a smaller plant requirement, but also because it is less frequently applied as a fertilizer compared to N, P, and K. This has certainly been the case in Iowa, where research had not documented S deficiency or fertilization need for optimal crop production. However, if deficient, S can have a dramatic effect on plant growth and crop productivity – more than the classification “secondary” would imply.
Measured And Predicted Temporal Changes In Soil Nitrate-N Levels From Late Summer To Early Spring In Montana, Andrew W. Lenssen, Clain Jones, Chengci Chen, Kent Mcvay, Bob Stougaard, Mal Westcott, Joyce Eckhoff, Jennifer Weeding, Mark Greenwood
Measured And Predicted Temporal Changes In Soil Nitrate-N Levels From Late Summer To Early Spring In Montana, Andrew W. Lenssen, Clain Jones, Chengci Chen, Kent Mcvay, Bob Stougaard, Mal Westcott, Joyce Eckhoff, Jennifer Weeding, Mark Greenwood
Andrew W. Lenssen
Most soil sampling is conducted from August to November in Montana because of better soil sampling conditions and because it provides more time for growers to make fertilizer decisions prior to application. Fertilizer guidelines in Montana are based on spring nitrate-N levels in the upper 2 ft because they are more indicative of growing season available N than fall nitrate-N levels. It is not known how much nitrate-N levels change between late summer and spring, nor is it known what factors affect these changes, and large changes could result in either over-application of N fertilizer or sub-optimal yields. A three-year …