AbstractsBiology & Animal Science

Soybean Yield Response in High and Low Input Production Systems

by Grace M Bluck

Institution: The Ohio State University
Department: Horticulture and Crop Science
Degree: MS
Year: 2015
Keywords: Agronomy; Agriculture; Plant Pathology; Plant Sciences; soybean; yield; inoculant; fungicide; insecticide; manganese; gypsum; soybean disease; pyraclostrobin; lambda-cyhalothrin; high input; agronomy; agriculture; Ohio agriculture; frogeye; brown spot
Record ID: 2059221
Full text PDF: http://rave.ohiolink.edu/etdc/view?acc_num=osu1428078516


From 2000 to 2013 soybean [Glycine max (L.) Merr] grain commodity price has increased by almost 300% generating interest in agricultural inputs to maximize soybean yield. The objective of this study was to evaluate the effect of common inputs on soybean grain yield in enhanced (high-input) and traditional (low-input) production systems. The inputs evaluated included: Rhizobia inoculant, gypsum, pyraclostrobin fungicide, lambda-cyhalothrin insecticide, and manganese (Mn) foliar fertilizer. A sixteen site-year trial was established in Ohio during 2013 and 2014. Rhizobia inoculant was seed applied before planting, gypsum was applied at the VC growth stage (unrolled unifoliate leaves), and fungicide, insecticide, and Mn foliar fertilizer were applied at the R3 growth stage (initial pod development). Measurements of percent leaf area affected by foliar disease and insect defoliation and Mn and sulfur (S) concentration in leaves were collected at six site-years. The omission of pyraclostrobin from the enhanced production system significantly reduced yield in five of sixteen site-years by 0.21 to 0.79 Mg ha-1, but its addition to a traditional system increased yield significantly at only one of sixteen site-years by 0.47 Mg ha-1 Soybean yield was influenced by fungicide application when fields had disease present, above average yield (>3.5 Mg ha-1), and received >25 cm of precipitation in June and July. During 2013 and 2014, with established corn/soybean rotations, no S or Mn deficiencies, and minimal insect pressure, there were limited effects of inoculant, gypsum, insecticide, and Mn foliar fertilizer on grain yield. The data indicate a very small potential for high-input production systems to enhance crop yield without the presence of diseases, insects, or nutrient deficiencies. Knowledge of potential yield limiting factors is useful in identifying inputs that will increase soybean yield on a field by field basis.