Insecticide/Fertilizer Application Method Trials, 1989

Abstract

Abstract Planting-time and slot injection treatment trials were conducted at Milan and South Charleston, OH. The specific soil types for the respective sites were Tuscola sandy loam and a Brookston silty clay. A randomized complete block design with 4 and 3 replicates was employed at the respective sites. Plots were 40 ft long and 2 rows wide. Corn was planted 19 May at the Milan site and 17 May at South Charleston in 30 inch rows. No planting time treatments were made at the South Charleston site. Planting time treatments were applied with Gandy metering units driven by 12 V electric motors mounted on a 2 row John Deere Max-Merge planter that applied granules ahead of the press wheel in 7-inch bands. Planting time treatments were made at 1.0 and 0.33 lb (AI)/acre. Slot injection insecticide treatments were applied at a rate of 1.0 lb (AI)/acre and 0.33 lb (AI)/acre at 500 psi, delivery rate was 20 gal/acre of finished spray. All Brace treatments were applied at 0.66 instead of 1.0 lb (AI)/ acre for planting and injection treatments. Liquid 28% N fertilizer was applied at a rate of 47 lb (AI)/acre and was used as a carrier instead of water in the non-fertilized treatments. Nozzles were spaced 5 inches off center on both sides of the row (2 rows) and injected into a 3-inch deep slot made by a fluted coulter. Injection treatments were applied 24 Jun and 6 Jul at Milan and South Charleston, respectively. Root rating according to the Iowa 1-6 rating scale was respectively done 20 and 21 Jul for South Charleston and Milan sites. Five root masses/replicate were dug and rated.