SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 34:87-90 (1970)
© 1970 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Influence of Nitrogen on Phosphorus Absorption and Translocation in Zea mays1

S. J. Thien and W. W. McFee2

ABSTRACT

The effect of metabolized N and N in solution on P absorption and translocation in corn was studied in growth chamber experiments. Two-week-old corn plants of various N and P contents were prepared by pre-treatment in NH4+, NO3-, P or water solutions for 24 hours. Plants were then transferred to treatment solutions containing labelled P alone or with a N source. Uptake and translocation of labelled P was continuously monitored for 6 hours.

Nitrogen pretreatment of corn plants significantly increased P absorption and translocation rates during the following 6 hours. These effects were absent when N was omitted from the pretreatment solution and accompanied P only during the treatment period, indicating no companion effect of these two nutrients on movement into root cells. Phosphorus absorption and translocation were stimulated to different degrees suggesting two separate transport systems involved in P uptake and translocation. The observations suggest the existence of a N-requiring metabolite influencing the efficiency of P absorption and translocation mechanisms in corn. No significant difference between the N sources, NH4Cl or NaNO3, was observed.

NOTES

1 Journal Paper no. 3462, Purdue Univ. Agr. Exp. Sta., Lafayette, Ind. Contribution from the Agronomy Department. Presented before Div. S-4, Soil Science Society of America, Nov. 14, 1968.

2 Graduate Assistant and Associate Professor of Soils Purdue Univ. respectively.

Received for publication July 29, 1969. Accepted for publication September 10, 1969.






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