soil	yield
sand	6
sand	10
sand	8
sand	6
sand	14
sand	17
sand	9
sand	11
sand	7
sand	11
clay	17
clay	15
clay	3
clay	11
clay	14
clay	12
clay	12
clay	8
clay	10
clay	13
loam	13
loam	16
loam	9
loam	12
loam	15
loam	16
loam	17
loam	13
loam	18
loam	14