Tagged: Water quality

Unintended effect of DCD on dairy farms: Nitrification blocked in downstream freshwater ecosystems - Waiology

Waiology Feb 28, 2013

By Marc Schallenberg Figure 1. Sign indicating use of dicyandiamide (DCD) on a farm. DCD is a fertiliser additive used to block natural microbial denitrification in the soil, reducing nitrate pollution from dairy farms. Eco-N is the trade name for a product containing DCD.In many ways, the nitrification inhibitor DCD (dicyandiamide), described previously by Dr Bob Wilcock … Read More

The use of dicyandiamide (DCD) to control nitrogen pollution in NZ - Waiology

Waiology Jan 25, 2013

By Bob Wilcock For the last 20 years New Zealand has been undergoing a rapid expansion in dairy farming, driven by commodity prices. New Zealand’s dairy exports, although small on a global scale of production, comprise 30-40% of internationally traded dairy products and are a major component of our gross domestic product (roughly 3%). Dairy farming is an intensive form … Read More

What causes didymo blooms (“rock snot”) in NZ rivers? - Waiology

Waiology Dec 19, 2012

By Cathy Kilroy Ever since the alga Didymosphenia geminata was discovered growing prolifically in a South Island river, scientists have puzzled over how “blooms” (unusually large algal growths) of this alga can form. Rivers below lakes and dams in the South Island have been especially severely affected. Massive, persistent mats of didymo in these rivers have changed their character, reduced … Read More

NZ beaches: Contaminated as - Crikey Creek

Daniel Collins Jan 08, 2010

“Due to water pollution the public are warned against swimming, fishing and taking shellfish in this vicinity.” So say health warnings on many of our beaches. Almost a third of our beaches, lakes and rivers were deemed unsafe by MfE during the 08-09 summer, according to a Consumer NZ report covered by NZ Herald. I’d tell you more if … Read More

MfE groundwater report: “Propaganda” or misunderstood? - Crikey Creek

Daniel Collins Oct 22, 2009

The Ministry for the Environment released a report yesterday on New Zealand’s groundwater quality, prepared by Geological and Nuclear Sciences Ltd. Today, I read in the Christchurch Press that the report concludes that “groundwater quality has no significant relationship with land use”. What’s more, Green Party co-leader Russel Norman called it “propaganda”. Bold claims indeed. Fortunately we can … Read More