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2011 Research results available

Fri, Dec 9th, 2011
Posted in Agriculture

The results from a number of University of Minnesota 2011 research trials are becoming available. I have received individual results on MN Corn Hybrid Performance Trials, Corn Response to Micronutrients across Minnesota, Soybean Response to Micronutrients across Minnesota, Corn Silage Hybrid Trials, MicroEssential-SZ as a Fertilizer Source for Soybean, Liberty Link Soybean Variety Trials, and the Corn Silage Foliar Fungicide Trial. If things go according to plan, all these plus many others will be combined in the 2011 Southern Minnesota Regional Research & Demonstration Summary that will be made available at the Winter Crops Day scheduled for Wednesday, January 11, 2012 at the Good Times Restaurant in Caledonia.

Today, I would like to highlight the 2011 Corn Silage Foliar Fungicide Research Trial, because there has been a significant increase in questions regarding the economical use of foliar fungicide in Midwest corn silage production. Little university research has been conducted to verify its effect on yield, quality, and ultimately economics. As a result, the Universities of Wisconsin and Minnesota implemented a cooperative research trial starting in 2009 near La Crescent, MN using three commonly used fungicides on two high yielding corn silage hybrids.

The trial included two corn silage hybrids; NK N53W-3000GT and De Kalb DKC 57-50, which were selected based on their performance in the 2010 Minnesota and Wisconsin corn silage hybrid trials. In 2011 V5 and R1 treatment timings were evaluated. Foliar fungicides were applied at the following timings; V5 applications were Headline (6.0 fl. oz/a), Quadris (6.0 fl. oz/a), and Stratego YLD (2.5 fl. oz/a), R1 applications were Headline AMP (10.0 fl. oz/a), Quilt Xcel (10.5 fl. oz/a) and Stratego YLD (5.0 fl. oz/a). The trial was set up in a randomized complete block design, with four replications. Each plot was four 30-inch rows, twenty feet long.Fungicides were applied with a back-pack sprayer using a high-clearance, telescoping boom (R&D Sprayers, Opelousas, LA) equipped with 11003XR flat fan nozzles at 40 psi delivering a total volume of 18.3 gallons per acre at V5 and 20.6 gallons per acre at R1. Volume differences are due to sprayer configuration differences between the application timings.

The plot was rated for foliar disease intensity based on percentage of leaf area infected at the time of fungicide applications and at harvest (i.e., severity). Fungicide treatments were applied on 16 June 2011 (V5) and 24 July 2011 (R1).

The plot was harvested 19 September 2011. Silage samples were collected at harvest and analyzed at UW forage testing labs and quality was determined using the MILK 2006 equation for calculating corn silage quality. Only one of the center two rows of each treatment replication was harvested, measured for yield, and sampled for quality.

Similar to 2009 and 2010, results indicated no evidence of a statistical or economic advantage for using a foliar fungicide for yield or quality. Hybrid selection, similar to other years, was found to be a more important component of production compared to the use of a foliar fungicide.

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