Types Of Organic Fertilisers Nutrient Value
What Is Organic Fertilisers And What’s In Them?
Organic fertilisers are produced from naturally occurring plant and animal substances. Different organic fertilisers help to add different nutrients required by the plants or crops in to the soil. Depending on the type of plants and depending on the type of soil you may need different fertilisers. Most of the manure derived from animal faeces and decomposed plants are good organic fertilisers. These fertilisers condition the soil, provide nutrients and improve water retention.
Types of manures
There are three main types of organic fertilisers or manures
- Green manure- Fresh plants like peas, grasses, mucuna, calapagonium, etc., are added to the soil by ploughing. Leguminous plants are often used for this purpose as the root nodules of the plants contain nitrogen fixing bacteria. Seaweeds and spent grain from the brewing industry are also used as green manure.
- Farmyard manure – This manure mainly consists of faeces of cattle, sheep, horses, pigs, poultry, etc. Farm yard manure also contains the urine of farm animals and plant parts used as food and bedding for the animals. Before applying dung as manure it is necessary to allow the dung to undergo decomposition for a certain period. Applying fresh manure around plants like daylilies will usually cause burning of the plant roots.
- Compost manure- The decomposed remnants of plant and animal matter is called compost. Compost can be used in gardens, agricultural lands and landscaping, to improve the structure and nutrient value of the soil.
Nutrient content of different manures
Cow manure contains about 17% organic matter. The average NPK ratio is 0.6-0.2-0.5. You can apply 2-4 inches of dried cow manure to the planting beds. During the growing season, you can add composted cow manure for extra nourishment. Cow manure may also contain residues of the medications used for the cattle and pesticide contents.
This manure has high nitrogen content than the cow manure. This manure is very hot and may contain weed seeds. As horses are often provided with supplements the horse manure is great nutrient addition. The average NPK analysis is 0.7-0.3-0.6. it is better to use dry and composted manure as it will kill the weed seeds.
Fish meal contains dried and ground fish waste. This is a rich source of nitrogen, phosphorus and potassium. The average NPK ratio is 2:1:1. For poor soil, you may need to add 3 pounds or 1.3kg of fish meal for 100 square feet.
This is rich in nutrients content as they are fed with calcium supplements. This manure is excellent for vegetable gardens and lawns as it has high nitrogen and phosphorus level.
The NPK values of this manure are 0.8-0.3-0.9. This manure contains micro elements necessary for the growth of the plants.
Sheep manure is dry and rich and is hot manure. The NPK ratio is 0.7-0.3-0.9.
This is the growing medium of the mushrooms. It contains straw, gypsum, hay, chicken manure, etc. NPK analysis is 2-1-1. This is free of pesticide and seeds.
The manure from earthworms has NPK analysis 0.5-0.5-0-3. More than 50% of the manure is organic matter and it contains 11 trace elements.
It contains 25% organic matter and NPK is in the ratio 1:1:1. Aged compost can be applied at any time of the year.
Blood and bone fertiliser
This is a slaughterhouse by product and average NPK of blood meal is 12-0-0 and bone meal is 3.5-18-0.
Crushed egg shells are rich in calcium and the NPK analysis of this manure is 1.2-0.4-0.1.
This is rich in NPK and also contains copper and magnesium. The NPK value is 2-0.3-0.6