pH of Composted Cow Manure

Composted cow manure is a valuable organic amendment used in agriculture and gardening. It enhances soil fertility, improves soil structure, and provides essential nutrients for plant growth. The pH of composted cow manure is an important factor to consider when using it as a soil amendment, as it can affect the availability of nutrients to plants and the overall health of the soil.

pH Range of Composted Cow Manure

The pH of composted cow manure can vary depending on several factors, including the type of feed the cows consume, the presence of alkaline materials in the bedrock under the pasture, and the concentration of urine in the manure. Generally, the pH of composted cow manure can range from slightly acidic to slightly alkaline.

Fresh Cow Manure pH

Fresh cow manure typically has a higher pH compared to composted cow manure. The pH of fresh cow manure can range from 7.4 to 8.5. This higher pH is attributed to the presence of volatile fatty acids and other organic compounds produced during the digestion process in the cow’s rumen.

Composted Cow Manure pH

The pH of composted cow manure can be slightly lower than that of fresh cow manure. One source mentions a pH range of 7.8 to 8.5 for composted cow manure. Another source mentions a pH range of approximately 5.9 to 6.9 for manure mixtures. The composting process, which involves the decomposition of organic matter by microorganisms, can lead to a decrease in pH due to the production of organic acids and the release of hydrogen ions.

Factors Affecting pH

The pH of cow manure can be influenced by several factors:

1. Type of FeedThe type of feed consumed by cows can affect the pH of their manure. For example, diets high in legumes tend to produce manure with a lower pH, while diets high in grains tend to produce manure with a higher pH.
2. Alkaline Materials in BedrockThe presence of alkaline materials in the bedrock under the pasture where cows graze can also influence the pH of their manure. These alkaline materials can leach into the soil and manure, increasing the pH.
3. Concentration of UrineThe concentration of urine in cow manure can also affect its pH. High concentrations of urine can lower the pH of the manure due to the presence of urea and other nitrogenous compounds.

Conclusion

The pH of composted cow manure is an important factor to consider when using it as a soil amendment. The pH can vary depending on several factors, including the type of feed the cows consume, the presence of alkaline materials in the bedrock under the pasture, and the concentration of urine in the manure. Generally, the pH of composted cow manure can range from slightly acidic to slightly alkaline.

References

1. Chemical characterization of fresh and composted livestock manures. (2013). Journal of Soil Science and Plant Nutrition, 13(1), 11-20. https://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162013000100011
2. The pH Level of Cow Manure & Potting Soil. (2022, November 22). eHow. https://www.ehow.com/info_8724781_ph-cow-manure-potting-soil.html
3. PH Level of Cow Manure. (2017, September 21). Garden Guides. https://www.gardenguides.com/131615-ph-level-cow-manure.html

FAQs

What is the pH range of composted cow manure?

The pH of composted cow manure can vary depending on several factors, but it typically ranges from slightly acidic to slightly alkaline. Different sources mention different pH ranges, but it is generally accepted that composted cow manure can have a pH between 5.9 and 8.5.

How does the pH of composted cow manure compare to the pH of fresh cow manure?

Fresh cow manure typically has a higher pH compared to composted cow manure. This is because the composting process, which involves the decomposition of organic matter by microorganisms, can lead to a decrease in pH due to the production of organic acids and the release of hydrogen ions.

What factors can affect the pH of composted cow manure?

Several factors can affect the pH of composted cow manure, including:

• Type of feed consumed by cows: Diets high in legumes tend to produce manure with a lower pH, while diets high in grains tend to produce manure with a higher pH.
• Presence of alkaline materials in bedrock: Alkaline materials in the bedrock under the pasture where cows graze can leach into the soil and manure, increasing the pH.
• Concentration of urine in manure: High concentrations of urine can lower the pH of the manure due to the presence of urea and other nitrogenous compounds.

Why is the pH of composted cow manure important?

The pH of composted cow manure is important because it can affect the availability of nutrients to plants and the overall health of the soil. Most plants prefer slightly acidic to neutral soils, so composted cow manure with a pH in this range is ideal. If the pH is too high or too low, it can limit the availability of certain nutrients and potentially harm plants.

How can I adjust the pH of composted cow manure?

If the pH of composted cow manure is too high or too low, it can be adjusted using amendments such as lime or sulfur. Lime can be added to increase the pH, while sulfur can be added to decrease the pH. It is important to test the pH of the composted cow manure before adding any amendments to determine the appropriate amount needed.

What are the benefits of using composted cow manure as a soil amendment?

Composted cow manure has several benefits as a soil amendment, including:

• Improves soil structure and tilth
• Enhances soil fertility by adding essential nutrients
• Increases water-holding capacity
• Suppresses plant diseases and pests
• Reduces the need for chemical fertilizers

How can I properly apply composted cow manure to my garden or lawn?

Composted cow manure should be applied to the soil in a thin layer and then tilled or dug in. It is important to avoid applying too much composted cow manure, as this can lead to nutrient imbalances and potentially harm plants.

Where can I find more information about the pH of composted cow manure?

There are several resources available online and in libraries that provide more information about the pH of composted cow manure. You can also consult with local agricultural extension offices or gardening experts for specific recommendations based on your location and soil conditions.