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Nitrogen and phosphorus fertilizer sources and placement methods in maize (Zea mays L.) using labelled fertilizers

Published online by Cambridge University Press:  27 March 2009

E. P. Papanicolaou
Affiliation:
Department of Soil Science and Plant Nutrition, Nuclear Research Center‘Democritos,’ Aghia Paraskevi, Attiki, Greece
V. D. Skarlou
Affiliation:
Department of Soil Science and Plant Nutrition, Nuclear Research Center‘Democritos,’ Aghia Paraskevi, Attiki, Greece
C. Nobeli
Affiliation:
Department of Soil Science and Plant Nutrition, Nuclear Research Center‘Democritos,’ Aghia Paraskevi, Attiki, Greece
N. S. Katranis
Affiliation:
Agricultural Research Station, Vardates, Fthiolis, Greece

Summary

The influence of various nitrogen and phosphorus sources, applied at the preseeding stage with two placement methods, on maize yield and fertilizer utilization, was studied in two field experiments and a pot experiment with a calcareous, heavy to medium heavy textured recent alluvial soil.

Phosphorus alone had no effect on crop yield. Nitrogen alone or nitrogen (various forms) and phosphorus had a clear positive effect on crop yield. As to the various sources the observed differences in the crop yield of the field experiments were not significant, while in the pot experiment ammonium sulphate gave the highest yields.

The data on the phosphate concentrations in the tops derived from phosphate fertilizer (Pf) indicate that the presence of nitrogen increased the utilization of phosphorus fertilizer. From the tested placement methods the incorporation method appears clearly superior in the pot experiment with a similar trend in the field experiment for all sources except ammonium phosphate-sulphate.

The utilization coefficients of the nitrogen fertilizer sources suggest that ammonium and urea were better utilized than nitrates, that the higher nitrogen utilization reflected higher yields and that phosphorus fertilizer exerted a beneficial effect on nitrogen fertilizer utilization. Finally they suggest that the addition of 120 kg N/ha enhanced the amount of soil nitrogen taken up in the maize grain by 53%.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1983

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