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- W59353040 abstract "Onion production in the western United States suffers significant damage from iris yellow spot virus (IYSV) and onion thrips. IYSV is thrips vectored and primary control is from heavy insecticide use, resulting in an increase in pesticide resistance and virus spread. The objective of this study was to identify crop management strategies to enhance onion productivity and suppress thrips and IYSV. Three fertility programs and two crop rotations were tested for their effects on onion growth and yield, soil properties, thrips density and IYSV incidence. Thrips adult, nymph and egg populations were monitored from whole plant and leaf samples of onion. Reduced nitrogen (N) input (133.8 kg N/ha, one-third the standard grower rate), resulted in no significant reduction in yield or storage quality; however time to crop maturity was delayed as compared to the standard rate of N fertilizer (401.83 kg N/ha) . Soil microbial activity, as measured by dehydrogenase activity, was decreased by the higher N treatment. Soil biostimulant applications coupled with the low rate N fertilizer showed no effect on microbial activity. The standard N rate treatment also had greater soil nitrate levels and numbers of adult and immature as compared to lower N treatments. Soil microbial biomass and readily mineralizable carbon was greater after wheat than after corn. Results suggest that reduced N treatment, when not coupled with biostimulant application, decreased attractiveness 1 Coauthored by K. Buckland, J.R. Reeve, D. Alston, C. Nischwitz, D. Drost 10 of onions to thrips, created a more favorable environment for microbial activity and reduced threat of nitrate leaching while sustaining onion yields." @default.
- W59353040 created "2016-06-24" @default.
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- W59353040 date "2011-01-01" @default.
- W59353040 modified "2023-09-27" @default.
- W59353040 title "Evaluating fertilizer rate, crop rotation and trap crops for effects on onion growth and yield, soil health, thrips densities and Iris Yellow Spot Virus incidence" @default.
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