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A Physiological Effect of Nitrogen on Phosphorus Absorption by Corn 1
Author(s) -
Leonce F. S.,
Miller M. H.
Publication year - 1966
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1966.00021962005800030001x
Subject(s) - chemistry , phosphorus , nitrogen , pellets , phosphate , pellet , absorption (acoustics) , xylem , nutrient , agronomy , fertilizer , zoology , horticulture , biochemistry , materials science , biology , organic chemistry , composite material
A series of soil and solution experiments were conducted to study the mechanism responsible for the increased P absorption which occurs when N is added to a P fertilizer band. The addition of (NH 4 ) 2 SO 4 or NH 4 Cl to a pellet P‐32 labelled, concentrated superphosphate placed 0.5 inch to the side of a corn root greatly increased the labelled P content of the plant tops. The addition of KNO 3 reduced the P content of the tops when compared to concentrated superphosphate only. When the pellets consisted of phosphate only or phosphate plus KNO 3 , labelled P accumulated to high levels in the root as revealed by autoradiographs. No such accumulation occurred in the presence of NH 4 + ions. The addition of NH 4 NO 3 to a nutrient solution increased the transfer of P through a 1‐inch segment of a corn root exposed to the solution, but did not influence the accumulation in the root. It was concluded that the NH 4 + ion has a specific influence on the transfer of P across the root symplast to the xylem.