Document Type

Thesis - University Access Only

Award Date


Degree Name

Master of Science (MS)

Department / School

Plant Science

First Advisor

Howard J. Woodard


Soybean production in South Dakota has been steadily increasing over the years as better management factors are implemented to increase grain yield. Many I management methods are available to the soybean producer in South Dakota that can have a great impact on early soybean Phosphorus (P) nutrition and final grain yield. The purpose of this study was to determine how the management effects of tillage, row width, P fertilization, and maturity selection influence soybean early growth, shoot P uptake, and final grain yield. This study was conducted at the SDSU southeast Research Farm in Clay Co., South Dakota. Treatments were applied to the experimental site in a progression of spit-blocks during the 1997 and 1998 growing seasons. The individual main effects best described the parameter responses of this study because no significant interactions were found. Tillage did not significantly influence any of the parameters of this study. Phosphorus fertilization increased early growth P uptake but significantly increased final grain yield only in 1998. The narrow row widths (7" and 14") increased early growth shoot P uptake and final grain yield (7%) due to less intra-row competition compared to the wide row width (28"). The early growth P uptake and grain yield (6%) of Maturity Group II varieties were greater due to their better adaptability to the southeast South Dakota climate compared to the Maturity Group I varieties.

Library of Congress Subject Headings

Soybean -- South Dakota.
Phosphorus in agriculture -- South Dakota.
Phosphatic fertilizers -- South Dakota.
Soybean -- Yields -- South Dakota.


South Dakota State University



Rights Statement

In Copyright