Abstract
A new co-granulated formulation of monoammonium phosphate (MAP) including S and Zn could allow for more uniform nutrient distribution. A six site-year study evaluated the effects of blended phosphorus (P) sources [MAP and diammonium phosphate (DAP)] and zinc amounts (0, 2.2, and 5.6 kg Zn ha-1) compared to co-granulated fertilizer, MicroEssentials® Sulfur-10 (MES10™) (12-40-0-10S) and MicroEssentials Sulfur and Zinc (MESZ™) (12-40-0-10S-1Zn), on corn and soybean response. Fertilizers were broadcast applied for corn and the carry-over effect on soybean was determined. Ear leaf P, S, and Zn concentrations at Novelty in 2013 and 2014 were within the sufficiency range regardless of treatment, even though initial soil test values were low-medium. Yields were similar to the N only control for all site-years except at Novelty in 2013, where MAP+ZnSO4 at 2.2 kg Zn ha-1, MAP+Super Zn at 5.5 kg Zn ha-1, and DAP+AMS were 540 to 570 kg/ha greater. The amount of Zn fertilizer (2.2 vs. 5.6 kg Zn ha-1) also showed no significant effect on yield. Applications of P or Zn generally increased their concentrations in post-harvest soil samples. Fertilizer applied for corn indicated some differences in soybean plant nutrient concentrations, but it had no effect on total plant nutrient uptake, grain yield or quality. At Novelty, soybean plant Zn concentration was greater at 5.6 kg Zn ha-1 compared to 2.2 kg Zn ha-1, while Albany showed an increase in whole soybean plant Zn concentration with SuperZn compared to ZnSO4. Carry-over fertilizer from corn showed limited effects on soybean response the following year.
Highlights
Zinc (Zn) is essential to plant survival, with the average plant containing 20 ppm of the micronutrient based on dry weight (Mahler, 2004)
All treatments were similar for ear leaf Zn concentration at VT, except for the non-treated control, which was significantly lower than all other treatments and for MES10, which was significantly lower than N-only and diammonium phosphate (DAP)+ZnSO4 at 5.6 kg Zn ha-1
Yields showed no significant differences at Novelty in 2013, and all treatments were similar at Novelty in 2011
Summary
Zinc (Zn) is essential to plant survival, with the average plant containing 20 ppm of the micronutrient based on dry weight (Mahler, 2004). Typical soils can contain 0.3 to 2.0 ppm (Mahler, 2004) of plant-available Zn, which is the most common deficient micronutrient in high pH soils (Graham, Asher, & Hynes, 1992). Zn fertilizers are available in three major forms: Zn chelate, ZnO, and ZnSO4 (Schulte, 2004). Zinc sulfate is the most common form, due to its low cost and greater solubility (Schulte, 2004), and has traditionally been a steadfast source in Zn fertilizer (Olsen, 1982)
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