"grain.yield" "plant.density"
"1" 12.2 10
"2" 11.4 10
"3" 12.4 10
"4" 16 20
"5" 15.5 20
"6" 16.5 20
"7" 18.6 30
"8" 20.2 30
"9" 18.2 30
"10" 17.6 40
"11" 19.3 40
"12" 17.1 40
"13" 18 50
"14" 16.4 50
"15" 16.6 50