Organic manure is a natural material obtained from plants, animals, and other materials that can decompose. It is added to the soil to improve soil fertility, increase organic matter, and create better conditions for crop growth. Common materials used to make it include animal dung, crop residues, leaves, grasses, and other biodegradable farm waste.
Unlike manufactured fertilizers, organic manure does more than supply nutrients. It also helps improve the physical condition of the soil. When used properly, it can improve soil structure, water-holding capacity, aeration, and the activities of useful organisms in the soil. This makes it an important part of soil fertility management.
Types of Organic Manure
There are different types of organic manure, and they are grouped mainly according to their source and method of preparation. Some are obtained directly from animals, while others are produced by allowing plant and animal materials to decompose.
1. Farmyard Manure
Farmyard manure is prepared mainly from animal dung, urine, bedding materials, and waste collected from animal houses. Cattle, goats, sheep, horses, and other farm animals can provide materials for its preparation. The collected waste is kept under suitable conditions until it decomposes properly.
It adds organic matter and plant nutrients to the soil. The quality of farmyard manure depends on the type of animal, the feed given to the animal, the bedding material used, and how the waste is stored.
2. Compost Manure
Compost manure is produced by allowing plant and other biodegradable materials to decompose. Leaves, grass, crop residues, fruit peels, vegetable waste, and other suitable materials can be used to make compost.
During decomposition, microorganisms break down the materials and turn them into a dark, crumbly substance. Properly prepared compost can be mixed with the soil before planting or used around suitable crops to improve soil condition.
3. Green Manure
Green manure is produced from green plants that are grown mainly to improve the soil rather than for harvest. The plants are allowed to grow for a period and are later cut and incorporated into the soil.
Leguminous plants are often used because many of them can help increase the nitrogen available in the soil through their relationship with nitrogen-fixing bacteria. As the green plant material decomposes, it adds organic matter and nutrients to the soil.
4. Poultry Manure
Poultry manure is obtained from birds such as chickens, turkeys, and ducks. It may contain a good amount of plant nutrients and can be useful for improving soil fertility.
Because poultry waste can be strong when fresh, it should be properly managed before being used on crops. Allowing it to decompose can make it more suitable for application and reduce the risk of damaging plants.
5. Animal Manure
Animal manure refers to waste obtained from farm animals. It may come from cattle, goats, sheep, pigs, horses, and other livestock.
The nutrient content varies according to the animal, its feed, the bedding materials, and storage method. Proper collection and storage can help reduce nutrient loss and improve its usefulness on the farm.
7. Vermicompost
Vermicompost is made with the help of earthworms. The worms feed on suitable organic materials and help break them down into a fine, nutrient-rich material.
It can be used in vegetable gardens, nurseries, flower beds, and other crop production systems. It is also valued because it contains organic matter that can improve the condition of the soil.
Sources of Organic Manure
Organic manure can be obtained from many places around the farm and home. This makes it possible for farmers to recycle materials that might otherwise be thrown away.
Animal Waste
Animal waste is one of the major sources. Dung and urine from cattle, goats, sheep, pigs, horses, and poultry can be collected and properly managed.
Bedding materials from animal houses can also become part of the manure. Straw, dry grass, leaves, and other plant materials used as bedding can mix with animal waste and add more organic matter.
Crop Residues
Crop residues are another important source. After harvesting, materials such as maize stalks, rice straw, vegetable remains, groundnut shells, and other plant parts may remain on the farm.
Instead of burning or throwing away these materials, they can be collected and used to produce compost or other forms of organic manure. This helps return organic materials to the soil.
Leaves and Grass
Dry leaves, fresh grass, and other plant materials can be used in compost preparation. These materials break down over time and contribute organic matter to the finished product.
They are often easy to obtain, especially on farms where vegetation and crop residues are available.
Household Organic Waste
Some household waste can also be used to produce compost. Fruit peels, vegetable remains, leaves, and other biodegradable materials can be collected for this purpose.
However, plastics, glass, metals, and other materials that do not decompose should be removed before the waste is added to the compost.
Farm Waste
Different farming activities produce waste that can be recycled. Weeds, spoiled plant materials, animal bedding, crop residues, and other biodegradable materials can be managed and converted into useful manure.
This reduces the amount of waste around the farm and provides farmers with a low-cost source of organic material.
How Organic Manure Is Prepared
The method used depends on the type of manure being prepared. For compost, suitable materials are collected and arranged in layers or mixed together. A mixture of dry and fresh materials can help provide suitable conditions for decomposition.
The materials need enough moisture for microorganisms to work effectively. However, the pile should not become waterlogged because too much water can reduce air movement and slow proper decomposition.
The compost may be turned from time to time to mix the materials and allow air to enter. As decomposition continues, the materials become darker, softer, and more crumbly. The finished product should have an earthy smell and should not contain large amounts of fresh waste.
Animal manure is usually collected and stored in a suitable place where it can decompose. Good storage helps protect it from excessive rainfall and reduces the loss of nutrients.
Benefits of Organic Manure
Organic manure provides several benefits to the soil and crops. Its value comes not only from the nutrients it contains but also from the organic matter it adds to the soil.
1. Improves Soil Fertility
One major benefit is that it adds nutrients to the soil. Depending on its source, it may contain nitrogen, phosphorus, potassium, calcium, magnesium, sulphur, and other nutrients needed by plants.
As the material decomposes, nutrients are released gradually. This can support crop growth while also helping maintain the fertility of the soil.
2. Adds Organic Matter to the Soil
Organic manure increases the amount of organic matter in the soil. Organic matter is important because it helps maintain the physical and biological condition of farmland.
Soils that are continuously cultivated can lose organic matter over time. Regular addition of suitable organic materials can help replace some of what is lost.
3. Improves Soil Structure
Adding organic matter can improve the way soil particles are arranged. This can make heavy soils easier to work and help loose soils hold together better.
Improved soil structure also creates spaces that allow plant roots to grow more easily. It can also help water and air move through the soil.
4. Improves Water-Holding Capacity
Soil containing enough organic matter can hold water more effectively. This can reduce the speed at which water is lost and help crops have access to moisture for a longer period.
This benefit can be useful in areas where rainfall is irregular or where crops may experience short periods of limited water.
5. Improves Soil Aeration
Organic matter can create better spaces within the soil. These spaces allow air to move through the soil and reach plant roots.
Good aeration is important because roots need oxygen for normal growth. Better soil aeration can also support useful organisms living in the soil.
6. Encourages Useful Soil Organisms
Organic materials provide food for many microorganisms and other organisms in the soil. These organisms help break down organic matter and take part in nutrient cycling.
Their activities help maintain natural processes that contribute to soil fertility. This makes organic manure useful for maintaining active and healthy soil.
7. Helps Reduce Farm Waste
Organic manure provides a useful way to recycle materials that might otherwise become waste. Animal dung, crop residues, leaves, grass, and suitable household organic waste can be converted into useful soil materials.
This can help keep the farm cleaner while also providing farmers with a valuable resource.
8. Helps Maintain Soil Productivity
Continuous farming can gradually affect soil quality when nutrients and organic matter are removed through crop production. Adding organic materials can help maintain the condition of the soil.
It is especially useful when combined with other practices such as crop rotation, erosion control, proper irrigation, and suitable fertilizer application.
9. May Help Reduce Soil Erosion
Organic matter can help improve soil structure and hold soil particles together. Better soil structure can make the soil less easily carried away by water.
However, manure alone cannot prevent erosion. It should be used together with other soil conservation methods such as mulching, cover cropping, contour farming, and proper drainage.
10. Supports Sustainable Farming
Using organic manure allows farmers to recycle materials produced on the farm. This can reduce waste and return useful organic materials to the soil.
It can therefore form part of a sustainable farming system, especially where farmers have regular access to animal waste and crop residues.
Uses of Organic Manure
Organic manure is used for different purposes in crop production. The method of application depends on the type of manure, the crop, the soil, and the stage of crop growth.
1. Improving Soil Fertility
It is applied to farmland to add nutrients and organic matter. Farmers may spread it over the soil before planting and mix it into the soil during land preparation.
This allows the material to begin decomposing and releasing nutrients while improving the condition of the soil.
2. Vegetable Production
Compost and other suitable forms can be used in vegetable farming. They can be added to vegetable beds before planting to improve soil fertility and moisture retention.
Vegetables such as tomato, pepper, okra, cabbage, and other crops can benefit from good soil management.
3. Nursery Preparation
Well-decomposed organic materials can be included in suitable nursery soil mixtures. They help improve the growing medium and provide organic matter for young plants.
Care should be taken to use mature manure because fresh materials may be too strong for young seedlings.
4. Fruit Production
Organic manure can be applied around fruit trees to improve the soil around their root zone. It should be spread carefully and should not be placed directly against the trunk.
Regular soil improvement can support the growth and development of fruit trees when combined with proper watering and other management practices.
5. Flower and Garden Production
Gardeners can use compost and other suitable materials when preparing beds for flowers, herbs, vegetables, and other plants. The manure improves the growing environment by adding organic matter and nutrients.
It can also help garden soil retain moisture and remain easier to work.
6. Land Preparation
Organic manure can be applied during land preparation. It may be spread across the field and incorporated into the soil before planting.
This gives the organic material time to begin breaking down and improving the soil before crops become fully established.
7. Improving Poor Soil
Soils with low organic matter can benefit from regular applications. The material can help improve soil structure, moisture retention, and biological activity.
Improving poor soil usually takes time, so manure should be used as part of a long-term soil management plan.
8. Covering Soil Around Crops
Some forms of organic material can be placed around crops as a protective layer. This can help reduce moisture loss and protect the soil surface.
Materials used for this purpose should be suitable and free from harmful substances.
Factors That Affect the Quality
The quality of organic manure is not the same in every case. Several factors influence the nutrients it contains and how useful it will be after application.
Source of the Material
The original source has a strong effect on the nutrient content. Poultry waste, cattle manure, crop residues, compost, and green manure do not contain exactly the same nutrients or in the same amounts.
Degree of Decomposition
The level of decomposition affects the condition of the finished product. Well-decomposed material is generally more stable and easier to handle than fresh waste.
Moisture
Suitable moisture is needed for decomposition. Very dry materials may break down slowly, while excessive moisture can reduce air movement and create poor conditions.
Storage
Storage conditions can affect nutrient quality. If manure is left exposed to heavy rainfall, some soluble nutrients may be washed away.
Materials Used
The materials included in the mixture also affect the final product. Suitable biodegradable materials should be selected, while plastics, glass, metals, and other unwanted materials should be kept out.
Precautions When Using Organic Manure
Proper handling is important when preparing and applying manure. Farmers should use well-decomposed material where possible and keep harmful or non-decomposable materials out of it.
Manure should be stored in a suitable place where excessive rain cannot wash away nutrients. It should also be kept away from drinking-water sources.
Fresh manure should not be placed directly against young plants because it may cause damage. Farmers should also wash their hands after handling animal waste or compost and follow safe handling practices.
Organic Manure and Chemical Fertilizer
Organic manure and chemical fertilizer both help provide nutrients to crops, but they are not the same. Organic materials come mainly from plants, animals, and other natural materials, while chemical fertilizers are manufactured or processed to supply specific nutrients.
Chemical fertilizers usually contain nutrients in more concentrated and clearly stated amounts. Organic manure normally contains a wider mixture of nutrients together with organic matter, but the exact nutrient content can vary.
The two can be used separately or together depending on the condition of the soil and the needs of the crop. Good soil fertility management focuses on providing the right nutrients while also maintaining good soil condition.
Role in Sustainable Agriculture
Organic manure can support sustainable agriculture by helping farmers recycle materials that are produced on the farm. Animal waste, crop residues, leaves, and other biodegradable materials can be returned to the soil instead of being wasted.
Its use can also help maintain organic matter and improve soil properties over time. However, good farming requires more than manure alone. Practices such as crop rotation, erosion control, proper irrigation, mulching, weed management, and appropriate fertilizer use may also be needed.
When these practices are combined, farmers can maintain better soil conditions and create a more suitable environment for crop production.
Summary
Organic manure is a natural material obtained from plants, animals, and other biodegradable sources. Important types include farmyard manure, compost, green manure, poultry manure, animal manure, and vermicompost.
It can improve soil fertility, add organic matter, improve soil structure, increase water-holding capacity, support soil organisms, and help reduce farm waste. It is also useful in vegetable production, nursery preparation, fruit production, gardens, and general soil improvement.
The quality of the material depends on its source, decomposition, moisture, storage, and the materials used to prepare it. Proper preparation, storage, and application are important for getting good results.
Revision Questions
- What is organic manure?
- Mention five types of organic manure.
- State five sources of organic manure.
- Explain five benefits of using organic manure.
- Mention five uses of organic manure.
Frequently Asked Questions
What is organic manure?
Organic manure is a natural material from plants, animals, and other biodegradable sources that is added to the soil to improve fertility and soil condition.
What are the main types of organic manure?
The common types include farmyard manure, compost manure, green manure, poultry manure, animal manure, and vermicompost.
What are the sources of organic manure?
Sources include animal waste, crop residues, leaves, grass, farm waste, and suitable biodegradable household waste.
Can organic manure replace chemical fertilizer?
It can supply nutrients, but its nutrient content is usually less concentrated and less uniform than chemical fertilizer. Depending on the crop and soil, both may be used together.
Why is organic manure important in agriculture?
It helps improve soil fertility and structure, adds organic matter, supports soil organisms, improves water retention, and provides a useful way to recycle farm waste.
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