Soybean variety response to reniform nematodes in north Alabama, 2012

摘要

Twenty eight different commercial soybean varieties were evaluated for their performance in a reniform infested field near Belle Mina, AL. The soil was a Decatur silt loam (sand, silt, clay of 23-49-28). Plots consisted of 1 row, 25 ft long with 40 in. row spacing and were arranged in a randomized complete block design with four replications. Blocks were separated by 20 ft wide alleys. All plots were maintained throughout the season with standard herbicide, insecticide, and fertility production practices as recommended by the Alabama Cooperative Extension System. Plots were irrigated with a linear sprinkler system as needed. Soil samples for nematode analysis were collected after harvest on 16 Nov. and densities were recorded as nematodes per 150 ccsoil. Plots were harvested on 1 Nov. Data were statistically analyzed by analysis of variance using the generalized linear models (GLM) procedure, and means compared using Fisher’s protected least significant difference (LSD>0.05) test. Monthly averagemaximum temperatures from planting in June through harvest in November were 90.1, 94.4, 88.9, 84, 72.2 and 63.2 °F with average minimum temperatures of 65.7, 72.5, 68.3, 61.1, 49.8 and 35.5 °F, respectively. Rainfall accumulation for each month was 1.21, 4.80, 3.26, 4.97, 3.37 and 1.29 in. with a total of 18.9 in. over the entire season. The rainfall was adequate in May but became limited through the remainder of the season. Temperatures did not reach the 100’s thus this season was more normal for heat units but dry.