Chemicals were necessary - without them to boost yield 'we should all start the slide down a starvation trail'.

In addition to the hope that this plan would boost yield and stave off famine, officials presented the project as symbolic.

But investors looking for a better rental income might consider the coastal areas, where lower prices will boost yields.

The crop has boosted yields, cut pesticide use and brought back farmland wildlife.

Warmer summers and milder autumns are boosting yields — perhaps the only plus of global warming.