University of SaskatchewanHARVEST
  • Login
  • Submit Your Work
  • About
    • About HARVEST
    • Guidelines
    • Browse
      • All of HARVEST
      • Communities & Collections
      • By Issue Date
      • Authors
      • Titles
      • Subjects
      • This Collection
      • By Issue Date
      • Authors
      • Titles
      • Subjects
    • My Account
      • Login
      JavaScript is disabled for your browser. Some features of this site may not work without it.
      View Item 
      • HARVEST
      • Electronic Theses and Dissertations
      • Graduate Theses and Dissertations
      • View Item
      • HARVEST
      • Electronic Theses and Dissertations
      • Graduate Theses and Dissertations
      • View Item

      Response of canola to different seed-row placed fertilizer phosphorus forms, opener configurations and rates of application

      Thumbnail
      View/Open
      SHAO-THESIS-2021.pdf (3.250Mb)
      Date
      2021-02-18
      Author
      Shao, Mingxuan
      ORCID
      0000-0002-2800-2425
      Type
      Thesis
      Degree Level
      Masters
      Metadata
      Show full item record
      Abstract
      Maintaining canola yields requires that phosphorus (P) removed from soil in crop harvest is replaced through P fertilizer application. Rate of P fertilizer application, form used, and method of placement are important factors that influence the crop utilization and yield response to added P. The objective of this thesis work was to assess the influence of P fertilizer application rate, form (mono ammonium phosphate versus struvite) and seed-row opener configuration (narrow versus wide opener spread and row spacing) on canola (B. napus hybrid var LL 252 & L 233P) under controlled environment and field conditions. In the controlled environment study, application of P fertilizer (MAP) at 20 kg P2O5 ha-1 significantly increased early (30 days after seeding) above ground biomass yield compared to the unfertilized control, while further rate increases produced no statistically significant yield increases. Struvite (ammonium magnesium phosphate) performed similar to the mono ammonium phosphate in crop yield response, fertilizer P uptake and recovery. The narrow seed-row opener spread (1”) gave better canola yield response and recovery of P from the two seed-row placed P fertilizers compared to the wide (3”) spread, which is attributed to greater localized concentration of P fertilizer in the narrow spread with concomitant reduced fixation in the soil. Canola emergence after 5 days was delayed with the high seed-row placed P fertilization rate of 60 kg P2O5 ha-1, but the differences among rates were not significant and the emergence recovered at day 10. In the field study, conducted in 2019 at five sites across SK and AB (Saskatoon, Brooks, Lethbridge, Melfort, and Scott) using mono ammonium phosphate as the P source, canola had significant positive biomass yield (above ground plant material at maturity) responses to P fertilization at most sites, with the greatest incremental yield increase associated with the addition of 22 kg P2O5/ha, with responses levelling off at higher rates. Across the sites, the canola biomass yield and P uptake was maximized at rates of 39 to 56 kg P2O5 ha-1. At Brooks, Scott and Lethbridge, significantly higher canola biomass yield and P uptake were observed using the highest seed bed utilization (44%) configuration, which was the combination of widest opener spread (4”) with narrowest (9”) row spacing. Limited and non-significant effects of seed bed utilization were observed at Saskatoon and Melfort sites. The benefit observed from having higher seed bed utilization at three of the five sites in the field study may be explained by greater early season root exploration of the soil volume associated with greater dispersion of seeds and fertilizer throughout the seed bed, with negative effects of greater opener spread that were observed in the controlled environment study not apparent under field conditions.
      Degree
      Master of Science (M.Sc.)
      Department
      Soil Science
      Program
      Soil Science
      Supervisor
      Schoenau, Jeff
      Committee
      Derek, Peak; Patrick, Mooleki; Bingcheng, Si; Christian, Willenborg
      Copyright Date
      January 2021
      URI
      http://hdl.handle.net/10388/13266
      Subject
      Canola
      Phosphate
      fertilizer
      Collections
      • Graduate Theses and Dissertations
      University of Saskatchewan

      University Library

      © University of Saskatchewan
      Contact Us | Disclaimer | Privacy