Farms are more than just crops. livestock grazing covers vast stretches grassland land. Out of 3.7 million square miles.<p>&quot;An estimated 544,784 km² of land were irrigated in 2004. 42.9% of total land area was used as pasture, and 17.5% was forest.&quot; <a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Geography_of_China" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Geography_of_China</a><p>Of note, irrigation allows you to use pastre to grow crops, so they can expand area under cultivation significantly.