Fig. 3
From: Improving potassium use efficiency of sugarcane through the use of polyhalite
Agronomic efficiency of a potassium (AEK) and b sulfur (AES), considering three dosages of K fertilizers (KCl, PHY, KGK and ½KP) in cane and ratoon crop of sugarcane. Columns followed by the same uppercase letter do not differ statistically by Duncan's multiple range test (p < 0.10) in the cane plant crop, and columns followed by the same lowercase letter do not differ statistically by Duncan's multiple range test in the ratoon crop. Agronomic efficiency of calcium (AECa), considering c cane plant and d ratoon crop of sugarcane. Dosage comparison: columns followed by the same uppercase letter do not differ statistically by Duncan’s multiple range test (p < 0.10); source comparison: columns followed by the same lowercase letter do not differ statistically by Duncan's multiple range test. Error bars (T) represent the standard error of the means (n = 4)