Organic farming involves fostering natural processes, often over extended periods of time, and a holistic approach. Chemical-based farming focuses on immediate, isolated effects and reductionist strategies, often based primarily on the desire for profits. In large commercial operations, technology is used to regulate local conditions—hybrid seed, synthetic chemicals, high-volume irrigation—while sophisticated machinery does most of the work, and operators' feet may seldom touch the ground. Beyond the strictly technical aspects, the philosophy, day-to-day activities and required skill sets are quite different.
Enhancing soil health is the cornerstone of organic farming. This is a biological process, driven by microorganisms, that allows the natural production of nutrients in the soil throughout the growing season, and has been referred to as feeding the soil to feed the plant. A variety of methods are employed, including crop rotation, green manure, cover cropping, application of compost, and mulching. Organic farmers also use processed natural fertilizers such as seed meal, and various mineral powders such as rock phosphate and greensand, a naturally occurring form of potash.
Differing approaches to pest control are equally notable. In chemical farming, a specific insecticide may be applied to quickly kill off a particular insect pest. Chemical controls can dramatically reduce pest populations for the short term, yet by unavoidably killing (or starving) natural predator insects and animals, cause an ultimate increase in the pest population. Repeated use of insecticides and herbicides and other pesticides also encourages natural selection of resistant insects, plants and other organisms, leading to increased use, or new, more powerful, controls.
Pest control targets animal pests (including insects), weeds and disease. Organic farming tends to tolerate some level of pest loss, rather than aiming for total eradication. Organic pest control involves the cumulative effect of many techniques, including, allowing for an acceptable level of pest damage, encouraging beneficial organisms, careful crop selection and crop rotation, and mechanical controls such as row covers and traps. These techniques generally provide benefits in addition to pest control—soil protection and improvement, fertilization, pollination, water conservation, season extension, etc.—and these benefits are both complementary and cumulative in overall effect on farm health. Effective organic pest control requires a thorough understanding of pest life cycles and interactions.
source : hydroponicarticle
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