Thursday, 03 January 2019 08:55

It’s time to look at soil health

Written by  Dr Han Eerens, crop science national development manager, Bayer New Zealand
Dr Han Eerens. Dr Han Eerens.

Spare a thought for soil — arguably our most underappreciated natural resource.

Globally, 95% of the food we consume comes from the earth. Soil serves as the earth’s largest natural water filter helping supply the world with fresh, clean water. Additionally, one-quarter of the world’s biodiversity — including millions of microbes which are key to the success of today’s antibiotics — are found in soil. Yet despite all this our soil is being destroyed at a rapid rate.

Continued erosion is central in degrading our soil. To create just 10cm of topsoil takes about 2000 years, but destroying it takes only moments. Erosion accounts for the loss of roughly 24 billion tonnes of arable topsoil globally every year.

In turn, our ability to produce cereals — wheat, rye, barley, oats and corn — is severely impacted. Annually, the world’s cereal production loss equates to 7.6 million tonnes. By 2050, we would have lost over 253m tonnes of cereals.

This is not all. The global population shows no sign of slowing down. Our world population is now about 7.2b, but by 2050 it’s projected to reach almost 9.8b.

And in New Zealand, according to the Ministry of Primary Industries, soil is a crucial building block for agriculture and other land-based primary industries. Erosion is the most critical issue affecting soil and the productivity of the land we use for farming, horticulture and forestry.

In general, farmers have stayed on top of erosion by planting trees or using modern tools such as no-tillage systems and generally relying on glyphosate-based herbicides. No-tillage systems protect soil moisture and the soil itself, both critical to maintain sustainable soil-based agricultural ecosystems.

Without herbicides — especially glyphosate — farmers are likely to revert to traditional methods of soil preparation such as ploughing. This releases more carbon into the atmosphere and contributes to soil degradation.

But although much needs doing redress the damage done so far, the good news is that a growing global movement and scientific advances are helping to restore soil health.

Advances in genetic sequencing have identified a broad range of microbes that can be used to improve our soil’s health and fertility. We now have many means of understanding the complex nature of our soils’ ecosystem and biological make-up. Technology is also contributing to more sustainable farming practices, optimising our use of fertiliser and removing pollutants to maximise our soil productivity while still preserving its health.

Technological innovation, individual effort and global education are all crucial to ensuring the future liveability of our planet. We need to treat each environmental resource with the same level of importance.

• Dr Han Eerens is crop science national development manager, Bayer New Zealand.

More like this

Answers are in the soil

Wairarapa sheep farmer Rob Dick is on a mission to reduce his property’s environmental footprint as quickly as possible – and his approach starts with the soil.

Save our soils — Editorial

There’s been something of a makeover in New Zealand vineyards in recent years, as the clean-cut look of sprayed rows and boundaries loses a little gloss.

National

Deer farmer's roaring success

Southland elk farmer Tom May is no stranger to producing top quality velvet and believes that his Mayfield Elk Farm,…

The beginning - not end!

After seven years, the Red Meat Profit Partnership (RMPP) came to an end on 31 March, yet chair Malcolm Bailey…

Machinery & Products

SIAFD wins punters' plaudits

After celebrating its 70th year last month, it looks like the South Island Agricultural Field Days (SIAFD) has hit its…

Opens up blindspots

Traditionally blind spots caused by large buckets or front mounted loads on wheeled loaders have been a major safety concern.

She's one big feeder

Feeder specialists Hustler has released a maxi-sized multi-feeder aimed at large scale farms in New Zealand and further afield.

Roots out problems

Austrian manufacturer Pöttinger has introduced the new Durastar narrow share for its Synkro and Synkro-T, mounted stubble cultivators.

» The RNG Weather Report

» Latest Print Issues Online

The Hound

Blue murder

OPINION: Your old mate recently read an off-the-wall suggestion, by some boffin, that deliberately staining meat blue will lead to…

Foot in mouth - again!

OPINION: This old mutt reckons Agriculture Minister Damien O'Connor too often suffers from 'foot in mouth' disease.

» Connect with Rural News

» eNewsletter

Subscribe to our weekly newsletter