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BROWN MID-RIB TRAIT TRADEOFFS IN SORGHUM-SUDANGRASS AND PEARL MILLET YIELD

Applied Research

Anna Barnett
Extension Agent - Agriculture
University of Arkansas
Salem

Abstract

The brown midrib (BMR) trait has been used to improve the nutritive value of sorghum-sudangrass and pearl millet, however it is known to affect yields. Seed cost/lb might influence seed selection; BMR seed costs twice as much as standard seed. This trial sought to combine yield data and economics for producers considering the BMR trait. A replicated field trial was conducted at the Livestock and Forestry Research Station in Batesville, AR. Pearl millet and sorghum-sudangrass with and without the BMR trait were planted 5/30/24 using an Almaco light duty grain drill. The seeding rate was 25 lb./acre. The plots were managed as either common producer practices (CPP) or best management practices (BMP). Plots were harvested three times. The first two harvests were cut to 6” stubble and the final harvest was at 2” stubble. Harvested forage mass was weighed, and sub-samples were collected for moisture and nutritive value analysis. The presence of the BMR trait did not affect harvested forage mass, nor did species selections. The plots managed according to CPP had higher forage harvests than BMP plots in the first and second harvests. Forage production costs came to a difference of <$0.005/lb between BMR and standard options of both forages. The two-fold seed cost difference seen in BMR and standard summer annual forages does not compare to the greater investments made in weed control, soil fertility, and harvest management. These results suggest farmers should prioritize harvest management regardless of species selection or BMR status, especially on sites with high weed competition.

Poster has NOT been presented at any previous NACAA AM/PIC

This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.

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Authors: Anna Barnett, Kenny Simon, Jonathan Kubesch, Shane Gadberry
  1. Barnett, A. Extension Agent - Agriculture, , Arkansas, 72576
  2. Simon, K. Forage Specialist, University of Arkansas` Division of Agriculture, Arkansas, 72204
  3. Kubesch, J. Forage Specialist, University of Arkansas Division of Agriculture, Arkansas, 72204
  4. Gadberry, S. Director - Livestock and Forestry Research Station, University of Arkansas Division of Agriculture, Arkansas, 72204