下半场

• 一(horizontal line; boundary)RADICAL
• 卜(stroke descending downward)ASSOCIATIVE

A vertical stroke pointing downward across a boundary line marks 'below'.

• 丷(two diagonal strokes; division in half)ASSOCIATIVE
• 牛(cow; cattle)ASSOCIATIVE

Using a knife to split a cow in half equally shows the meaning of 半 (half).

• 土(earth; soil; land)RADICAL
• 勿(don't; must not)PHONETIC

A wide field of land sounds similar to the word for things or objects.