Fig. 2
From: Improving potassium use efficiency of sugarcane through the use of polyhalite
Uptake of a potassium, b sulfur, c calcium and d chloride as affected by potassium fertilizers in cane and ratoon crop of sugarcane. Source comparison: 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. Dosage comparison: regression analysis, the * in the R2 indicates differences between dosage at a level of significance of 10%. ns non-significant. Error bars (T) represent the standard error of the means (n = 4). Abs control: absolute control K0 = non-K application; K21 = application of 21 mg K dm−3; K42 = application of 42 mg K dm−3; K63 = application of 63 mg K dm−3