The Effects of Nitrogen on Short-Term Phosphorus Absorption and Translocation in Corn (Zea Mays)
1963
Cole, C. V. | Grunes, D. L. | Porter, L. K. | Olsen, S. R.
Short-term P uptake studies were conducted with intact 1-month-old corn plants of differential N and P composition. Supplemental N pretreatments producing increased growth rates and higher levels of N in the plant stimulated the rate of P uptake per unit dry weight of root more than did a tenfold increase in P concentration in the external solution. Nitrogen pretreatments caused five- to tenfold increases in rate of P translocation to the tops during the uptake period. The presence of nitrate or ammonium ions in the test solution during the uptake period had negligible effects on P uptake rates. Phosphorus uptake rates were highly correlated with total N level in the roots. The stimulation of P uptake rates with higher plant N levels suggests a connection between N metabolism and P uptake processes.
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