id	keyword
afs-71946	magnesium
afs-71946	magnesium content
afs-71946	magnesium fertilization
afs-71946	potassium
afs-71946	grains
afs-71946	straws
afs-71946	rate
afs-71946	year
afs-71946	nitrogen
afs-71946	potassium fertilization
afs-71946	potassium content