Although soil erosion is a natural occurrence on all land, there are certain factors that call accelerate erosion making it more noticeable and problematic. While there are many different factors that can cause soil erosion, most can be broken down into two main categories: 1  Erosion by Water. 2  Erosion by Wind.
This article is about the plant. For other uses, see Mustard. Brassica juncea, mustard greens, Indian mustard, Chinese mustard, Jie Cai (in Mandarin) or Kai Choi (in Cantonese), or leaf mustard is a species of mustard plant. Subvarieties include southern giant curled mustard, which resembles a headless cabbage such as kale, but with a distinct horseradish-mustard flavor.
Bok choy or pak choi (Chinese: éè; Brassica rapa subsp. chinensis) is a type of Chinese cabbage. Chinensis varieties do not form heads; instead, they have smooth, dark green leaf blades forming a cluster reminiscent of mustard or celery.Chinensis varieties are popular in southern China and Southeast Asia.ther than the ambiguous term Chinese cabbage, the most widely used name in North America for the chinensis variety is bok choy (from Cantonese, literally white vegetable; also spelled pak choi, bok choi, and pak choy).