Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 


Stubble Burning In Canterbury Damages The Soil

Stubble Burning In Canterbury Damages The Soil

March 11, 2014

An international soil scientist is critical of the practice of burning residue which often occurs on farms after harvest.

Dr John Baker visited Mid Canterbury recently and witnessed a large scale burn off near Chertsey polluting the atmosphere. While it may not have harmed the soil at the time, it certainly will destroy much of the opportunity to improve the soil health in the future he says.

He says burning residues simply removes most of the carbon present in the residues of the previous crop by converting it to CO2 by combustion.

“The main way to maximise arable soil quality and health is to increase its carbon content, not burn it off. Increasing carbon and soil microbial activity in turn builds soil structure and is one of the strongest indicators of soil health or quality,” Dr Baker says.

Dr Baker, who has a MAgrSc in soil science and Ph.D in agricultural engineering from Massey University, has reacted with caution to a recent Foundation for Arable Research (FAR) report that “stubble burning is valued by some farmers as a rapid, economic and relatively benign way of dealing with crop residue.”

“Burning is bad for the soil as it destroys all the available new organic matter which is used to build humus. Residue feeds worms and builds soil organic matter,” he comments.

Dr Baker concedes that occasional burning can help with weed and pest control but is critical that FAR sees burning as creating a basis for a more productive and profitable farming system. Most of the evidence is to the contrary he points out.

“Retaining residue and seeding through it with low-disturbance no-tillage is a far superior method than intensive tillage (ploughing) with or without burning. Any form of tillage is also detrimental to soil quality,” he says.

Dr Baker, who was a finalist for the World Food Prize in 2013, cannot over-emphasise the importance of good quality soil. He says the single greatest challenge facing the world today is feeding the extra 50 percent population by the year 2050.

“Only four percent of the world’s surface has arable soil and that’s not likely to increase so we have to farm it more sustainably which we simply haven’t been doing,” he says.

“To farm it sustainably and increase crop yields requires preserving and maintaining soil quality and organic matter. I don’t see that happening on properties where stubble burning is a regular occurrence.”

Dr Baker has been researching no-tillage for 40 years and invented and manufactured a low-disturbance no-tillage drill that penetrates through crop residue on top of the ground and sows seeds and fertiliser directly into unploughed ground.

“No-tillage is the equivalent of keyhole surgery as opposed to ploughing which is invasive surgery,” he says.

“Good no-tillage causes minimal disturbance to the soil, traps the humidity, preserves micro-organisms and soil life, largely prevents carbon from escaping into the atmosphere and significantly improves crop yields. One kilogram of humus in the soil holds as much water as nine kilograms of clay. So it’s a no-brainer really.”

“It will simply become the key to feeding our world in the years to come.”

Ends

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

BusinessDesk: APN's NZME Sees Future In Paywalls, Growth In Digital Sales

APN News & Media has touted a single newsroom concept for its NZME unit in New Zealand, similar to what Germany's Die Welt uses, saying an 'integrated sales proposition' is helping it win market share, including ... More>>

Labour Party: Global Milk Prices Now Lowest In 6 Years

The latest fall in the global dairy price has brought it to the lowest level in six years and shows there must be meaningful action in tomorrow’s Budget to diversify the economy, says Labour’s Finance spokesperson Grant Robertson. “Dairy prices ... More>>

BusinessDesk: NZ Inflation Expectations Creep Higher In June Survey

May 19 (BusinessDesk) - New Zealand businesses lifted their expectations for inflation over the next two years, sapping any immediate pressure on the Reserve Bank to cut interest rates, and prompting the kiwi dollar to jump higher. More>>

BusinessDesk: Lower Fuel Costs Drive Down NZ Producer Input, Output Prices

May 19 - Producer input and output prices fell in the first quarter, mainly reflecting lower fuel costs and weakness in prices of meat and dairy products. More>>

Media: Fairfax Media NZ Announces Senior Editorial Team

Fairfax Media New Zealand has today confirmed its new editorial leadership team, as part of a transformation of its newsrooms aimed at enhancing local and national journalism across digital and print. More>>

Science: Flavonoids Reduce Cold And Cough Risk

Flavonoids reduce cold and cough risk Research from the University of Auckland shows eating flavonoids – found in green tea, apples, blueberries, cocoa, red wine and onions – can significantly reduce the risk of catching colds and coughs. The research, ... More>>


BusinessDesk: RBNZ House Alert Speech The Catalyst For Government Action

Prime Minister John Key all but conceded that pressure from the Reserve Bank of New Zealand for concerted action on rampant Auckland house prices was one of the main catalysts for the government's weekend announcements about tightly ... More>>

BusinessDesk: How To Fall Foul Of The New Housing Tax Rules: Tips From IRD

Just because you rented out your investment property doesn't absolve you from paying tax, says the Inland Revenue Department in a summary of commonly made mistakes by non-professional property investors when it comes to their tax liability.More>>

Legal: Superdiversity Law, Policy And Business Stocktake Announced

Mai Chen, Managing Partner at Chen Palmer New Zealand Public and Employment Law Specialists and Adjunct Professor of Law at the University of Auckland, today announced the establishment ... More>>

Housing: More House Price Gains Expected

House price expectations remain high, with a net 56% of respondents expecting house prices will increase. Fears of higher interest rates are fading, consistent with the RBNZ’s signals this year. Affordability and a lack of houses for ... More>>

TDDA: State-Of-The-Art Drug Testing Laboratory To Open In Auckland

World leading drug testing agencies, The Drug Detection Agency (TDDA) and Omega Laboratories, open New Zealand laboratory More>>

Network: Bigpipe Launches Ultra-Fast Broadband Into Wellington

Bigpipe Launches Ultra-Fast Broadband into Wellington Naked broadband provider Bigpipe has extended its national reach, announcing today, the launch of its unlimited UFB offering into Wellington. The Spark Venture business is giving Wellingtonians the ... More>>

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news