One Planet NZ has this to say about agricultural waste such as crop protection netting
"Plastic products are used extensively in agricultural applications.
Traditionally, farmers had few options for the disposal of on-farm plastic wastes, due to the contaminated nature of the plastics, low volumes, and distance to markets. So, plastics may have been left in the fields, buried on site, or burnt (which is now illegal). These methods contaminate our air, water, soil and stock. Plastics left on fields may be consumed by animals; and when burnt, can generate the highly toxic, bio-accumulative poisons dioxin and furans. Chemicals from buried plastics may leach into waterways."
Biodegradable crop protection netting is available in New Zealand.
Phone Plasback on 0508 338 240 to book a collection or visit the Plasback website.