Premium
Residual Effect of Large Applications of Phosphorus on High Phosphorus Fixing Soils 1
Author(s) -
Kamprath E. J.
Publication year - 1967
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/agronj1967.00021962005900010007x
Subject(s) - phosphorus , acre , soil water , agronomy , grain yield , chemistry , zea mays , yield (engineering) , residual , amendment , zoology , environmental science , biology , mathematics , materials science , soil science , metallurgy , organic chemistry , algorithm , political science , law
Large initial applications of P to high P‐fixing soils had a marked residual effect on the yield of corn ( Zea mays L. ) 7 to 9 years after application. On a Georgeville soil very low in available phosphorus, an initial application of 612 pounds of P per acre 9 years earlier was still supplying sufficient P for high corn yields. Response of corn to 22 pounds of P per acre applied in a band was significantly affected by the P applied 8 and 9 years earlier. Similar results were found with the P uptake by corn grain. Above 8 ppm of available soil P (0.05N HCl + 0.025N H 2 SO 4 , extractant), there was no further increase in corn yields. For high corn yields on high P fixing soils, the entire root zone rather than isolated bands should have a high level of P.