In the UK, wheat is often grown in rotation with oilseed rape. Fields in which w

Question

In the UK, wheat is often grown in rotation with oilseed rape. Fields in which wheat is grown every year often show a steady decline in wheat yield. A microbial effect is often thought to be the cause of this. An agricultural research agency is commissioning a project to investigate this.

a) Propose a testable hypothesis for the effect of microbes on wheat yields in continuous cropping (i.e. wheat planted every year).

b) Make a prediction of the effect you will see and explain what you think are the underlying mechanisms.

Explanation / Answer

a) This could be e.g.   
_ continuous cropping causes proliferation of a disease (IRL this is

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