As part of a review of changing patterns of variability in cereal production around the world, the situation in Australia is examined both by major cereal crops and by State in which they are grown. The Australian results are generally consistent with those found in parts of both the industrial...

A small case study of published data on response of dryland wheat to nitrogen fertilizer reveals that replication over space apparently substitutes rather poorly for replication over time, in estimating variance of yield conditional on level of fertilizer.