In soils the gross amount of nitrogen and carbon are highly positively correlated.

soil pH play role in regulating the decomposition of organic matter in the soil. Acidic low pH reduces the labile carbon pool.

Acidity is being contributed by organic decomposition, also phone is buffered by phenolic, enolic and carboxylic group present in organic fractions.

In principle, soil organic carbon dictates soil N and vice- versa. The soil-plant-atmosphere continuum dictates soil C and N.

Organic matter is stabilized when it combines with the soil clay fraction. This allows the organic matter not to rapidly decay but instead have a long term legacy. Clay and soil organic tend to separate out due to both possess an overall negative charge electrostatically repelling each other. In isolated condition soil organic matter can be rapidly decayed. When the soil is rich in multivalent cationic positively charged ions such as Calcium, Iron Magnesium and Aluminum the cation facilitates a complex organomineral complex which cloaks the organic matter making it more able to maintain itself in the soil and help its physical chemical and biological benefits. Sandy soils may need fine clay and silt along with organic matter and minerals to optimize the soil condition. Best reaction of a wide range of crops is facilitated at a slightly acid pH and sufficient soil organic matter and a mineral rich condition when physical structure is not limiting.

Soil pH influences a number of soil chemical properties, including soil carbon. The decomposition of organic matter and mineralization of organic carbon are mediated by microorganisms that require favourable pH range for their survival. Most soil bacteria grow best around neutral pH (6.6 – 7.3). Outside this range, the growth of these bacteria are impeded, which affects their ecosystem functions of decomposition of organic matter and mineralization of organic C.

The relationship of soil carbon pool and soil nitrogen dynamics is often observed to be positive. This stems from the fact that organic carbon, which constitutes the soil carbon pool as well as organic N are both components of organic matter.

Application of soluble ammoniated nitrogen fertilizer can lead to acidification of soil. Soluble nitrogen can greatly stimulate the microbial breakdown of soil organic matter through microbial decay. When soils have acid tendency in particular the application of ammoniated fertilizers need to be monitored for acidification and depletion of soil organic matter resources. In alkaline environments the use of sulfur and ammoniated fertilizer may be pracitical in getting a optimized soil pH condition. When soils are overly acid and low in calcium the ability of earthworms can be greatly compromised. Earthworms can be the great soil renovators and can abound in pastures which have correct pH and plenty of Calcium.

The fluctuation in soil PH can depress soil microbial community and soil fauna, the most effective creatures to which organic matter can be decomposed leading to more microbial products .

Soils with high PH always have lower amounts of organic carbon and nitrogen nutrients due to a suppression of microbial community responsible for organic matter decomposition. The same episode will be happened when soils are acidic.

Furthemore, some factors affect this story like clay percentage, soil texture, crop , a covered grass and soil temperatures.

Nice updates by most of researchers.

Infact C pool works as buffer/reser voir for various ph and nutrient related activities in conjunction with soil flora and fauna.

The final equilibrium soil carbon in top soil can be estimated by the combined amount of clay and calcium. The use of lime to bring soil to near neutral pH can be a practice to add in ability to elevate soil carbon as well as the amendment of sandy soil with clay and silt. The adjustment of soil pH and the remediation of sandy soils is not often discussed. In terms of soil if the calcium exceeds 1% 1000 in the soil test their should be no calcium issues. Acid soils are often Magnesium deficient and dolomitic limeston should be employed if the Magnesium soil reading is less than 100.