Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 March 1973
Published in Agron J 65:236-238 (1973)
© 1973 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Distribution of Nutrients in the Rice Plant and Effect of Two Nitrogen Levels1

D. G. Westfall, W. T. Flinchum and J. W. Stansel2

The use of plant analysis as an aid in making fertilizer recommendations and diagnosing nutritional disorders in rice (Oryza sativa L.) has potential as a production tool. This field experiment was designed to study the distribution of N, P, K, Ca, Mg, Mn, Fe, and Zn in rice plant parts at the panicle differentiation stage of plant development when grown under recommended (134 kg N/ha) and inadequate (67 kg N/ha) N fertility in order to determine the effects of these factors on plant analysis results.

Rice plants grown with inadequate N fertility were lower in N, Mg, Mn, Fe, and Ca in most plant parts analyzed than their counterparts grown with recommended N fertility. The concentration of P was not influenced by N fertility rate. The concentration of plant nutrients varied with plant part and leaf age. The concentrations of N, P, and K were highest in the younger, fully matured leaves and decreased with leaf age. The concentrations of N, Ca, Mg, and Fe in the second leaf were higher than in the whole plant samples.

Both plant parts analyzed and N fertility level in which plants were grown influenced nutrient analysis. The second leaf appears to be more closely correlated with the nutrient needs of the plant at panicle differentiation. As a production tool, the second leaf, or the most recently fully expanded leaf, is recommended to be collected for tissue analysis.

Key Words: Tissue analysis • Element distribution in rice

1 Published as Technical Article No. 9522 with the approval of the Director, Texas Agricultural Experiment Station. Presented before Div. S-4, Soil Sci. Soc. Amer., Miami Beach, Fla., Nov. 2, 1972.

2 Associate Professors, Texas A&M University Agricultural Research and Extension Center, Beaumont, Texas 77706.

Received for publication June 8, 1972.




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and Life Sciences Education		 Soil Science Society of America Journal
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Environmental Quality		 The Plant Genome
Copyright © 1973 by the American Society of Agronomy.