
TY  - JOUR
A1  - Gardner, WK 
A1  - Fulton, MC 
A1  - Flood, RG 
T1  - Reclamation of a failed subsurface drainage system on an unstable clay soil
JF  - Australian Journal of Experimental Agriculture
JO  - Aust. J. Exp. Agric.
Y1  - 1991
VL  - 31
IS  - 1
SP  - 93
EP  - 97
KW  - 
UR  - https://doi.org/10.1071/EA9910093 
N2  - The soil structure of a dispersive clay soil on which a subsurface drainage system had failed was modified by applying gypsum (5 t/ha) and growing a crop of sunflowers. The sunflower crop and gypsum application increased macroporosity from 8 to 15% and stabilised the clay microstructure. Sunflowers without gypsum produced a similar increase in soil macroporosity but with a potentially more dispersive clay microstructure. Gypsum alone produced a stable clay microstructure and intermediate values (about 11%) of macroporosity. The yield of wheat was similar on both drained and undrained areas (4 t/ha) following the sunflower crop with and without gypsum application, whereas on untreated areas, yields were 2.1 t/ha in the absence of drainage and 3.3 t/ha when drained. 
ER  -

