About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in AJ

  1. Vol. 70 No. 2, p. 213-216
     
    Received: Apr 20, 1977
    Published: Mar, 1978


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/agronj1978.00021962007000020001x

Nitrogen Fertilization of Soybeans1

  1. R. C. Sorensen and
  2. E. J. Penas2

Abstract

Abstract

Nitrogen fertilization of soybeans (Glycine max (L.) Merr.) has given variable results in increasing soybean yields. The objectives of this study were to determine the extent and magnitude of yield increases of soybeans from N fertilization on soils of the Sharpsburg-Marshall association in Nebraska, and to determine factors to assist in identification of conditions conducive to N induced yield increases. Experimentation with N rates of zero to 224 kg N/ha applied to soybeans was carried out at 13 sites on farmers' fields over a 3-year period. Yield increases were observed at 9 of the 13 sites. Plant N concentration was increased at 7 sites. Increases in yields were not necessarily related to increase in plant N content; but were closely related to increase in seed size. Where effects were observed, seed yield, plant N content, and seed size were generally linearly related to rate of N application. Regression analyses were performed to determine factors which were related to the occurrence of N response. The factors found were soil pH, soil organic matter content, and yield level.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .