Response of Hard Red Spring Wheat Genotypes to Management Systems
- Aslam Khan and
- LeRoy A. Spilde
Average yields of hard red spring wheat (HRSW) (Triticum aestivum L.) are low compared with the intensively managed winter wheat of western Europe. Information on intensive cereal management (ICM) of HRSW is limited in the USA. This study was conducted to investigate the agronomic response of 12 HRSW genotypes to ICM inputs. A randomized complete-block design in a split-plot arrangement was used with genotypes as main plots and management systems as subplots. Genotypic selection was based on year of selection from 1911 through 1986. The ICM treatment consisted of imazalil (1-[2-(2,4-dichlorophenyl)-2(2-propenyloxy)ethyl]-H-imidazole), seed treatment, foliar N application applied at 55 kg ha−1 in three growth stags and foliar application of ethephon [(2-chloroethyl)phosphonic acid], and propiconazole [1-[2-(2,4-dichlorophenyl)4-propyl-1,3-dioxolan-2-ylmethyl]-1H-1,2,4-triazole], at growth stage 10 to control lodging and foliar diseases, respectively. The control treatment did not include any ICM inputs. Genotypes responded similarly to management systems regardless of selection year. The ICM treatment decreased (P < 0.05) plant height, lodging, grain yield, protein yield, test weight, kernel weight, foliar diseases, common root rot disease severity and incidence, and delayed heading and maturity when averaged across environments and genotypes. Protein concentration increased, but the increase was too small to positively influence economic value. Grain yield of five genotypes was significantly reduced by ICM inputs. Results from this study indicated that these inputs were not a viable option when employed as a complete package in our northern U.S. environment.
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