block fert variety yield
1 1 1 35.4
1 1 2 37.9
2 1 1 41.6
2 1 2 40.3
1 2 1 36.7
1 2 2 38.2
2 2 1 42.7
2 2 2 41.6
1 3 1 34.8
1 3 2 36.4
2 3 1 43.6
2 3 2 42.8
1 4 1 39.5
1 4 2 40.0
2 4 1 44.5
2 4 2 47.6