Over the past two decades, many journals have published papers describing how modifying one or a few genes can result in substantial increases in crop yields. The reported increases range from 10% to 68%, and the crops analysed include rice, maize (corn), tobacco and soya bean.
These studies have contributed important insights in molecular biology and gene discovery. But many are the results of tests conducted in greenhouses or in small-scale field trials — the latter typically involving plants grown in small plots. Few, if any, have used the experimental designs needed to evaluate crop performance in real-world environments. And hardly any findings have translated into yield increases on actual farms.
Especially in the context of climate change and a growing human population, the growth of misleading claims around yields has become a cause of concern to us.
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