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Fertilizer, Soil Amendments

Fertilizers or fertilisers are compounds given to plants with the intention of promoting growth; they are usually applied either via the soil, for uptake by plant roots, or by foliar spraying, for uptake through leaves. Fertilisers can be organic (composed of organic matter, i.e. more...

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carbon based), or inorganic (containing simple, inorganic chemicals). They can be naturally-occurring compounds such as peat or mineral deposits, or manufactured through natural processes (such as composting) or chemical processes (such as the Haber process).

Fertilizers typically provide, in varying proportions, the three major plant nutrients (nitrogen, phosphorus, and potassium), the secondary plant nutrients (calcium, sulfur, magnesium), and sometimes trace elements (or micronutrients) with a role in plant nutrition: boron, manganese, iron, zinc, copper and molybdenum.

Inorganic fertilizers

  • Examples of naturally-occurring inorganic fertilizers include diatomaceous earth and limestone.
  • Examples of manufactured or chemically-synthesized inorganic fertilisers include ammonium nitrate, potassium sulfate, and superphosphate, or triple super phosphate.

Synthesized materials are also called artificial fertilizers, and may be described as straight, where the product predominantly contains the three primary ingredients of nitrogen (N), phosphorous (P) and potassium/potash (K), often described as NPK fertilizers. They are named or labelled according to the content of these three elements, thus a 5-10-5 fertilizer would have 10 percent phosphate in its ingredients. If nitrogen is the main element, they are often described as nitrogen fertilizers.

Alternatively they may be described as compound where there is a mix of nutrients.

Chemist Justus von Leibig (in the 19th century) contributed greatly to understanding the role of inorganic compounds in plant nutrition and devised the concept of Leibig's barrel to illustrate the significance of inadequate concentrations of essential nutrients. At the same time he deemphasized the role of humus. This theory was influential in the great expansion in use of artificial fertilizers in the 20th century.

Nitrogen fertilizer is often synthesized using the Haber-Bosch process, which produces ammonia. This ammonia is applied directly to the soil or used to produce other compounds, notably ammonium nitrate, a dry, concentrated product. It can also be used in the Odda Process to produce compound fertilizers such as 15-15-15. The Haber-Bosch process uses about one percent of the Earth's total energy supply (primarily in the form of natural gas) in order to provide half of the nitrogen needed in agriculture.

Inorganic fertilisers typically do not replace trace mineral elements in the soil which become gradually depleted by crops grown there. This has been linked to studies which have shown a marked fall (up to 75%) in the quantities of such minerals present in fruit and vegetables.

Read more at Wikipedia.org


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Fresh Organic Compost Starter Help Feed Rescued Horses $0.99 Dithane M-45 Mancozeb Fungicide Roses Veggies Turf 6oz $8.95
Worm Castings,Organicworm,Orga nic Fertilizer, 45 Lbs $11.75 SuperThrive Plant Vitamins Quart - 32 oz - Hydroponics $44.95
100 Bottles Green Green Lucky Bamboo Food *Wholesale* $24.99 FoxFarm Soluble Tri Pack Plant Nutrients $81.95
Organic fertilizer pellets 2-4-2 Compost / Rock Phos $10.00 Fox Farm Peace of Mind All Purpose Fertilizer 4lbs $8.95
Superthrive Plant Vitamins Hormones All Organic 2 oz $3.99 Earthway spreader for salt or fertilizer 2150 $139.99
Ross Root Feeder Vintage Root Feeder Tool Pat App For $7.99 Earth Juice Meta K 1Quart Hydroponics Soil Nutrients $11.95
Superthrive 32 oz Vitamin Hydroponics 32oz Quart $44.95 Neem Oil Organic Insecticide Miticide Fungicide 16oz $15.95
Earth Juice Bloom 1 Quart Hydroponic or Soil Nutrients $10.95 Brand New Soilsaver Garden Composter $61.99
Jobes Organic Rose & Shrub Fertilizer Spikes 100Pk Bulk $66.95 Superthrive 16 oz Vitamin Hydroponics 16oz Pint $28.95
General Hydroponics Flora Series Nutrients 3 Gallons $58.95 Certified Organic Garden Compost Plant Soil Amendment $5.99
Fox Farm Happy Frog Organic Rose Food 4lbs $8.95 3 Bottles of Osmocote Vegetable & Bedding Plant Food $24.00
General Hydroponics MaxiGro & MaxiBloom Dry Nutrients $24.99 Black New Worm Factory Farm 5 tray Garden Compost Bins $77.99
Fox Farm Grow Big Hydroponic Formula 1 Quart $18.49 Spray N Grow Fertilizer Hydroponics Hps -8 oz $11.95
Spray N Grow Fertilizer Hydroponics Hps - Liter $32.95 General Hydroponics Ph Up & Down 32oz Quart 32 oz $19.99
1 lb pkg of Trace Element Frit for Bonsai Sale! Save $2 $3.98 Terracotta Worm Factory Farm 5 tray Garden Compost Bins $77.99
8oz Dyna-Gro Liquid Grow 7-9-5 8 oz Brand New! $11.99 5 Tray Worm Factory Garden Composter Compost Bin Faster $77.00
5Lbs 100% Natural Organic Plant Food Fertilizer 5-5-5 $0.99 Fox Farm Tiger Bloom 1 Quart Hydroponics Nutrients $18.49
Brand New! Dyna-Gro 100% Pure Neem Oil 32 oz $22.95 10 pack Crystal Pearl Soil Grow Plant Jewel Polymer/Gel $3.99
Bagged Straw Mulch $8.00 liquid made by composting worms oderless 1 quart $6.99 $6.99
Nip Ferry Morse Easy to Use Soil Test Kit $0.99 Fox Farm Big Bloom 1Gallon Hydroponic Plant Nutrients $42.95
organic fertilizer 1 pint(16oz) $3.95 plants love it! $3.95 Shaklee Metering Applicator Miracle Grow Lawn Sprayer $11.00
Organic Plant Fertilizer- Liquid Compost- Garden Gifts $3.20 Crystal Bubble Nutrition Mud Soil For Growing Plant New $1.99
Dyna-Gro Liquid Grow 7-9-5 16 oz Fertilizer New! 16oz $7.85 8oz Physan 20 Algaecide Fungicide Bactericide 8 oz $9.40
5 Tier Worm Bins Compost Maker Tea Composter Organtic $74.99 General Hydroponics FloraBlend Vegan Compost Tea - 32oz $11.95
Organic Fertilizer for Lawns - 32 oz (concentrated) $2.99 Lancaster County, Pennsylvania Topsoil $6.99
5 Lbs Azomite- Organic Trace Mineral Fertilizer- Garden $9.95 Superthrive - Bonsai Tree Vitamins & Hormones 4 oz. $10.95
Fox Farm Happy Frog Organic Bulb Fertilizer 4lbs $8.95 Humboldt County Purple Maxx Hydroponics Hps 32 oz $77.95
Box O Castings worm castings fertilizer compost $5.49 Vermiculite, Aggregate (4 cu. feet) - New Bag! $12.99
Organic Fertilizer Compost Tea 50 gallons! Guano! $11.99 Fox Farm Happy Frog Organic Fruit Flower Fertilizer 4lb $8.95
Cockadoodle Doo Chicken Orgainic Fertilizer - 40# $24.95 Hawaiian Volcanic Cinder Lava Rock ~ 1/3 Cubic Ft. $7.99
worm tea 1 pint(16oz)$3.95 concentrated plants love it! $3.95 Fox Farm Tiger Bloom 1 Gallon Hydroponics Nutrients $53.95
Superthrive 4 oz Vitamin Supplement Hydroponics 4oz $11.90 Animal Repellent Formula (Arf) -deer away from garden ! $3.33
Natures Nectar 3 Qt Hydroponic Nutrient Combo Pack $48.95 Fox Farm Happy Frog Organic Acid Loving Plant Food 4lbs $8.95
General Hydroponics Floragro Flora Grow 1 Quart 32oz $7.95 Fox Farm Happy Frog High Phosphorous Bat Guano 4lbs $11.95
Schultz-Instant Soluble Plant Food 20-30-20 Transplants $7.99 Orchid Plant Food 10 Oz $2.42
Technaflora B.C. Grow Bloom Fertilizer Kit Hydroponics $38.95 Dyna-Gro Liquid Bloom 3-12-6 16 oz Fertilizer New! 16oz $7.85
Fox Farm Happy Frog Organic Jump Start Plant Food 4lbs $8.95 Humic Acid Organic Fertilizer! 2 lbs of soluble powder! $10.00
European Nightcrawlers 1 Lb Fishing & Compost $19.00 Perlite, Horticultural (8 Dry Quarts) from Fafard - New $4.99
SubCulture by General Hydroponics 6 oz. Free Shipping $71.50 10 Lbs Jerusalem Stone Natural Organic Dolomite Lime $15.95
General Hydroponics Ph Down 1 Gallon Brand New $19.99 Worm Factory Farm 5 tray Garden Compost Bin No Reserve $51.00
Worm Factory farm Garden Compost 4 Tray bin Green Nr $35.95 4 Bottles of Ironite Plus Liquid Lawn & Garden Spray $32.00
Plant Gel Potting Soil Alternative Watering Crystals $0.99 N-Zyme Septic System Treatment - Once Every 6 Month $24.95
SuperThrive Plant Vitamins Pint - 16 oz - Hydroponics $27.95 Superthrive Plant Vitamins Hormones 32 oz 1 Quart $37.95
Sea Island Jamaican Bat Guano $6.00 Compost Tea Bucket $49.99
Earth Juice Bloom 1 Gallon Hydroponic or Soil Nutrients $24.95 3-Pack Crystal Magic Soil - Alternative Plant Watering $1.99
Fox Farm Big Bloom 1Quart Hydroponic Plant Nutrients $14.49 TechnaFlora pH Down 1L pH Adjustment Liquid Hydroponics $8.95
TechnaFlora pH Down & pH Up 1L pH Adjustment Liquid Kit $17.95 Earth Juice Catalyst 1Gallon Hydroponics Soil Nutrients $24.95
Hydroponics Plant Food Nutrients Fertilizer6 gals $5.5 $5.50 composted horse manure $0.01
General Hydroponics Floramicro Nutrients 1 Gallon $24.95 Miracle Gro Grow Garden Feeder plus 1 lb Plant Food New $3.99
Bonsai Tree Potting Soil - 5qt $15.80 Skag Grass Catcher $500.00
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Prices current as of last update, 05/17/08 7:55pm.

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