You could remember this in two different ways:
As either a pictogram of a cross sticking out of the soil to mark a grave...
Or as ten crosses sticking out of one fresh plot of soil in a graveyard.
addLearned
土 - Soil
Index # 40
Grade 1
3 strokes
JLPT Level: N5
Readings: ド, ト, つち
Appears in:
46
生
Life
81
先
Previous
98
王
King
109
赤
Red
138
角
Angle
174
寺
Buddhist Temple
190
周
Circumference
219
場
Location
221
地
Ground
228
里
Hometown
245
至
To Reach
309
走
Run
324
社
Company
370
去
Leave
386
坂
Slope
411
幸
Happiness
556
軽
Light (Not Heavy)
651
型
Model
652
堂
Public Chamber
653
塩
Salt
670
径
Diameter