GM Watch
  • Main Menu
    • Home
    • News
      • Newsletter subscription
      • News Reviews
      • News Languages
        • Notícias em Português
        • Nieuws in het Nederlands
        • Nachrichten in Deutsch
      • Archive
    • Articles
      • GM Myth Makers
      • GM Reports
      • GM Quotes
      • GM Myths
      • Non-GM successes
      • GM Firms
        • Monsanto: a history
        • Monsanto: resources
        • Bayer: a history
        • Bayer: resources
    • Videos
      • Latest Videos
      • Must see videos
      • Agriculture videos
      • Labeling videos
      • Animals videos
      • Corporations videos
      • Corporate takeover videos
      • Contamination videos
      • Latin America videos
      • India videos
      • Asia videos
      • Food safety videos
      • Songs videos
      • Protests videos
      • Biofuel myths videos
      • Index of GM crops and foods
      • Index of speakers
      • Health Effects
    • Contact
    • About
    • Donations
News and comment on genetically modified foods and their associated pesticides    
  • News
    • Newsletter subscription
    • News Reviews
    • News Languages
      • Notícias em Português
      • Nieuws in het Nederlands
      • Nachrichten in Deutsch
    • Archive
  • Articles
    • GM Myth Makers
    • GM Reports
    • GM Quotes
    • GM Myths
    • Non-GM successes
    • GM Firms
      • Monsanto: a history
      • Monsanto: resources
      • Bayer: a history
      • Bayer: resources
  • Donations
  • Videos
    • Index of speakers
    • Glyphosate Videos
    • Latest Videos
    • Must see videos
    • Health Effects
    • Agriculture videos
    • Labeling videos
    • Animals videos
    • Corporations videos
    • Corporate takeover videos
    • Contamination videos
    • Latin America videos
    • India videos
    • Asia videos
    • Food safety videos
    • Songs videos
    • Protests videos
    • Biofuel myths videos
    • Index of GM crops and foods
  • Contact
  • About
SUBSCRIBE TO REVIEWS

GMWatch Facebook cornfield banner

INTRODUCTION TO GM

GMO Myths and Facts front page.jpg

SCIENCE SUPPORTS REGULATION OF GENE EDITING

Plant tissue cultures

GENE EDITING: UNEXPECTED OUTCOMES AND RISKS

Damaged DNA on fire

GENE EDITING MYTHS AND REALITY

A guide through the smokescreen

Gene Editing Myths and Reality

ON-TARGET EFFECTS OF GENE EDITING

Damaged DNA

News Menu

  • Latest News
  • News Reviews
  • Archive
  • Languages

News Archive

  • 2022 articles
  • 2021 articles
  • 2020 articles
  • 2019 articles
  • 2018 articles
  • 2017 articles
  • 2016 articles
  • 2015 articles
  • 2014 articles
  • 2013 articles
  • 2012 articles
  • 2011 articles
  • 2010 articles
  • 2009 articles
  • 2008 articles
  • 2007 articles
  • 2006 articles
  • 2005 articles
  • 2004 articles
  • 2003 articles
  • 2002 articles
  • 2001 articles
  • 2000 articles

Please support GMWatch

Donations

You can donate via Paypal or credit/debit card.

Some of you have opted to give a regular donation. This is greatly appreciated as it helps place us on a more stable financial basis. Thank you for your support!

Bt maize inferior yield

  • Print
  • Email
Details
Published: 18 August 2005
Twitter

Development, yield, grain moisture and nitrogen uptake of Bt corn hybrids and their conventional near-isolines.
October 14, 2005
Field Crops Research 93: 199*211
B.L. Ma and K.D. Subedi

ABSTRACT

There are concerns over the economic benefits of corn (Zea mays L.) hybrids with the Bt trait transferred from Bacillus thuringiensis. A field experiment including three to seven pairs of commercial hybrids and their transgenic Bt near-isolines were grown side-by-side for three consecutive years in Ottawa, Canada (458170N, 758450W; 93 m above sea level) to determine (i) which hybrid had the highest yielding potential, (ii) if there was a differential response of Bt and non-Bt hybrids to N application, and (iii) under natural infestation of European corn borer (ECB), whether there was a yield advantage of Bt over non-Bt hybrids to justify their cost.

We found that some of the Bt hybrids took 2*3 additional days to reach silking and maturity, and produced a similar or up to 12% lower grain yields with 3*5% higher grain moisture at maturity, in comparison with their non-Bt counterpart.

Although N application increased grain yield and N uptake in 2 of the 3 years, there was no N-by-hybrid interaction on yield or other agronomic traits. Most Bt hybrids had similar to or lower total N content in grain with higher N in stover than their respective non-Bt near-isolines. Under extreme weather conditions (e.g. cool air temperature at planting and severe drought during the development), some of the hybrids (both Bt and non-Bt) required up to 400 additional crop heat units (CHU) to reach physiological maturity than indicated by the supplying companies. Our data suggest that within the same maturity group, it was the superior hybrids (non-Bt trait) that led to the greatest N accumulation, and the highest grain yield. Under the conditions tested, there was no yield advantage of Bt hybrids in comparison with their conventional counterparts when stalk lodging and breakage of the non-Bt counterpart by ECB was low to moderate.

Menu

Home

Subscriptions

News Archive

News Reviews

Videos

Articles

GM Myth Makers

GM Reports

GM Myths

GM Quotes

Non-GM Successes

Contacts

Contact Us

About

Facebook

Twitter

Donations

Content 1999 - 2022 GMWatch.
Web Development By SCS Web Design