Evaluation of pre-formulated micronutrients products and their interactions with glyphosate on corn growth and yield
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[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Pre-formulated micronutrient fertilizer products are advertised to improve yields and may increase the nutritional content of Missouri's crops. The increase in yields would translate into greater returns for Missouri producers and increased fertilizer sales. Statistics on micronutrient use and yield improvement in Missouri corn are limited. The objectives of this study were to 1) quantify the impacts of selected pre-formulated micronutrient products on growth and development of two corn hybrids (32D79 in 2013; PO636AMX in 2014 and 2015), and 2) compare nutrient uptake and yield between glyphosate and non-glyphosate based weed control with and without micronutrient applications. The following pre-formulated micronutrient products were applied and tested : 1) AgXplore's MicroStarter, 2) Agrisolutions' Ultra-Che Corn Mix, 3) Agrigaurdian's MOLY, 4) Wuxal Top 3, 5) Winfield Max IN ZMB + Max-IN Boron, 6) Inorganic Zn sulfate, Mn sulfate, and Molybdate 7) Control-(non treated) 8) Biotech 8-5-5 chicken liter fertilizer (2014 only). Plant biomass, height, SPAD readings, and leaf area measurements were taken throughout the growing season. In addition, grain yield, ear characteristics as well as nutrient concentrations in all plant tissues were determined at the end of each season. No significant differences were observed among any of the pre-formulated micronutrient products when compared to each other or the control in final grain yield, kernels per row, rows per ear, SPAD measurements, growth stage, plant height, leaf area, nor biomass harvest during vegetative (V6) and reproductive (R4) growth. In nearly all micronutrient treatments, a significant decrease in yield (average across 3 yrs: 620 kg ha-1)was associated with glyphosate-based as compared to non-glyphosate-based weed control Micronutrient and herbicide treatments result in some significant differences in tissue nutrient concentrations, but these differences were not consistent across the two years for which the analyses were conducted. Results from this proje
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