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 Hall, V. L. Articles by Johnston, T. H. Search for Related Content PubMed Articles by Hall, V. L. Articles by Johnston, T. H. Agricola Articles by Hall, V. L. Articles by Johnston, T. H.

Timing of Nitrogen Fertilization of Rice. II. Culm Elongation as a Guide to Optimum Timing of Applications near Midseason¹

Field studies were conducted with ‘Vegold,’ ‘Nato,’ and ‘Bluebonnet 50’ rice (Oryza saliva L.) in 1963, 1964, and 1965 to determine the optimum time near midseason to apply nitrogen fertilizer for greatest yield. Internode elongation was used as a guide to estimate proper morphological stage of development for the optimum tune to apply nitrogen.

During the 3 years of study all three varieties had grain yield increases of over 1,120 kg/ha that could be attributed to applying midseason nitrogen at the proper time during panicle initiation. Topdressing nitrogen at midseason was found to be most effective when 50% of the plants had elongating internodes equal to or in excess of 12.8 mm for Vegold, 39.7 mm for Nato, and 32-1 mm for Bluebonnet 50.

Key Words: guide to optimum fertilizer timing • culm clongation as guide to fertilize rice

² Assistant Agronomist Arkansas Agr. Exp. Sta., Fayetteville (now with the Ford Foundation, New Delhi, India), Assistant Agronomist Arkansas Agr. Exp. Sta., Stuttgart, (now Assistant Agronomist, University of Kentucky) and Research Agronomist CR-ARS-USDA, Stuttgart, Ark. 72160.