
%0 Journal Article
%A Taylor, AC 
%A Lill, WJ 
%T Response of soil mineral nitrogen to total nitrogen and land-use in a long-term study of wheat pasture rotations
%J Australian Journal of Experimental Agriculture
%D 1988/08/01
%V 28
%N 4
%P 525-527
%K 
%R https://doi.org/10.1071/EA9880525
%U https://www.publish.csiro.au/paper/EA9880525 
%X All 6 treatments of a long-term wheat-pasture rotation experiment were soil sampled after a cultivated fallow close to sowing at Wagga Wagga. Analyses of the nitrogen (N) data show that total N (0-1 5 cm) could be used as a predictor of mineral N in the profile at sowing. Mineral N levels were expressed as a percentage of total N and reported as a mineralisation index. This index increased after a period of clover and was considerably higher for the first crop after pasture than for subsequent crops. The mineralisation index also increased as the pasture intensity (years pasture/total years) increased from 0.33 to 0.67. Total N alone accounted for no more than 20% of the variation in mineral N at sowing. The variance accounted for increased to 49.9 and 53.7% respectively when pasture frequency and crop number after pasture were included in the models. 
