this article introduce the difference between organic fertilizer and inorganic fertilizer. it is very helpful for farmers to know details about fertilizer types.

1. Difference Between OrganicFertilizerand Inorganic Fertilizer
In general, the only difference between organic and inorganic fertilizer is that
organic fertilizers are usually made from natural materials such as compost,
manure, or something similar, while inorganic fertilizers are either mined from
the ground or manufactured.
Plants need the same basic elements for growth whether they are provided by
an organic or inorganic source. Every farmer or gardener must decide for
themselves which method they wish to use, but it is usually best to make one's
decision based on sound science, which exists for both types of fertilizer.
Organic fertilizer is only a source of nitrogen; chemical manmade fertilizers can
offer nitrogen, potassium, phosphorous and other microelements. These
fertilizers are stable and can be easily transported at long distances.
Natural fertilizers are insufficient for all the world.
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An organic fertilizer is composed of organic matters, like manure, ground
alfalfa or soy, or the byproducts of chicken farms (feather meal) or fisheries
(fish meal, fish bone meal, fish emulsion). Organic fertilizers need soil
organisms to break them down and release their nutrients, so most of them
release their nutrients slowly, over an extended period. Organic fertilizer
blends can be built into the soil so they release over the entire season, instead
of fertilizing every few weeks.
Chemical fertilizers are water-soluble salts that are available to plants as soon
as they're dissolved in water. Because they're water soluble, they can be
flushed through the soil by heavy rains, and contaminate streams, rivers, and
lakes, where they can cause algae blooms and fish die-offs. "Dead zones" at
the mouths of some major rivers may be the result of excessive fertilizers
washing into the water.
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2. Inorganic fertilizer is often nitrogen based. Because of this type of fertilizer, it
can often harm or kill animals and people. Many people also think that
spending time around fertilizer for a while can cause cancer.
Oganic fertilizer on the other hand, is a much better choice if your're willing to
wait around for you grass to grow better. Usually, organic fertilizer is made up
of manure pellets, so usually that keeps the kids away for a day or two. with
organic fertilizers, you often must treat lawns and soils more often.
If you choose inorganic, compare it to the organic package's information, and
ask yourself: would my neighbor appreciate this? could this be harmful to
animals, children, or ever myself if its around these things? how was this made?
is this really that great for the earth in general?
A big con for going organic, besides the price (EEK!), is keeping the pups away.
dont worry too much, a good choice is to ship them off to mums house down
the street, or a mate's place. once my pups got a bellyful of organic fertilizer,
and they fell ill with a stomach ache for a day or two.
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The term "organic" refers to matter that is made up of a Carbon base.
Examples of matter made up of a Carbon Base includes Living matter (Plants
& Animals), Sugars, Fats, Wood, Oil products, etc.
So in this case an organic fertiliser is one derived from organic products,
Sheep manure is digested plant material, Blood and Bone is pulverized animal
material, all carbon based. A Crude oil based product would also be organic
although you would not find this on the label.
A Non-Organic (sometimes referred to as "Chemical") fertiliser is anything else,
they contain only the nutrients needed by the plant and come in a range of
mixes depending on nutritional requirements when they are to be applied.
Organic fertilisers are great for adding organic matter to the soil and for feeding

3. soil microbes however they need time to be broken down to the point where
they are useful for the plant. Chemical fertilisers are available to the plant as
soon as they are in solution within the soil.