Disadvantages of Manure The manures are reported to provide fewer nutrients to plants, and they are unable to provide high-yielding crops. Manures are slowly absorbed by the plants, and they add a lot of humus to the soil. They are made in fields, so transportation is difficult for manures.
Applying too much manure, at the wrong time, or improperly handling it in other ways releases nutrients into the air or into ground or surface waters. Thus, instead of nourishing crops, nutrients become pollutants. Excess nitrogen can leach through soil into groundwater.
Manure has some potential disadvantages when used as fertilizer. It can contain weed and pest seeds, rodents and other pests, and pathogens such as E. coli. It can also cause pollution if not managed properly, as the manure may flow into the surface or groundwater.
Don't Use Fresh Manure
If the manure is from a plant-eating animal, it is probably also full of weed seeds, which will not be inhibited from sprouting. If you still want to make use of fresh manure, don't apply it after your garden has been planted.
Blending manure into the top layer of topsoil will help encourage root growth and health because the manure is packed full of nutrients. The main nutrient released is nitrogen which is needed for plants and vegetables to grow in a sustainable manner.
Not all manure provides nutrients to plants. As it breaks down, manure containing lots of bedding takes nitrogen from the soil. This reduces the amount of nitrogen available to plants.
Many vegetable gardeners swear by the benefits of manure as a fertilizer. Adding manure to soil improves the soil's texture and water-holding capacity while providing nutrients needed by growing plants. Unfortunately, fresh manure can also contain bacteria that can contaminate vegetables and cause human disease.
Manure can contain human pathogens and through its use near fruits and vegetables, it can spread human pathogens to produce. Pathogens harmful to humans that are often found in manure include: pathogenic E. coli, Salmonella, and Listeria monocytogenes.
Adding too much manure can lead to nitrate leaching, nutrient runoff, excessive vegetative growth and, for some manures, salt damage. And using fresh manure where food crops are grown poses risks for contamination with disease-causing pathogens.
Manure contains nutrients, such as phosphorus and nitrogen, and pathogens, including bacteria, viruses and parasites. These pollutants contaminate water resources and reduce recreational potential of lakes and rivers, destroy wildlife habitat, and eliminate drinking water supplies for people and livestock.
Organic manure has a number of shortcomings, including low nutrient content, slow decomposition, and different nutrient compositions depending on its organic materials, compared to chemical fertilizers.
Manure adds nutrients to the soil without affecting its fertility. It does not damage crops and produces healthy plants. Fertilizers are chemicals which lower the fertility of the soil if used regularly. They also damage the crops and make them unhealthy for consumption.
The advantages of using farmyard manure are that it's readily available, cheap, and easy to use because it's hard to overuse it. The disadvantages are that it has to be transported, doesn't smell too good, and requires consistent levels of certain organisms in the soil to break it down.
Manure that is piled and left alone will decompose slowly. This can take three to four months if conditions are ideal. It can take a year or more if the starting material contains a wide carbon:nitrogen ratio (as is the case when manure contains wood chips).
Which is better, fertiliser or manure? Manure is better than fertiliser. Manure is derived naturally and adds a lot more than just nutrients to the soil. They increase the activity of the microbes in the soil and increase its fertility.
Horse manure
Horse manure has a higher nitrogen and nutrient content than cow dung. Moreover, horse waste contains significantly less water than cow manure; therefore, it can include up to twice as much nitrogen when dried. Horse manure requires composting or aging to kill weed seeds, larvae, and pathogens.
Ultimately, the best management practice for spreading horse manure is to not spread it raw; compost the material first. Also, be sure to spread only at a rate that is agreeable with the nutrients needed for your pastures and the crop that is growing.
Fresh, non-composted manure will generally have a higher nitrogen (N) content than composted manure. However, the use of composted manure will contribute more to the organic matter content of the soil. Fresh manure is high in soluble forms of N, which can lead to salt build-up and leaching losses if over applied.
Composting livestock manure reduces many of the drawbacks associated with raw manure use. It's also less likely to cause nutrient imbalances. The composted manure can safely be applied directly to growing vegetable crops.
Apply nutrients in the spring just before growth starts. Avoid using manures and fertilisers in late summer or autumn where they may be lost over winter and pollute water bodies.
Cow manure is a great all-purpose fertilizer. It's low in nitrogen so it won't burn your tender plants, and has a good balance of nutrients. What's more, since a cow's four stomachs digest its food so thoroughly, very few weed seeds make it through, so you don't have to worry about them.
Simply ageing a manure pile for three months can kill about 60% of the weed seeds present, and bacterial counts start to drop within days after the manure leaves the animal. Then, when the aged manure is mixed into the soil, soil microorganisms clear out residual bacteria in about a month.