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Production of Sugar Beets Following Winter Green Manure Cropping in California: I. Nitrogen Nutrition, Yield, Disease, and Pest Status of Sugar Beets¹

ABSTRACT

Leguminous and nonleguminous winter green manure crops were grown in two field experiments and followed by sugar beets as a test crop. The latter were fertilized with several levels of nitrogen. The legume, purple vetch, made approximately 80 pounds of nitrogen per acre available to the succeeding crop as indicated by the response in sugar production and beet petiole analysis for nitratenitrogen. The nonlegume, barley, depressed sugar production from unfertilized sugar beets by making some soil nitrogen unavailable. The trend of the petiole nitrate-nitrogen content as influenced by the green manures and fertilization was observed through the season and was found to be closely related to the sucrose content of the beets at harvest.

¹ Contribution from the Department of Agronomy, University of California, Davis.

² Assistant Professor and formerly Assistant Professor of Agronomy, University of California, Davis.

³ The cooperation of Mr. O. T. Rice, Rancher, Mr. H. L. Hall, Farm Adviser, and Mr. F. J. Hills, Extension Agronomist, University of Calif. Ext. Service, in the experiment at Santa Maria is gratefully acknowledged.

Received for publication October 15, 1955. Accepted for publication June 14, 1956.