- Conservation agriculture
Conservation agriculture can best be defined by the statement giving out by the FAO (
Food and Agricultural Organizationof the United Nations) “CA is a concept for resource-saving agricultural crop production that strives to achieve acceptable profits together with high and sustained production levels while concurrently conserving the environment” (FAO 2007). With conservation agriculture (CA) there are two important elements that come with this process, two products that would seem unlikely put together. Agriculture and Conservation are two elements that seem unlikely but can coexist with each other. Agriculture according to the New Standard Encyclopedia is “one of the most important sectors in the economies of most nations” (New Standard 1992). At the same time conservation is the use of resources in a manner that safely maintains a resource that can be used by humans. Conservation has become critical on the fact that the world population has increased over the years and more food needs to be produced every year (New Standard 1992).
Key Principles of Conservation Agriculture
The FAO or Food and Agricultural Organization of the United Nations have determined that CA has three key principles that producers (farmers) can proceed through in order to do the process of CA. These three principles outline what conservationists and producers believe can be done to conserve what we use for a longer period of time.
The first key principle in CA is practicing minimum mechanical soil disturbance which is essential to maintaining minerals within the soil, stopping erosion, and preventing water loss from occurring within the soil. In the past agriculture has looked at soil tillage as a main process in the introduction of new crops to an area. It was believed that tilling the soil would increase fertility with in the soil through mineralization that takes place in the soil. Also tilling of soil can cause severe erosion and crusting of soils which will lead to a decrease in soil fertility. Today tillage is seen as a way as destroying organic matter that can be provided within the soil cover. No-till farming has caught on as a process that can save soils organic levels for a longer period of time, and still allow the soil to be productive for longer periods of time (FAO 2007). Also with the process of tilling comes the time and labor for producing that crop. If no-till practices were being done then the producer would see a reduction in production cost for a certain crop because they no longer are tilling the ground. Tillage of the ground would require the farmer more money due to the fact of fuel for tractors or feed for the animals pulling the plough in order to till the ground. Also the producer would see a reduction in labor; this would be because the producer does not have to be in the fields as long as they would if he/she was a conventional farmer.
The second key principle in CA is much like the first principle in dealing with protecting the soil. The principle of managing the top soil to create a permanent organic soil cover can allow for growth of organisms within the soil structure. This growth will break down the mulch that is left on the soil surface. The breaking down of this mulch will produce a high organic matter level which will act as a fertilizer for the soil surface. If the practices of CA were being done for many years and enough organic matter was being built up at the surface, then a layer of mulch would start to form. This layer would help in preventing soil erosion from taking place and ruining the soils profile or layout. In the article “The role of conservation agriculture and sustainable agriculture” the layer of mulch that is built up over time will start to become like a buffer zone between soil and mulch that will help reduce wind and water erosion. Also, with this, comes the protection of a soils surface when rain is in the process of falling to the ground. Rainfall on land that is not protected by a layer of mulch is left open to the elements of being impacted directly by the rain. But when soils are covered under a layer of mulch, the ground is protected in a way so that the ground is not directly impacted by rainfall (Hobbs et al. 2007). This type of ground cover would also help in keeping both the temperature and moisture levels of the soil at a higher level rather than if it was tilled every year (FAO 2007).
The third and final principle that is exercised by the FAO is the practice of crop rotation with more than two crop species. According to an article published in the Physiological Transactions of the Royal Society called “The role of conservation agriculture and sustainable agriculture” crop rotation can be used best as a “disease control” against other preferred crops (Hobbs et al. 2007). This process will not allow pests such as insects and weeds to be set into a rotation with specific crops. Rotational crops will act as a natural insecticide and herbicide against specific crops. Not allowing insects or weeds to establish a pattern within fields will help to eliminate problems with yield reduction and infestations within fields (FAO 2007). Crop rotation can also help build up a soils infrastructure. Establishing crops in a rotation allows for an extensive build up of rooting zones which will allow for better water infiltration (Hobbs et al. 2007).
In Conservation Agriculture there are many examples that can be looked towards as a way of farming but at the same time conserving. These practices that are done now are known well by most producers. The process of no-till is one that follows the first principle of CA, with doing minimal mechanical soil disturbance. But no-till also brings other benefits to the producer who does no-till. According to the FAO tillage is one of the most “energy consuming” processes that can be done, in other words it takes a lot of labor, time, and fuel to do the process of tillage. Producers can save 30% to 40% of time and labor by practicing the no-till process. (FAO 2007)
Besides conserving the soil, there are also other examples of how CA is used in the world today. According to an article in Science called “Farming and the Fate of Wild Nature” there are also two more kinds of CA that can be used. The practice of Wildlife-Friendly Farming and Land Sparing are ideas that can be used if a producer is looking to be more conservative towards biodiversity (Green, et al. 2005).
The idea of Wildlife-Friendly Farming is a practice of setting aside land that will not be developed by the producer (farmer). This land will be set aside so that biodiversity has a chance to establish itself within areas along with agricultural fields. At the same time inside the fields the producer is taking attempts to lower the amount of fertilizer and pesticides used within the fields so that organisms and microbial activity have a chance to establish themselves in the soil and habitat as a whole (Green, et al. 2005). But as in all systems, not all can be perfect. In order to create a habitat suitable for biodiversity something has to be reduced, and as in this case for agriculture farmers, yields can be reduced in the process. This is where the second idea of Land Sparing can be looked on as another alternative.
The idea of Land Sparing can be used as another way that both producer and conservationist can both be on the same page. Land Sparing brings in the point that for all the land that is being used for agricultural purposes be continued to produce food and products for our world but at an increase in yield. With an increase in yield on all land that is presently in use then some other land can be set aside for conservation and production for biodiversity. This would mean that land in agriculture would stay in production but would have to increase its yield potential in order to keep up with the demand for food worldwide. Other land that is not being put into agriculture use would be used for conserving biodiversity (Green, et al. 2005).
In the field of CA there are many benefits that both the producer and conservationist can obtain in doing this practice. If there were no benefits from this practice then there would be no reason for anyone to ever do it. Conservationist and producers and/or farmers have both separate and yet the same benefits that they get out of CA.
On the side of the conservationist CA can be seen as beneficial because there is an effort to conserve what people use on earth everyday. Since agriculture is one of the most destructive forces against biodiversity, CA can change the way humans produce food and energy for our daily lives. With conservation come environmental benefits of CA. These benefits include less erosion possibilities, better water conservation, improvement in air quality due to less emission being produced, and a chance for larger biodiversity in a given area.
On the side of the producer and/or farmer CA can eventually do all that is done in conventional agriculture but it can conserve better than conventional agriculture. CA according to Theodor Friedrich, who is a specialist in CA, believes “Farmers like it because it gives them a means of conserving, improving and making more efficient use of their natural resources"( FAO 2006). Producers will find that the benefits of CA will come later rather than sooner. Since CA takes time to build up enough organic matter and have soils become their own fertilizer than the process does not start to work over night. But if producers make it through the first few years of production, then results will start to become more satisfactory. CA is shown to have even higher yields and higher outputs than conventional agriculture once CA has been establish over long periods of time. Also a producer has the benefit of knowing that the soil in which his crops are grown can be seen as a renewable resource. According to New Standard Encyclopedia soils are a renewable resource, which means that whatever is taken out of the soil can be put back into the soil over time (New Standard 1992). Also as long as good soil upkeep is kept then the soil will continue to renew itself. This could be very beneficial to a producer who is practicing CA and is looking to keep soils at a productive level for an extended period of time.
Also for the farmer and/or producer they can use this same land in another way when crops have already been harvested. The introduction of grazing livestock to the same field that once held crops can be beneficial for not only the producer, but also the field itself. Livestock can be used as a natural fertilizer for a producer’s field which will then be beneficial for the producer the next year when crops are planted once again. The practice of grazing livestock in a CA helps both the farmer who raises crops on that field and also helps the farmer who raises the livestock that graze off that field. Since livestock produce compost or manures then livestock are a great help in producing soil fertility. (Pawley W.H. 1963) With the practices of CA and grazing livestock on a certain field for many years can allow for better yields in the following years as long a practices are continued to be followed. The FAO believes that there are three major benefits from CA. The first of being that within fields that are controlled by CA the producer will see an increase in organic matter. The second benefit is an increase in water conservation due layer of organic matter and ground cover to help eliminate transportation and access runoff of water. The third benefit of CA is an improvement of soil structure and rooting zone. These benefits are essential when it comes to producing higher yields, which is mostly what producers are trying to do now but only through conventional methods rather than CA.
Future of CA
As in any other businesses, producers and conservationist are always looking towards the future. In this case CA is a very important process to be looked at in order for the future generations to have a chance to produce. As of today there are many organizations that have been created in order to help educate and inform producers and conservationist in the world of CA. These organizations can help to inform, conduct research and buy land in order to preserve animals and plants (New Standard 1992).
Another way in which CA is looking to the future is through prevention. According to the European Journal of Agronomy producers are looking for ways to reduce leaching problems with in their fields. These producers are using the same principles within CA, in that they are leaving cover over their fields in order to save fields from erosion and leaching of chemicals out of fields (Kirchmann & Thorvaldsson 2000). Processes and studies like this are allowing for a better understanding on how to conserve on what we are using and finding ways to put back something that may have been lost before.
With in the same journal article comes another way in which producers and conservationist are looking towards the future. Circulation of plant nutrients can be a vital part to conserving for the future. An example of this would be the use of animal manure being spread out over a particular area. This process has been done for quite some time now, but the future is looking towards how to handle and conserve the nutrients within manure for a longer period of time. But besides just animal waste also food and urbanized waste are being looked towards as a way to utilize growth within CA (Kirchmann & Thorvaldsson 2000). Turning these products from waste to being used to grow crops and improve yields is something that would be beneficial for both conservationist and the producer.
Problems with Conservation Agriculture
As much as Conservation Agriculture can benefit the whole world with all that is good within it, there are some problems that come with CA. As in any system not all things can be exactly perfect or do exactly what is needed for that task. Conservation agriculture can also fall into this category too. There are many reasons why conservation agriculture cannot always be a win-win situation. The first reason why CA still has some problems is because there are not enough people that can financially turn from a conventional farmer to a conservationist. With in the process of CA comes time, when a producer first starts to process as a conservationist the results can be a financial loss to that certain producer. Since CA is based upon establishing an organic layer and producing its own fertilizer, then this may take time to produce that layer. It can be many years before a producer will start to see better yields than he/she has had previously before. Another financial undertaking is purchasing of new equipment. When starting CA a producer may have to buy new planters or drills in order to produce effectively, also comes the responsibility of harvesting a crop. These financial tasks are ones that may impact whether or not a producer would want to conserve or not.
Also with the struggle to adapt comes the struggle to make CA grow across the globe. CA at this point has not spread as quickly as most conservationists would like it to have. The reasons for this is because there is not enough pressure for producers in places such as North America to change their way of living to a more conservative outlook. But in the tropics there is more of a pressure to change to conservation areas because of the limited resources that are available. Places like Europe have also started to catch onto the ideas and principles of CA, but still nothing much is being done to change due to their being a minimal amount of pressure for people to change their ways of living (FAO 2006).
Also, within CA comes the whole idea of producing enough food at this moment to feed all the people in the world at this moment. With cutting back in fertilizer, not tilling of ground and among other processes comes the responsibility to feed the world. According to the Population Reference Bureau, at the 2000 census count of the world population there were around 6.08 billion people on earth. By the time the year 2050 there is an estimated 9.1 billion people on earth. Within this increase comes the responsibility for producers around the world to make an increase in food supply with the same or even less amounts of land to do it on. With CA problems arise in the fact that if farms do not produce as much as conventional ways, then in this case leaves the world with less food for more people.
Food and Agriculture Organization (FAO). 2006.Agriculture and Consumer Protection Department. Rome, Italy Available from http://www.fao.org/ag/magazine/0110sp.htm (Accessed November 2007).
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Kirchmann, H., Thorvaldsson, G. 2000. European Journal of Agronomy. Challenging Targets for Future Agriculture. Vol. 12, Issues 3-4. Pg 145-161.
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