Showing posts with label Nitrogen. Show all posts
Showing posts with label Nitrogen. Show all posts

Tuesday, April 10, 2012

We Are Running out of Miracles


You may not have noticed. Today we do not treat medical infections the way we treated those twenty years ago. I recently accompanied a friend to the emergency room at the hospital. It turned out he had a serious infection. Twenty years ago, he would have been given an injection of antibiotic, a prescription of oral antibiotic and sent home. Not today!  He immediately got a dose of antibiotic intravenously, and then needed to come back to the hospital two times a day for the next several days for further intravenous antibiotic.

This, my medical friends tell me, is because of antibiotic resistant bacteria. I am not old enough to remember infections before antibiotics, but I am old enough to remember the first generation of antibiotic: Penicillin. Penicillin was followed by second, third and fourth generation antibiotics. Now, it seems, the only way antibiotic is sufficiently effective is if it is administered intravenously. And once that no longer works, what is the next step?

This should surprise no one. Natural selection decrees that this will occur. The bacteria resistant to an antibiotic survive and reproduce.

Had we known then, when penicillin was first discovered and available to doctors, what we know now, would we have used these wonder drugs in the way we have? For example, would we have allowed their use in animal feed? We have a problem.

Within our food production system, we face a similar situation. Conventional food production conveniently disregards nature’s cycles.

Within nature, there are many natural cycles. The ones we understand best are the carbon cycle, the nitrogen cycle and the phosphate cycle. In each case the plant, as it is growing, take up elements from the soil and air, converting them into plant tissue. The plant dies and the elements return to the soil and air. Some plant tissue is eaten by animals, but as the animals defecate and die, the cycle is still completed.

But our conventional food production system does not recognize these cycles. Instead, the science behind our conventional food system recognizes that plants need phosphate and nitrogen to thrive. Science has found a way of converting natural gas into nitrogen fertilizer. The plant response to this fertilizer is phenomenal. The natural nitrogen cycle, it seems, is no longer pertinent.

In the same way, conventional science has found that phosphate, mined at Kapaskasing, can be converted to fertilizer. Again, the plant response to this fertilizer is exceptional.

But there are problems with this food system. First, the supply of both, natural gas and phosphate rock is in limited. Already we have used up the most accessible supplies of both resources. Secondly, when the plant tissue we consume is “used up”, the “waste” consists of the nitrogen and phosphate. Nature says that needs to go back to the soil to feed future generations of plants. But it does not. Instead, it becomes a pollutant. Much of it ends up in Lake Winnipeg.

Fortunately, for food production, there is an alternative, at least a partial one. While scientists and farmers within the conventional food production stream have been looking for ways of increasing the plant response to chemical nitrogen and phosphate, a much smaller group of scientists and farmers have been looking at an alternative, a way of enhancing food production within the natural cycles. They call themselves organic producers. As we remove our conventional blinders and become more aware of what these scientists and farmers have discovered, what we find is truly impressive.

By Eric Rempel

Tuesday, July 26, 2011

Natural Systems Agriculture

Last week I attended the annual field day of the Natural Systems Agriculture program of the University of Manitoba. I was again impressed with the important work these people are doing, and the importance of agricultural research to our lives.

Had average crop yields remained at the 1900 level the crop harvest in the year 2000 would have required nearly four times more land. Since 1900, Canadian and US crop yields have more than tripled. In France, yields have increased by a multiple of 5.2 and in China by a multiple of 3.8. Primarily, three technologies made this yield increase possible: the development of synthetic nitrogen fertilizer, the development of pest control chemicals and the breeding of plant varieties that responded to these ideal conditions.

In 1900, agriculture used no synthetic nitrogen fertilizer. Today’s agriculture, today’s food production, is utterly dependent on it. Without synthetic nitrogen, modern agriculture would collapse. The development of synthetic nitrogen is an monumental achievement on the one hand, but on the other, it creates a disquieting vulnerability. Ironically, virtually all agricultural research today is directed either towards achieving higher yields while optimizing nitrogen or towards increasing the efficiency of the use of nitrogen. The perpetual availability of synthetic nitrogen is assumed.

But all synthetic nitrogen manufactured today comes from natural gas, a resource in limited supply.

The only alternative to synthetic nitrogen derived from natural gas is natural nitrogen. We know of no alternative source of synthetic nitrogen. This is why the work done by the Natural Systems Agriculture program, a program run by a small group of researchers is so important.

What impressed me most at this field day is that these Natural Systems Agriculture people are not doing things the way my father (who was a farmer) did things prior to the availability of synthetic nitrogen and chemical pest control products. Through the judicious use of plants that fix atmospheric nitrogen and return biomass to the soil, they have been able to achieve yields that come very close to the yields achieved by what is currently seen as conventional agriculture.

At the field day, these researchers demonstrated that:
  • Soil nitrogen levels can be maintained with nitrogen fixing plants in the rotation. Yields following a nitrogen-fixing crop typically approach yields of crops fed synthetic nitrogen.
  • Tillage and the use of weed control chemicals have been over-rated as weed control tools. By using equipment designed to plant into untilled ground and by maintaining a good mulch, weeds are not eliminated, but can be controlled.
  • Careful crop rotation is needed to maintain field fertility and control weeds.

As is typical at field days of this nature, the various donors that made this work possible were acknowledged. These included various government funding programs and assorted farmer and consumer organizations. Notably absent from the list of donors were the big agribusiness companies. Yet it is these companies that are responsible for most of the agricultural research done today, either by supporting work at the University or by carrying it out themselves.

Low input agriculture may not be important to the large corporations of this world, but it is vitally important to the people who depend on a healthy environment for survival.

Eric Rempel