P kg∙ha⁻¹	N1 kg∙ha⁻¹	N2 kg∙ha⁻¹	N3 kg∙ha⁻¹	N4 kg∙ha⁻¹	Means
P1	14.0	17.7	20.7	21.0	20.8^a
P2	17.7	18.3	20.7	23.0	21.8^a
P3	20.7	22.0	18.3	21.0	19.7^b
Means	17.4^b	19.3^a	19.9^a	21.7^a
Control	Control vs. rest				12.7
Rest	Control vs. rest				19.6