This RIRDC report is an important addition to understanding the dynamics of organic agriculture. The report brings productivity data gathered under several previous projects within Tasmania (from 1995 to present) together with contemporary data. By the publication of these figures the report seeks to initiate a national ‘standardisation’ of benchmarking data units within the industry, with particular emphasis on soil nutrient levels.
One of the major findings of the report is that zero and low input systems are generally restricted to grazing enterprises, and are not sustainable on most soil types. However, under certain circumstances, and on some soil types, it would appear that closed-input systems are able to maintain moderate to high yields over 20 to 30 years of operation.