When the Frankfurter Allgemeine newspaper ran a front-page article asking, 'Which one is Merkel, which one is Clinton?', comparing cropped snaps of similarly sensible suits as worn by the Chancellor and America's then Secretary of State, Merkel had it framed and presented it to Hillary Clinton as a gift, at a White House state luncheon in 2011.
Comparing crop yields in 2010 to what they would be expected to be if temperature, rainfall and pollution remained at their 1980 levels, the researchers showed that crop yields for wheat were on average 36%lower than they otherwise would have been, while rice production decreased by up to 20%.
Studies comparing crop agronomic response in organic production systems under contrasting tillage practices are lacking.
Comparing crop pathogens, which can vary widely in virulence and impact, turns out to be remarkably international, and examining different plant strains at gene banks around the world sometimes needs to be done in person.
Comparing crops produced from transgenesis and MAB breeding thus offers a viable approach to assessing the potential impact that transgenic crops might have on human health.
In a given location, the net return of pollinator activity could be quantified by comparing crop yield from pollination vs. reductions in yield caused by competition from insect-pollinated weeds.
By comparing crops with their close wild relatives, recent studies have provided new insights into biometric and physiological changes on the seed and the whole plant level [ 44, 45].
At the global scale, the analysis of the yield gap is either based on comparing crop growth models with actual yields as reported in statistics [ 57] or based on empirical techniques that compare highest achieved yields with actual yields reported in the same database to avoid bias due to the use of multiple, inconsistent data sources [ 53,54].
On arable land, SRC are less competitive in many regions compared to cropping systems and thus farmers are interested to establish SRC on grassland.
To some extent, goat husbandry had a higher impact on gross margins when compared to cropping (plots A and B) because farmers used their own crops as feed, inputs for cropping were costly and crops failed due to droughts.
