《农桑辑要·瓜菜·葵》
春天多风干旱，一定要开畦种，开畦种，既可节省土地，收葵又多，一畦葵足够一个人食用。
春多风旱，非畦不得，且畦者省地而菜多，一畦供一口。
It is dry and windy in spring, so it is necessary to grow in ridges. Growing in ridges can save land and harvest more sunflowers. A ridge of sunflowers is enough for one person to eat.