Category Archives: water

Organic Tomato Farm’s Soils Produce High Yields During Terrible Drought

Today’s post is reprinted by permission of Charles M. “Chuck” Benbrook, who is a research professor at the Center for Sustaining Agriculture and Natural Resources at Washington State University.

Long-time readers of this site know that healthy organic soils retain moisture far better during drought-stressed conditions. Today’s post offers a pretty profound example of that principle in action this past summer during California’s drought.

Charles Benbrook reports about an organic tomato farm in California and its amazing success even during last summer’s terrible drought. The numbers he includes in this article of tomato yields and rainfall are astounding in a positive good-news way for producers of every kind, everywhere. He attributes this tomato production “miracle” to the organic soil health of the long-standing farm. (Although, I suspect because it is “Northern California-coastal” it is also receiving some moisture in the way of fogs.) Then, he warns growers that if they wish to be resilient in future weather-stresses expected from climate change, they need to establish similar soils in their own growing fields.

It’s a win-win.

Better tasting tomatoes, lower input costs, and crop resiliency.

It is better to let Nature do the work for us, instead of destroying the natural systems and then repairing the damage to get the yields we’re after.
—Kay M.

Promoting Global Food Security One Crop of Tomatoes at a Time

By Chuck Benbrook

In early September I visited a remarkable organic farm on the coast of California. This farm has been in organic production for about 30 years, and its harvests of mostly organic tomatoes have been marketed through a variety of outlets in Northern California.

I arrived on the day picking had just begun on a sloping tomato field about 6 acres in size. The crop was exceptionally clean, with virtually no insect damage and few weeds. Minimal, organically approved control measures had been used, including applications of sulfur and releases of trichogramma (beneficial wasps), along with many hours of hand weeding.

One of every dozen-plus fruits had minor, cosmetic blemishing on the skin, typically where the tomatoes contacted the soil. Otherwise, the tomatoes were picture perfect. I can also vouch for their organoleptic quality, from a first-hand eating experience at a dinner during my stay. These tomatoes also, no doubt, contain markedly higher levels of health-promoting phenolic acids and Vitamin C, for reasons discussed in an earlier blog (“A Tale of Two Tomatoes,” February 23, 2013).

The grower has since reported that the field produced about 30,000 pounds of tomatoes per acre.

Farmers in other tomato-producing regions often produce substantially more per acre.  My friend and colleague Madeline Mellinger runs Glades Crop Care (GCC), South Florida’s major independent crop consulting firm.  She and the GCC staff scout and advise farmers on pest management across about 11,000 acres of tomatoes each year.  In their neck of the woods, conventionally grown tomato yields average 50,000 pounds per acre, and in all but unusual years, range from 35,000 to 65,000 pounds/acre. Yields of 60,000 pounds per acre are common.

So what’s the big deal about a 30,000 pound per acre organic tomato yield in sunny California, when Florida (and some other California) growers often produce twice that per acre?

This was a dryland field of organic tomatoes – no, none, zero supplemental irrigation had been applied.  The field was planted in April.  Detailed weather data is accessible from a nearby weather station, which I accessed upon return to my office.

On August 6th and 7th, the last measurable rainfall had fallen in the area (0.02 inches, or two one-hundredths of an inch, i.e. almost none).  July rainfall totaled 0.16 inch, and 0.04 inch fell in both May and June. A far-below average 0.45 inch fell in April, and only 1.12 inches came in March, usually one of the year’s wettest months.

Total precipitation for the 2014 production season was 1.83 inches.  On California’s irrigated fresh market tomato fields, around 30” of irrigation water is applied to bring a crop to market, and according to the USDA, average yields are about 35,000 pounds per acre.

Organic production + 1.83 inches of rainfall = 30,000 pounds of tomatoes.

Conventional production + 30 inches of irrigation water = 35,000 pounds of tomatoes.

If a drought-weary California is forced to look for new ways to conserve water, the performance of this organic farm is both impressive and hopeful, given that it produced over 16,000 pounds of tomatoes per inch of rainfall.  On a typical, irrigated, fresh market tomato field in California, experienced growers harvest about 1,200 pounds of tomatoes per inch of irrigation water, and somewhat less than 1,000 pounds per inch of rainfall-plus-irrigation water.

How could 30,000 pounds of tomatoes per acre be harvested on a field receiving so little rainfall?

It’s all about the soil. Over the last 30-plus years, this field has been in a complex rotation, with ample amounts of added organic material and routine cover cropping. The organic matter content of the soil has been increased about two-fold – from around 1.5% to about 3% — promoting rapid water infiltration (when it rains), as well as enhancing the soil’s water holding capacity.

So what does this un-irrigated, organic tomato field have to do with feeding the world?

Governments around the world are urging people to increase consumption of fruits and vegetables to at least four servings per day (the USDA recommendation is 5-8 servings/day). The population of California is currently 38 million, so each and everyday, the good citizens of the State should be consuming at least 152,000,000 servings of fruits and vegetables.  Surely, mankind does not live by tomatoes alone, but for the sake of making an important point, bear with me.

According to the USDA, one serving of fresh tomatoes weighs 90 grams, or 0.19842 pound (i.e., there are about five servings in one pound of tomatoes).  Accordingly, 1,005 acres of similarly managed, organic tomatoes yielding, on average, 30,000 pounds per acre, would produce enough tomatoes to feed 38 million Californians four servings of this vegetable for one day.  Year-round, at the same yield level, only 366,943 acres would be needed to assure 38 million Californians get their four servings of fruits and vegetables a day.

The surface area of California is about 101 million acres, of which about 30 million acres are classified as farmland.  About 6 million acres in California are regarded as “prime” farmland. Over 500,000 acres of California land are planted to cotton most years, and another 1.5 million produce hay.  Clearly, finding 366,943 acres to produce enough fruits and vegetables (F+Vs) for all Californians should not be a major problem, at least not for a very long time.

For 314 million Americans, and the 7 billion on Planet Earth, less than 3% of available, high quality agricultural land would be required to assure production of at least four servings of F+Vs a day, per capita, year round.

Doing so, and getting the tomatoes, citrus, berries, and potatoes to the people who need them, including the poor, remains an enormous challenge, but not because of land shortages, lower yields on organic farms, or even persistent drought. In years when drought, or too much rain and flooding, or an untimely freeze, reduces fruit and vegetable production in one region, other areas can pick up at least some of the slack.  And through new methods to preserve and store F+Vs, the nation could (and probably will someday) create a strategic F+V reserve.

As climate change and severe drought become more commonplace, the importance of building soil quality as a hedge against catastrophic crop failure will grow.  Experience and insights gained on long-term, well-managed organic farms will provide a benchmark of what can be accomplished and how healthier, richer soil can serve as a buffer against climate extremes. And this will promote global food security, one field at a time.

Photo via FlickrCC Mr.TinDC.

What IF We Have Fusion Ten Years From Now? Here are 12 Possibilities.

Nuclear fusion has always been the dream of scientists as an ideal energy source, but has so far been elusive after many decades of work. However, two days ago, Lockheed Martin reported that it would have successful nuclear fusion available in a small-sized unit platform about ten years from now.


Skunk Works Compact Fusion Site at Lockheed Martin
Reuters Article on Scientific American: Lockheed Claims Breakthrough on Fusion Energy
Forbes: Lockheed Martin Claims Fusion Breakthrough That Could Change World Forever

If this is true it will change the world as we know it. On the other hand, claims of fusion have always existed somewhere off in the distant future. Is this time any different? We don’t know, but it’s worth considering how it could change the world if this announcement becomes the real deal.

Here are twelve likelihood’s.

1. Desalinated water would become cheap. The deserts of the world could become the farm regions for the world – if located near the sea. Warm regions could grow food year-round. Water woes would be mostly forgotten about and more people could locate in climates which are desirable but currently restricted by water supply. California’s water woes would be gone. So would the Middle East’s.

2. This would be a totally disruptive technology. We would no longer need the grid and would instead have distributed power. Transportation would go fuel cell, electric, and hybrid. We’d have much less need for today’s fossil fuels such as oil, coal, and natural gas and could greatly reduce human induced CO2 emissions. We wouldn’t need wind generators, either. Some solar photovoltaic might still be useful. Buildings which are heated with natural gas could be heated with electricity instead. Air conditioning and refrigeration would become cheap.

3. There would be no need for biofuels. Ships would be powered with fusion units. There is speculation that we could have unlimited flight time for airplanes, too.

4. Regions which are currently being farmed could be returned to the wild.

5. Urbanization could continue with much greater confidence. Today’s ideas of city greenhouses and hydroponic growing centers would be far more feasible with cheap available water and energy, especially along the coastlines.

6. Farms would continue to industrialize, but in modern technical ways, as opposed to today’s political-corporate ways. Tractors and combines would be powered by fuel cells. Fusion could be the energy source for producing nitrogen fertilizer.

7. Most of the developing world could advance far more rapidly if fusion becomes available. Computers, robots and technology would continue to advance at an unprecedented pace. Medical advances and longevity advances would be included.

8. Leisure time for humans would become a greater reality. Some economists already believe that it will become necessary to pay people to “exist” because jobs are not available as we become more efficient, as we use more and more robots, and as computers and communications continue to eliminate jobs. We’d need even fewer people to produce food and basic goods. New models would be needed which would pay people to be artists and service workers and other types of meaningful contributors to society. Economies should do well if cheap energy is available reliably since expensive energy is akin to a tax on industrialized nations, though they’d need to adjust to this disruption.

9. Population would continue to grow and grow with fewer limits to growth. Would we finally have the political will to place a value on the natural world and on biodiversity? Would pollution become our greatest problem, then, or could fusion help us to get rid of pollution? Perhaps it could.

10. We wouldn’t need hydropower anymore, so rivers could be undammed.

11. Perhaps every region or nation could become food secure.

12. Increased globalization: The world would become even smaller. So might the Universe. There would be a greater chance for peace. So be it.

What DO YOU think would happen?

Photo credit: Lockheed Martin.