Organic Fertilizers
In organic farming, compost made from manure is somehow questionable. The manure used in preparing compost may originate from non-organic animals. Some compost may contain sewage sludge, and discarded animal parts from slaughter house.
Organic fertilizers made of guano, blood meal, bone meals, fish meals, etc, are more complex than chemical fertilizers. The mineral contain are difficult to identify and quantify. Lack of crucial information on the mineral contain may easily lead to over fertilized, nutrient leaching, heavy metal toxicity and many other issues.
Composting is a very complex process, which involved micro-organisms and subject to specific ideal conditions : temperature, moisture content, O2 content, C:N ratio and type of ingredient. Anaerobic composting releases CO2, hydrogen sulfide and methane ; while aerobic system releases co2 and heat. High temperature destroys insects, larvae, weed seeds, but no compost will be totally sterilized by high temperatures alone, thus open a window for contamination of pathogens and disease vectors to the farm and the consumers.
Organic fertilizers are bulky, making it less manageable. The use of agricultural machinery powered by diesel-engine during preparation of compost, storing, transporting and application contribute equally to depletion of non-renewal energy sources.
Productivity
Issue of productivity is more than a summary of yield per arable land. However, the hidden costs of conventional farming’s side-effects, like environmental damage, health risk, consumption of energy, usage of water, of which eventually will reach to the consumer.
However, basic economy sees only production per arable land. There are still no conclusive data supporting the claim that farming is able to meet the demand for affordable food. Norman Borlaug, father of the ‘Green Revolution’, a Nobel Peace Prize laureates, asserts that organic farming can at most feed 4 billion people, after expanding cropland dramatically and destroying ecosystems in the process.
However, some believe that organic farms require more land to produce same amount of foods as conventional farms. If this argument is true, organic farming could potentially destroy the rainforests and wipe out many ecosystems. ( Bob Goldberg. 2000. The Hypocrisy of Organic Farmers. )
Pesticide Residue
Organic farming standards do not allow the use of synthetic pesticides, but they do allow the use of specific pesticides derived from plants. The most common organic pesticides, accepted for restricted use by most organic standards, include Bt, pyrethrum and rotenone. Rotenone is a rotenoid plant extract obtained from barbasco, cub, haiari, nekoe and timbo. it is EPA toxicity class I or III – highly toxic or slightly toxic, depending on formulation.
A study published in 2002 showed that organically grown foods consistently had about one-third as many residues as conventionally grown foods. ( Baker, et al. 2007. Pesticide Residues in Conventional, IPM-Grown and Organic Foods : Insights From Three U.S. Data Sets. ) (Goldberg. 2005. Consumers Union Research Team Shows : Organic Foods Really do Have Less Pesticides )
High Retail Price
One of the objectives of organic movement is to produce food for local community. However, due to the low yield/acre, the organic farmers had no choice but to sell their produce at higher retail price. Without proper certification and control, anyone can claim their produce as ‘organic’ and sell at premium price. Thus organic becomes the food for the ‘fooled’ wealthy-few.
Healthier & Safer Food
There is no conclusive proof to support the claim that organically grown produce are healthier and nutritious. Organically grown produce are equally susceptible to contamination without proper use of organic fertilizers and pesticides, poor handling and storage.
Some unethical shop owners simply market their poor-quality produce as ‘naturally grown’ or ‘no chemical fertilizers used’, insect-damaged as ‘insecticide-free’, etc.
Soil Conservation
Some organic farming practices are claimed to do more damage than conventional practices, for instance, soil preparation by ploughing is claimed to increase soil damage compared to using Roundup.
Sustainability
Although it is generally held that organic farming is sustainable agriculture, the two are not synonymous. Sustainable is a concept with the idea of approaching as closely as possible a balance between what is taken out of the soil, and what is returned to it, without outside inputs.
Application of organic fertilizer, in the contrary, is act of imports of nutrient, which violates the concept of sustainability.
Thus, an organic farm, even operated in small scale, shall be able to self-sustain as a complete ecosystem. While the nutrients are taken out ( harvested produce ) from the soil, equal amount of the nutrients are to return to the soil ( in-situ manure ).
Environmental Friendly
Organically grown produce are normally sale in specialty store or special refrigerated shelves in hypermarkets, packed in individual plastic bags. Instead of side-tracked to centralized food system, organic produce should market directly to the local community to avoid unnecessary transportation cost, packaging, storage as a more energy-saving, and less-waste-production approach.
Showing posts with label organic. Show all posts
Showing posts with label organic. Show all posts
Tuesday, 2 June 2009
Saturday, 30 May 2009
Organic Farming - Benefits
Agricultural Contaminants
Agricultural contaminants such as inorganic fertilizers, herbicides and insecticides from conventional agriculture are a major concern all over the world.
Eutrophication, the suffocation of aquatic plants and animals due to rapid growth of algae, referred to as "algae blooms", are literally killing lakes, rivers and other bodies of water. Persistent herbicides and insecticides can extend beyond target weeds and insects when introduced into aquatic environments. These chemicals have accumulated up the food chain whereby top predators often consume toxic dosages. Organic agriculture restores the environmental balance and has none of these or other such deleterious effects on the environment.
Biodiversity
A wide range of organisms benefit from organic farming, but it is unclear whether organic methods confer greater benefits than integrated agri-environmental conventional programs.
Organic crops use little or no herbicides and pesticides and thus biodiversity fitness and population density benefit. Many weed species attract beneficial insects that improve soil qualities and forage on weed pests. Soil-bound organisms often benefit because of increased bacteria populations due to natural fertilizer spread and reduced intake of herbicides and pesticides. Varieties of bacteria and fungi break down chemicals, plant matter and animal waste into productive soil nutrients. In turn, the producer benefits by healthier yields and more arable soil for future crops.
Soil Conservation
Agriculture relies on roughly one meter of topsoil, and that is being depleted ten times faster than it is being replaced.
No-till farming, which some claim depends upon pesticides, is regarded as one way to minimize erosion. However, a recent study by the USDA's Agricultural Research Service has found that manure applications in organic farming are better at building up the soil than no-till despite tillage.
Mitigate Climate Change
Organic agriculture can reduce greenhouse gas emissions by effectively locking more carbon into the soil rather than releasing it into the atmosphere. Application of compost, mulch, green manure etc introduced more organic matter in to the soil, locking up carbon and keeping it out of the atmosphere. Scientists also believe that emission of methane gas, a noxious greenhouse gas, from conventional animal husbandry, could be cut dramatically by feeding the cows with leguminous foliage.
Production of ammonium nitrate fertilizer, which is indispensable in conventional faring, produces NO2, another greenhouse gas. Organic farming, which excludes application of chemical fertilizers, too will remove the potential emission of NO2 into the atmosphere.
Food Quality & Safety
Organic food is widely believed by the lay public to be healthier than conventional food, although the research is inconclusive. Organic produce is likely to have less agrochemical residues, but these residues are generally below the acceptable daily intake and their health impact is questionable. Organic food also appears to have lower nitrate concentrations, but the health impact of nitrates is debated. However, studies show both organic and conventional food are expected to have similar concentrations of persistent organic pollutants and heavy metals.
Energy Saving
Currently, we use around 10 calories of fossil energy to produce one calorie of food energy. Studies by the Department for Environment, Food and Rural Affairs shows that, on average, organically grown crops use 25% less energy than conventional agricultural.
The organic movement was born out of a commitment to provide local food for local people, and so it is logical that organic marketing encourages localisation through veg boxes, farm shops and stalls. Local distribution and consumption (such as organic box schemes), energy used dwindled to a fraction of that needed for an intensive, centralised food system.
Agricultural contaminants such as inorganic fertilizers, herbicides and insecticides from conventional agriculture are a major concern all over the world.
Eutrophication, the suffocation of aquatic plants and animals due to rapid growth of algae, referred to as "algae blooms", are literally killing lakes, rivers and other bodies of water. Persistent herbicides and insecticides can extend beyond target weeds and insects when introduced into aquatic environments. These chemicals have accumulated up the food chain whereby top predators often consume toxic dosages. Organic agriculture restores the environmental balance and has none of these or other such deleterious effects on the environment.
Biodiversity
A wide range of organisms benefit from organic farming, but it is unclear whether organic methods confer greater benefits than integrated agri-environmental conventional programs.
Organic crops use little or no herbicides and pesticides and thus biodiversity fitness and population density benefit. Many weed species attract beneficial insects that improve soil qualities and forage on weed pests. Soil-bound organisms often benefit because of increased bacteria populations due to natural fertilizer spread and reduced intake of herbicides and pesticides. Varieties of bacteria and fungi break down chemicals, plant matter and animal waste into productive soil nutrients. In turn, the producer benefits by healthier yields and more arable soil for future crops.
Soil Conservation
Agriculture relies on roughly one meter of topsoil, and that is being depleted ten times faster than it is being replaced.
No-till farming, which some claim depends upon pesticides, is regarded as one way to minimize erosion. However, a recent study by the USDA's Agricultural Research Service has found that manure applications in organic farming are better at building up the soil than no-till despite tillage.
Mitigate Climate Change
Organic agriculture can reduce greenhouse gas emissions by effectively locking more carbon into the soil rather than releasing it into the atmosphere. Application of compost, mulch, green manure etc introduced more organic matter in to the soil, locking up carbon and keeping it out of the atmosphere. Scientists also believe that emission of methane gas, a noxious greenhouse gas, from conventional animal husbandry, could be cut dramatically by feeding the cows with leguminous foliage.
Production of ammonium nitrate fertilizer, which is indispensable in conventional faring, produces NO2, another greenhouse gas. Organic farming, which excludes application of chemical fertilizers, too will remove the potential emission of NO2 into the atmosphere.
Food Quality & Safety
Organic food is widely believed by the lay public to be healthier than conventional food, although the research is inconclusive. Organic produce is likely to have less agrochemical residues, but these residues are generally below the acceptable daily intake and their health impact is questionable. Organic food also appears to have lower nitrate concentrations, but the health impact of nitrates is debated. However, studies show both organic and conventional food are expected to have similar concentrations of persistent organic pollutants and heavy metals.
Energy Saving
Currently, we use around 10 calories of fossil energy to produce one calorie of food energy. Studies by the Department for Environment, Food and Rural Affairs shows that, on average, organically grown crops use 25% less energy than conventional agricultural.
The organic movement was born out of a commitment to provide local food for local people, and so it is logical that organic marketing encourages localisation through veg boxes, farm shops and stalls. Local distribution and consumption (such as organic box schemes), energy used dwindled to a fraction of that needed for an intensive, centralised food system.
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