Showing posts with label agriculture. Show all posts
Showing posts with label agriculture. Show all posts

Friday, 29 May 2009

Organic Farming - Methods

"An organic farm, properly speaking, is not one that uses certain methods and substances and avoids others; it is a farm whose structure is formed in imitation of the structure of a natural system that has the integrity, the independence and the benign dependence of an organism"
Wendell Berry "The Gift of Good Land"


Organic farming is a production system which favors maximum use of organic material and discourage use of synthetically produced agro-inputs, for maintaining soil productivity and fertility and pest management under conditions of sustainable natural resources and healthy environment.

Soil Management

Plants rely primarily on soil for water and nutrients. It is therefore soil health is utmost important for organic farmers. But providing adequate nutrients is often a challenge.

Crop rotation, green manure, intercropping, cover cropping, mulching etc., help to provide nutrient to the soil, as well as increasing the soil’s organic matter. Certain processed fertilizers such as seed meals, compost, bloodmeal, animal excreta, naturally-occurred-fertilizer, eg. rock phosphate and limestone are used. Altogether these methods help to control erosion, promote biodiversity, and enhance the health of the soil.

Weed Control

Weed control is the botanical component of pest control, stopping weeds from reaching a mature stage of growth when they could be harmful to domesticated plants and livestock.

Typically, a combination of methods is used in organic farming. The most basic is manual weeding, with hand or aided with some simple tools. Flaming, a traditional technique is sometime used, but subjected to local legislation. Mechanically tilling and ploughing, are effective ways to control weeds, were however involve diesel-powered tractor, unfortunately which is not an environmental-friendly machine. Other techniques for controlling weeds include mulch, solarization, crop rotation, drip-irrigation ( limit weeds access to water ) natural pre-emergence herbicide ( e.g. corn gluten meal, garlic, clove oil, borax, pelargonic acid, table salt, vinegar, and various other homemade remedies).

Control Other Organisms

Organisms aside from weeds which cause problems include athropods (e.g. insects, mites) and nematodes. Fungi and bacteria can cause disease.
Insect pests are a common problem, and insecticides, both non-organic and organic, are controversial due to their environmental and health effects. One way to manage insects is to ignore them and focus on plant health, since plants can survive the loss of about a third of lead area before suffering severe growth consequences.

To avoid using insecticides, one can select naturally-resistant plants, put bags around the plants, remove dying material such as leaves, fruit, and diseased plants, covering plants with a solid barrier ("row cover"), hosing, encouraging and releasing beneficial organisms and beneficial insects, planting companion plants and polycultures, various traps, sticky cards and season extension. Biological pest control uses natural predators to control pests. Recommended beneficial insects include minute pirate bugs, big-eyed bugs, ladybugs, lacewings, parasitoid wasps, praying mantis and predatory mites.

Several of pesticides approved for organic use have been called green pesticides such as spinosad and neem. Generally, but not necessarily, organic pesticides are safer and more environmentally friendly than synthetic pesticides. The main three organic insecticides used are Bt (a bacterial toxin), pyrethrum and rotenone. Nicotine sulfate may also be used; although it breaks down quickly, it is extremely toxic, nearly as toxic as aldicarb. Less toxic but still effective organic insecticides include neem, spinosad, soaps, garlic, citrus oil, capsaicin (repellent), Bacillus popillae, Beauvaria bassiana, and boric acid. Pesticides should be rotated to minimize pest resistance.

The first disease control strategy involves keeping the area clean by removing diseased and dying plants and ensure that the plants are healthy by maintaining water and fertilization. Polycultures reduce the ability of disease to spread. Disease-resistant cultivars can be purchased. Organic fungicide include the bacteria Bacillus subtilis, Bacillus pumilus, and Trichoderma harzianum which are mainly effective for diseases affecting roots. Bordeaux mix, sulfur, lime sulfur, potassium and sodium bicarbonate can be used as an organic fungicide in various forms

Thursday, 28 May 2009

Organic Farming - Certification

Organic certification is a certification process for producers of organic food and other organic agricultural products. In general, any business directly involved in food production can be certified, including seed suppliers, farmers, food processors, retailers and restaurants.


Requirements generally involve a set of production standards for growing, storage, processing, packaging and shipping that include:
- avoidance of most synthetic chemical inputs (e.g. fertilizer, pesticides, antibiotics, food additives, etc), genetically modified organisms, irradiation, and the use of sewage sludge;
- use of farmland that has been free from chemicals for a number of years (often, three or more);
- keeping detailed written production and sales records (audit trail);
- maintaining strict physical separation of organic products from non-certified products;
- undergoing periodic on-site inspections.

















Organic Farming - Organic Movement

In Germany Rudolf Steiner's Spiritual Foundations for the Renewal of Agriculture, published in 1924, led to the popularization of biodynamic agriculture, probably the first comprehensive organic farming system, that was based on Steiner's spiritual and philosophical teachings.

The first use of the term "organic farming" is by Lord Northbourne (aka Walter James, 4th Baron Northbourne). The term derives from his concept of "the farm as organism", which he expounded in his book, Look to the Land (1940), and in which he described a holistic, ecologically balanced approach to farming. Northbourne wrote of "chemical farming versus organic farming". http://www.orgprints.org/10138.

Sir Albert Howard's 1940 book, An Agricultural Testament, was influential in promoting organic techniques, and his 1947 book "The Soil and Health, A Study of Organic Agriculture" adopted Northbourne's terminology and was the first book to include "organic" agriculture or farming in its title.

In 1939, strongly influenced by Sir Howard's work, Lady Eve Balfour launched the Haughley Experiment on farmland in England. It was the first, side-by-side comparison of organic and conventional farming. Four years later, she published The Living Soil, based on the initial findings of the Haughley Experiment. It was widely read, and lead to the formation of a key international organic advocacy group, the Soil Association.

During the 1950s, sustainable agriculture was a research topic of interest. The science tended to concentrate on the new chemical approaches. In the U.S., J.I. Rodale began to popularize the term and methods of organic growing. In addition to agricultural research, Rodale's publications through the Rodale Press helped to promote organic gardening to the general public.

In 1962, Rachel Carson, a prominent scientist and naturalist, published Silent Spring, chronicling the effects of DDT and other pesticides on the environment. A bestseller in many countries, including the US, and widely read around the world, Silent Spring was instrumental in the US government's 1972 banning of DDT. The book and its author are often credited with launching the environmental movement.

In the 1970s, worldwide movements concerned with environmental pollution caused by persistent agrichemical increased attention on organic farming. One goal of the organic movement was to promote consumption of locally grown food, which was promoted through slogans such as "Know Your Farmer, Know Your Food".

In 1972, the International Federation of Organic Agriculture Movements (IFOAM), was founded in Versailles, France. IFOAM was dedicated to the diffusion of information on the principles and practices of organic agriculture across national and linguistic boundaries.

In the 1980s, around the world, various farming and consumer groups began seriously pressuring for government regulation of organic production to ensure standards of production.
This led to various legislation and certification standards being enacted through the 1990s and to date. Currently, most aspects of organic food production are government-regulated in the US and the European Union.

In the 2000s, the worldwide market for organic products (including food, beauty, health, bodycare, and household products, and fabrics) has grown rapidly. More countries are establishing formal, government-regulated certification of organic food: in 2002 in the US, in 2005 in China http://eprints.utas.edu.au/895/ and projected for 2006 in Canada, among others. Monitoring and challenging certification rules and decisions have become a regular, high profile aspect of activists in the organic movement.