
TY  - JOUR
A1  - Piper, CS 
A1  - de, Vries MPC 
T1  - The residual value of superphosphate on a red-brown earth in South Australia
JF  - Australian Journal of Agricultural Research
JO  - Aust. J.  Agric. Res.
Y1  - 1964
VL  - 15
IS  - 2
SP  - 234
EP  - 272
KW  - 
UR  - https://doi.org/10.1071/AR9640234 
N2  - The residual value of superphosphate on a red-brown earth naturally deficient in phosphate has been determined by means of a field experiment. pot trials. and chemical extractions . In a field experiment on a site where 24&frac12; cwt of superphosphate per acre had been previously applied over a period of 23 years, it was found that wheat. in a wheat-barley-fallow rotation. could be grown for 5 years before a clearly defined response developed to superphosphate currently applied at 11 lb (P1) or 22 lb (P2) phosphorus pentoxide (P2O5 ) per acre . Stubble-sown barley showed a response after the first year. 
ER  -

