HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Mikkelsen, D. S. Articles by Finfrock, D. C. Search for Related Content PubMed Articles by Mikkelsen, D. S. Articles by Finfrock, D. C. Agricola Articles by Mikkelsen, D. S. Articles by Finfrock, D. C.

Availability of Ammoniacal Nitrogen to Lowland Rice as Influenced by Fertilizer Placement¹

Sypnosis: Sub-surface (drilled) placement of ammonium nitrogen produced better growth and yields of lowland rice than similar nitrogen applied on the soil surface (broadcast). Nitrogen content of rice plants and percentage recovery of the applied nitrogen also increased. Ammonium nitrogen drilled 2 to 4 inches into the soil, where reducing conditions developed 3 to 5 days after flooding, remained in the soil and was available to lowland rice. Surface nitrogen, applied by broadcast methods, did not promote the best growth of rice. Losses of surface applied nitrogen apparently occurred through processes of nitrification and subsequently denitrification.

² Assistant Professor and Associate Specialist, Department of Agronomy, University of California. Appreciation is expressed to Mr. S. T. Senewiratne for collecting some of the data.

Received for publication November 26, 1956.