Beware allelopathic risk of undersowing

摘要

Perhaps the article "Benefits of undersowing for soil, water and forage" (Livestock, 24 March) should have carried the headline "A cautionary tale when undersowing maize with Italian ryegrass".In what appears to be a pattern of periods of moisture stress in recent growing seasons, asking a field to grow two crops instead of one may pose an unacceptably high risk to the maize yield.