Soybean nematicide combinations for reniform nematode management in north Alabama, 2018

摘要

Different nematicide combinations were evaluated for reniform nematode management on AG 53X6 soybean at the Tennessee Valley Research and Education Center (TVREC) located near Belle Mina, AL. The soil type was a Decatur silt loam soil with 24% sand, 49% silt, and 28% clay. Seed treatments were applied to the soybean seeds by Bayer CropScience. Seeds were sowed in the field on 08 May 2018. Plots consisted of two rows that were 7.6 meters long with 1-m row spacing, arranged in a RCBD with five replications. All plots were maintained throughout the season with standard herbicide, insecticide, and fertility production practices and a lateral irrigation system was used as needed. Plant stand counts were recorded 16 days after planting (DAP). Plant height, biomass, and nematode population data was collected at 43 DAP. Biomass was calculated as the sum of the root fresh weight and the shoot fresh weight in grams. Nematodes were extracted by soaking the roots in a 6% NaOCl solution on an orbital shaker for4 minutes, and nematodes were collected on a 25-um sieve. Plots were harvested on 23 October. Data was analyzed with SAS 9.4 (SAS Institute, Inc., Cary, NC) using PROC GLIMMIX, and means were compared to the control (Gaucho 600) using Dunnett's method with different significant levels. Monthly maximum temperatures from planting in May through harvest in October were 86.2, 90.8, 91.0, 90.8, 89.3, and 77.2 °F with average minimum temperatures of 75.3, 79.8, 80.8, 80.0, 79.4, and 66.1 °F, respectively.Rainfall accumulation for each month was 3.40, 4.47, 2.20, 4.42, 3.09, and 2.44 in., with a total of 20.02 in. over the season.