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Document Type

Thesis - University Access Only

Award Date


Degree Name

Master of Science (MS)

Department / School

Mathematics and Statistics

First Advisor

Jixiang Wu


Phosphorus (P) deficiency in the soil is known to limit the production of leguminous crops. Soybean crop needs large amount of P during the process of atmospheric nitrogen fixations. Soybeans crop plant production is heavily affected when the soil is low in P. Soybean grain yield could be increased when P is returned to the soil. A field experiment was conducted across Eastern South Dakota in 2013 and 2014 to study the response of soybean yield and yield components to phosphorus fertilizer applications. The experiment was laid out in a randomized complete block (RCB) design with four replications for each location. The treatments consisted of five P levels 0, 22, 45, 67, and 90kg/ha as triple superphosphate. Data for yield and yield components were collect and analyzed with analysis of variance for each location. In 2013, P effect had no significant impact on yield at any location except Wessington Springs (Groths). Whole pod weight was influenced by P fertilizer application in Geddes. In 2014, significant P effects were detected for grain yield, whole pod weight, and whole bag weight at Wessington 2 (Fritzes), plant height at Nunda, and whole bag weight and whole pod weight at the South East Research Farm.

Library of Congress Subject Headings

Soybean -- Yields -- South Dakota
Soybean -- Varieties -- Field experiments -- South Dakota
Soybean -- Fertilizers -- South Dakota.;
Phosphorus in agriculture -- South Dakota
Phosphatic fertilizers


Includes bibliographical references (pages 106-107)



Number of Pages



South Dakota State University



Rights Statement

In Copyright