Tag Archives: agriculture

U.S. topsoil

A study published in Nature says the U.S. “corn belt” has lost something like 35% of its topsoil. Sounds concerning, and I have heard dramatic claims like “the world only has 50 years of topsoil left. I also just find it sad to think that the topsoil was built up by the prairies over the millennia, and we have mined much of it into oblivion in a few short industrial generations. But this article also puts the loss in terms of crop yields at around 6%, which doesn’t sound so dramatic. This makes me think we are relying largely on agricultural chemicals rather than nutrients in the soil itself. Maybe it would actually make more sense to intensify industrial agricultural in some areas or even indoors, contain the impacts, and restore some of those prairies.

a new dust bowl

Sure, the U.S. has problems, and we are not doing a great job solving or even acknowledging all of them. Still, soil conservation is something we have had figured out since the 1920s, right? Not so fast, my friends. As we keep pushing for increased production, the amount of dust in the air (this is something we measure) keeps increasing. Warming and drying trends are not going to help.

This is Geophysical Research Letters.

Climate change and land use are altering the landscape of the U.S. Great Plains, producing increases in windblown dust. These increases are investigated by combining coarse mode aerosol observations from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor in addition to the Aerosol Robotic Network (AERONET) and Interagency Monitoring of Protected Visual Environments (IMPROVE) aerosol monitoring networks. Increasing trends of up to 5%/year in MODIS aerosol optical depth for dust observations are observed throughout the Great Plains (2000–2018). Cropland coverage has increased 5–10% over the majority of the Great Plains (2008–2018), and positive monthly trends in IMPROVE (1988–2018) and AERONET (1995–2018) coarse mode 90th percentile observations coincide with planting and harvesting seasons of predominant crops. Presently, results suggest increased dust due to agricultural expansion is negatively influencing human health and visibility in the Great Plains. Furthermore, results foreshadow a future where desertification becomes an increasing risk in the Great Plains.

carbon sequestration potential of restoring degraded land

The UN Convention to Combat Desertification says there is a large and potentially very cost-effective opportunity to sequester a lot of carbon by restoring degraded farmland. This is not planting trees or trying to green areas that were historically desert, but trying to restore areas that used to be productive cropland or grazing land to their original condition or better. It’s also an opportunity to expand food production without displacing productive natural ecosystems.

Rene Castro Salazar, an assistant director general at the UN Food and Agriculture Organization, said that of the 2 billion hectares (almost 5 billion acres) of land around the world that has been degraded by misuse, overgrazing, deforestation and other largely human factors, 900 million hectares could be restored.

Returning that land to pasture, food crops or trees would convert enough carbon into biomass to stabilize emissions of CO2, the biggest greenhouse gas, for 15-20 years, giving the world time to adopt carbon-neutral technologies…

Key to returning dry lands to vegetation is the use of fertilizer, said Mansur. “Fertilizers are essential for increasing productivity. Good fertilizer in the right quantity is very good for the soil.”

Time

geoengineering and rice yields

Would injecting sulfate particles into the atmosphere to counteract global warming affect rice yields in the tropics? Yes, according to this paper, but not in the direction I guessed. Even though rice is a tropical crop, it is sensitive to temperature – higher temperatures decrease its yield, and the effect of lowering temperature would be greater than the effect of having less light, leading to increased yield. At least in this study which wired together a complicated climate model with a complicated rice yield model.

farm robots

Farm machinery is getting more high-tech and more automated all the time, due in part ot climate change.

Technological improvements from boosting crop yields to data-tracking systems will be required in coming decades as companies adapt to shifts in weather patterns, according to BMI Research. That may increasingly push agribusiness companies, especially grain handlers and input firms, into acquiring agritech startups.

“The rise of agtech use and ‘precision agriculture’ will benefit or disrupt a number of operations and businesses in the process,” the company said in a report Tuesday.

Farmers and businesses around the world are poised to feel the impact of climate change as supplies get disrupted and farmland and yields come under pressure. At the same time, agriculture, one of the largest sources of gas emissions, will face action from regulators targeting livestock and soil management.

 

organic farming and soil fertility

This study in Ecological Economics looked at the effects of organic vs. conventional farming and owner vs. tenant farmers on soil biochemical activity. To paraphrase and oversimplify, what they found is that owners take better care of the soil than tenants, but organic farming methods can offset this effect so that the soil remains active under either type of farmer. I also found it interesting to hear how scientists use enzymes to measure the health of soil, which is a living system after all.

Various effects of land tenure on soil biochemical parameters under organic and conventional farming − Implications for soil quality restoration

Land tenure insecurity is one of the worldwide problems that often leads to soil degradation. We tested whether owner-operators maintain a higher level of soil quality and biochemical activity than tenant-operators and how this effect is modified by the agricultural system (organic vs. conventional) in arable fields. We selected 45 plots with cambisol soil based on a factorial design of owner-operator vs. tenant-operator and organic vs. conventional management. On all tested plots, the crop was wheat in shortly after harvest. We measured total carbon in soil and a set of 8 soil enzymes: acid phosphatase, β-glucosidase, α-glucosidase, cellobiohydrolase, β-xylosidase, chitinase, glucuronidase and arylsulfatase. These enzymes participate in the main geochemical nutrient cycles in soils.

Differences in the activity of 4 out of these 8 enzymes and differences in the weighted means of the total enzyme activity show a joint effect and indicated higher biochemical activity of the soil under conventional farming in plots farmed by owners. However, when organic farming was practiced, no obvious differences in enzymatic activity were found between soils farmed by owners or by tenants. The total carbon showed a similar pattern, although not significant.

Generally, we conclude that farmer’s motivation for making investments in soil health is driven by tenure security, especially in cases where the farm economy depends on profit from crop yields. However, the positive features of tenure security can also be ensured by effective agroecological standards, strict rules, higher levels of subsidies and other incentives that are typically provided for organic farming. We propose that changes in agricultural policies may not only stop land degradation in various parts of the world but also support ecosystem restoration process.

I think research on organic farming is crucial. (And no, “organic” is not the perfect word to describe it, but everybody knows what it means so it works.) If we are going to feed 10 billion or more people, we have to get more food from the same land because there is not going to be a whole lot more farm land opening up on this planet. In the past, we have done exactly this by dumping fossil fertilizer and irrigation water on our crops. This may continue to work for awhile, but it doesn’t seem sustainable for a number of reasons, ranging from overpumping of groundwater to loss of glaciers and snowpack we have relied on to nutrient pollution of our coastal waters to desertification to collapse of fisheries, all at the same time the population is not only growing but each individual’s impact is growing. If we can find ways to actually improve the land and soil over time, without causing pollution downstream, and without losing yield, that would be ideal.

food security in Asia and the Pacific

This 2013 report from the Asian Development Bank has some eye-popping statistics.

Trends in population, economic growth, industrialization, urbanization, and changing dietary patterns have largely encumbered already scarce natural resources. Total arable land per person in East and South Asia has been shrinking, falling from almost one-quarter hectare per person 50 years ago to an estimated one-tenth hectare by 2050. Water resources are also strained. Across Asia, between 60% and 90% of water is used for agriculture. However, share of household and industrial water consumption almost doubled during 1992–2002. The region would need an additional 2.4 billion cubic meters of water each day to provide each consumer with 1,800 calories per day by 2050. The growth in yields has been declining in Asia. And the projected impact of climate change will significantly affect soil and water resources in many subregions.

Expanding cultivated lands is no longer an option for food production growth in nearly all countries in Asia and the Pacifi c. Although most arable land is accounted for, there remains considerable room to increase crop yields even with currently available resources and existing technologies—provided appropriate market incentives and public support mechanisms are in place. Agricultural output and productivity can be raised in two broad ways: (i) through improved productivity at the farm level, and (ii) through better postharvest productivity. In South and Southeast Asia, about one-third of food production is lost as it travels through the supply chain.

During my brief time living in Asia and working on urban development and water resources projects, I started to have a sense that the sheer scale of human activity in Asia is such that it will determine our civilization’s future. What we do here in the United States or the western hemisphere more generally is less consequential, simply because we don’t have the scale of population, agricultural and industrial production, consumption, and more importantly, exponential growth of all these things that Asia is experiencing.

I am not an expert on agriculture, so it is easy for me to sit here and opine on organic farming and sustainable agriculture. Feeding people by the billions is a serious business where any missteps have unacceptable consequences, and so far a combination of irrigation, fossil-fuel derived fertilizer, massive surface water diversion and groundwater mining has largely managed to do that, although the poor sometimes get left behind. In the short term I don’t think we want to disrupt this system. But we better give some serious thought to whether it is sustainable (in the dictionary sense) in the face of exponential population and consumption growth. If not, the scale of human misery that will result could be truly awful.

So I would look for incremental improvements to farming practices that increase sustainability and reduce long-term risk without decreasing output. Soil and water conservation seem like a good place to start to me. If your farming practices are building the amount and fertility of the soil from year to year without causing water scarcity or pollution, that is a good clue that you may be doing something sustainable.

peak bacon?

This headline in USA Today says Nation’s bacon reserves hit 50-year low as prices rise. That pretty much covers it. The reason is not lack of supply but increased foreign demand.

In December 2016, frozen pork belly inventory totaled 17.8 million pounds, the lowest level since 1957, according to the U.S. Department of Agriculture.

As a result, prices are on the rise. The council reports pork belly prices have increased 20 percent in January. Officials said increased foreign demand might account for the decline in inventory. Hog farmers export approximately 26 percent of total productions, the council said.

free trade and big ag

When I think of the controversial side of trade, I tend to think of manufactured goods being produced cheaply abroad and imported to the U.S. But there is also a huge global trade in food and agriculture, and the U.S. is a huge player in it, both in exports and imports. It is not only big business but big politics too. This industry has lobbied heavily for trade deals like NAFTA and TPP. This Mother Jones article has a lot of interesting facts and figures. Okay, maybe Mother Jones is not a completely apolitical non-partisan voice, but this article has a lot of links you can follow up on if you want to draw your own conclusions from the raw data.

It’s interesting, we have a nominally business-friendly administration elected by voters in rural states that seems hostile to the priorities of politicians bought and paid for by the biggest and most powerful business lobby in those same rural states.