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Enhanced Phosphorus Status of Maize Resulting from Nitrogen Fertilization of High Phosphorus Soils¹

ABSTRACT

Short-term greenhouse and culture solution studies have shown that P uptake and translocation is regulated by N. The objective of this study was to determine the effect of N rate on P status of corn (Zea mays L.) grown on soils with varying levels of available P in the range adequate for growth. Field experiments were conducted on Dothan (Plinthic Paleudults), Goldsboro (Aquic Paleudults), and Portsmouth (Typic Umbraquults) soils. Nitrogen rates used were 0, 56, 112, 168, and 224 kg N ha^–1 supplied as NH₄NO₃ and urea. Phosphorus was applied at a rate of 22 kg P ha^–1. Leaf P concentration at silking was increased by N fertilization and was highly correlated with leaf N concentration. Total Paccumulation was highly correlated with total N accumulation. Available soil P levels had little effect on leaf P concentration and total P accumulation. Nitrogen supply was the main factor affecting the P content of corn on soils with adequate levels of available P.

¹ Paper no. 10947 of the Journal Series of the North Carolina Agric. Res. Serv., Raleigh, NC 27695-7601.

² Professor of Soil Science, North Carolina State Univ., Raleigh, NC 27695-7619.

Received for publication March 23, 1987.

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