Maize Yield Response to Zinc Sources and Effectiveness of Diagnostic Indicators

Figures & data

Table 1. Soil properties of the studied sites except SC (empty cells represent missing values).

Year	2010	2010	2011	2011	2011	2012	2012	2012	2012	2012
State	LA	MN	IN	MN	SD	IN	WI	NE	MN	OH
OM (%)		3.5	2.2		3.2	2.1	2.5	3		3.2
pH	7.3	5.9	5.9		5.5	6.3	7.2	6.8		5.9
Pa(mg kg–1)	37	8	21	13	21	11	23	25	15	29
K(mg kg–1)		98	160	70	235	82	69	767	72	128
Zn (mg kg–1)	1.5	0.91	0.9	1	1.4	0.9	2.9	2.3	1.21

^aExtractant for soil P is weak Bray P except for LA, where it is Mehlich 1.

Figure 1. Average maize yields for different Zn rates as MicroEssentials SZ (MESZ) or ZnSO₄ from trials across 8 states and 3 years (n = 11). All fertilized treatments were balanced for N, P, and S with ammonium sulfate and monoammonium phosphate to match the rates applied with MicroEssentials SZ. Different letters indicate significant differences with the LSD mean separation method at α = 0.05 (420.6 kg ha⁻¹).