Study of Hari K. Pant (2003) noted that the amount of phosphorus and nitrogen will affect the amount of humic substances is an important element of the organic matter in the soil. While other studies. As a study of Zhanhuan Shang et al. (2014) and DJ Ross et al. (1999) found that agricultural practices and changes in land use. Affect the amount of carbon, nitrogen and phosphorus, carbon and phosphorus in the soil, but the soil is not correlated with each other.
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