Myth Busters

Here’s why industrial agriculture won't feed the world

By 2050, there will be several billion more mouths on our planet to feed. To keep up with the increasing demands of our growing population, we need an innovative and efficient agricultural system that is able to produce more with fewer resources.

When we talk about alternative food production systems, like agroforestry and holistic grazing, the first thing we usually hear is something along the lines of “yes, but that will never be enough to feed the world”. Behind this statement is the implicit idea that that industrialised agriculture, with it’s highly mechanised, large-scale monocultures and intensive use of synthetic chemical inputs, is the ‘most efficient’ way to produce our food. But, when you take a closer look, a very different picture emerges - one of an absurdly inefficient system that is verging on insanity.

What do we mean by ‘efficiency’?

It might be an obvious thing to say, but it’s important to point out firstly that the idea of agricultural ‘efficiency’ relies wholly on our definition of efficiency. ‘Efficiency’ in agriculture is, for the most part, focused almost exclusively on crop yields- but this excessive focus on yields ignores a whole host of other important factors that our crop production relies on.

Imagine, for example, you were only to focus on calorie intake as a measure for nutritional health of a human being. Eating pizza for every meal every day might then seem like a great idea - loads of calories, so this should make you really healthy! Right? Clearly, by eating pizza all the time, you could easily fulfil your caloric intake for the day but measuring health like this misses the bigger picture of nutritional health i.e. that humans also need a diverse variety of food types in their diet with a range of nutrients and vitamins essential for human health.

Similarly, in agriculture, by focussing on only yields as a measure of success, we’re missing the bigger picture of agricultural and ecosystem health. So what happens if we start to look at efficiency from other angles?

 Here’s a great diagram that we think demonstrates our point very succinctly- how conventional agriculture is a false economy of efficiency  © The Guardian (2016)

Here’s a great diagram that we think demonstrates our point very succinctly- how conventional agriculture is a false economy of efficiency  © The Guardian (2016)

Calories per hectare

A persistent argument in favour of industrialised agricultural practices is that it produces more food per hectare- but this doesn’t hold true. In fact, smallholder farms produce 70% of the worlds food on less than a quarter of all farmlands. How do they do it? By diversifying. Perhaps industrial farming produces more of one crop per hectare, but it cannot compete with a concentration of different crops on the same parcel of land. Imagine, for instance, you were to plant three crops; say, maize, beans and squash.

Three Sisters: Corn, Beans, Squash

To get three hectares of crops, you have the choice. Either you can mono-crop each crop and have one hectare of each across three hectares. Or, you could plant them all together- the beans climbing up the maize, the squash covering the floor and the maize growing up into the sky. You can therefore produce three hectares of each crop on only one hectare. This creates what is called an overyielding poyculture. This is the classic ‘three sisters’ growing method, but the same model of thought can be applied intelligently to all crops. In an agroforestry system, such as here at Mazi, that means trees combined with other crops underneath and between the tree lines, as well as animals that graze the grass underneath the canopies. In this way, you maximise on space, time (spent walking around checking the crops), calories produced per hectare and photosynthetic efficiency (i.e. maximising light, one of the major factors that plants need to grow the sugars, carbohydrates and other compounds we need for food).

Fossil fuel use

Every facet of industrial agriculture, from the production of the synthetic chemical inputs it relies on, to food processing and transportation, is rooted in cheap access to fossil fuels. As Joel Salatin puts it, we are the first culture in the world that has ever put an average of 1500 miles between producer and consumer. Whereas before, 1 calorie on the table took an average of ¼ of a calorie of energy to get there, today it takes 15 calories to produce 1 calorie of food energy.

This over-reliance on fossil fuels is a false economy, working only by borrowing from the future to produce for today, which makes our food system very unstable. When the day (inevitably) comes that access to fossil fuels is no longer cheap nor readily available, such as during the 1973 oil crisis, our whole agricultural system will be brought to its knees.

Regenerative practices, on the other hand, rely much less on fossil fuels and much more on renewable, non-polluting resources, which makes it both more resilient and more efficient in the long term.

Economic efficiency

When we take a more holistic approach to agricultural costs, it becomes obvious that conventional agriculture costs much more to society than agroecological farming. You actually pay three times for your food- once when you buy the food, once through your taxes which pay the agricultural subsidies needed to sustain this unsustainable type of production, and once to negate all the negative impacts that type of agriculture creates, ranging from the healthcare costs of farm workers exposed to pesticides, to de-polluting the water we drink. In France, for instance, the contribution of the agricultural sector to it's GDP is approximately 32 billion euros per year, whilst the cost of water treatment linked to agricultural pollution is estimated to be around 54 billions euros per year! And that is just for water pollution.

So, ultimately this means that agriculture as we currently do things costs us more as a society than it creates for us, which is economically absurd. We are destroying free processes, such as water and nutrient cycling, given to us by nature and we are instead investing in more and more complex and costly technologies to replace them.

Nutrient use

Here on Mazi, we like to say that we’re not culturing crops or trees, but that we’re culturing soil. Soil microbiology is the basis of the fertility of our ecosystems and therefore of our farms. The organisms in our soil play a vital role in synthesising and making nutrients available to our plants, storing and holding them until the plant needs them and then releasing them in a ready-made soluble form. Nutrients in conventional agriculture, on the other hand, are poured on by the tonne, and excess nutrients wash away, polluting our waterways and killing off marine life.

Microbiology also plays a huge role in disease suppression, irrigation (water movement through mycelial connections drastically increases water uptake in plants) and soil aggregation (meaning less soil erosion). Furthermore, it creates a healthy environment in which plants can pick and choose nutrients as they need, which puts the plants back in control - and who understands plants needs better than plants? This means as farmers we don’t have to waste time and energy micromanaging every need of the plant. So what do we do in conventional agriculture? Pour fungicides and pesticides on our fields to destroy microbial life in the soil. Nice!

And, for the sake of it, let’s actually look at the dominant way efficiency is understood in agriculture...

Yield per hectare

It is often argued that despite the gains in efficiency elsewhere in the system, the fact that organic production produces less is still a barrier in a world where we are told we need to produce more food. But on closer inspection, this gap between crop yields may not be all it seems.

The most extensive meta-analysis studying comparative yields to date did indeed report that, compared to conventional farms, organic production produced on average 20% less yields, echoing the ideas of previous studies. However, the report then goes onto consider this gap in more detail, breaking down the binary categories of conventional vs. organic and instead focusing attention on organic farms that practised cover-cropping, carefully managed rotations of crops and focused on building soil health - i.e. a more regenerative approach to organic farming. When weighing these factors into the equation, that gap of 20% halved to only 10%. The authors concluded that this gap may actually be even smaller due to bias in the data.  

Furthermore, nearly a third of all the food we produce goes straight in the bin. This means that the gap in production yields between conventional agriculture (both industrial and organic) compared with regenerative agriculture is actually less than the amount of food we throw away each year! Which really puts the concerns of yield loss into perspective.

As always, thanks for reading! Stay tuned for more agricultural musings,

Tash



 

To till or not to till?

Why do we till? Tilling for many people is synonymous with the way we practice agriculture nowadays. If I asked you to picture an agricultural scene, chances are you've probably pictured a big tractor hauling something metal and heavy through a field.

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There are countless things we do by rota everyday, without really taking a moment to think about why or how we're doing them, just because everyone else is and it seems like the done thing to do. The question is – could tilling be one of those things? Could something that is so emblematic of farming actually not be the best way of doing things, or – worse- could it even be harmful?

Why till?

Tilling, in one form or another, has been practiced for millennia, with forms of tilling even being documented since ancient Egyptian times.  As with all agricultural practices, tilling has gone through centuries of technological developments, moving from using simple hand-held tools and animals drawn ploughs, to the hefty high tech tractors we see today. These developments have allowed us to work the soil harder, longer, deeper and much more efficiently.

There's many good reasons why tilling at first seems like a great idea, which is why it gained such traction in agriculture in the first place. Initially, it was thought that by grinding up the soil into finer particulates, tilling made nutrients more easily accessible to the plant. And, at first glance, all seems well. Soil after tilling is fluffy and clean, plants are easily planted and seem to thrive in their new homes. But after time and on closer inspection, things aren't all rosy in the gardens after you till...


Why did the fungi leave the soil?

Because there wasn't 'mush-room'!.... Or was it because of tilling?

Tilling is a philosophy grounded predominantly in the idea that soil is mainly just a physical and chemical substrate. However, it does not take into account the biology that underlines the functioning of healthy soil. And the idea of no-till farming is largely due to exactly that biology- namely, an invisible ally called 'fungal mycelium', of which you can find literally miles and miles in just a spoonful of healthy soil.

This mycelium works in a multitude of ways to help plants, and therefore farmers, out. It helps unlock natural nutrients, rebuilds soil structure, aerates the soil and exponentially increases the water retention of the soil. Crucially, certain kinds of beneficial fungi make what is known as 'symbiotic relationships' with plant roots. Through these associations, fungi exchange carbohydrates and minerals for simple sugars produced by the plant and exuded through their root systems. In this way, fungal mycelium help to nourish plants. Mycelium has also been shown to play a crucial role in the transfer of water to plants, as well as other molecules such as enzymes in response to problems. In this way, ferrying nutrients, water and information, mycelium acts as the neural network, or, as Paul Stamets puts it, the 'internet' of the soil. However, tilling breaks up the long strands of fungal filaments, destroying the helpful mycelium and all the benefits along with it.

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Tilling practices also kill off other kinds of crucial soil microbiology. For example, tilling kills earthworms who play a crucial role in soil health, through aerating the soil with their burrows and digesting soil which creates nutritious humus. 

Furthermore, tilling, by turning and mixing the soil, breaks up all natural layering of the soil pulling finer soils up to the surface of the soil leaving it vulnerable to erosion, which washes away all the crucial nutrients we need for our plants to grow. This also works to compact the soil, which creates the anaerobic conditions in which plant pathogens thrive. The turning and exposing of soil also leaves it vulnerable to water being lost through evaporation which, especially in a Mediterranean context like Greece, is the last thing you want to see with such a scarce and important resource.

The reality of implementing no-till

It's not always easy to put ideology into action. No-till techniques require patience and it's clear that after centuries of working our soils, things won't happen overnight- instead, we have to rely on the old adage that 'good things come to those who wait'! Furthermore, no-till as a technique poses many technical challenges, from designing new affordable technologies such as no-dig seeders to building up biological knowledge of our soils. Clearly a lot of work is required to design new innovative approaches and techniques that allow farms to be run efficiently without the use of tilling.

However, we have taken inspiration from many encouraging studies that have emerged throughout the past few years, showing numerous benefits from practicing no-till agriculture. For instance, researchers from a 21 year study in Germany reported that implementing these practices slashed energy inputs by between half and two-thirds, drastically reduced pesticide and fertiliser inputs, increased biodiversity levels and improved water retention.

To begin our no-till experience, we have been hard at work here at Mazi creating a no-till vegetable garden, through the layering of our soil with manure, cardboard and woodchips, which will be added to year on year. We are also working to extend this philosophy across all of our land, implementing strategies help to rebuild and repair our degraded soils and experimenting techniques to help us run our farm without the help of a plough. We're excited to see how our soil quality will change over time and to share our progress with you as our project develops.

As always, thanks for reading our blog – we really appreciate the 'morel' support!

Tash