Conventional Agriculture Problems
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Research Article Organic agriculture and the global food supply Catherine Badgley a1 , Jeremy Moghtader a2 a3 , Eileen Quintero a2 , Emily Zakem a4 , M. Jahi Chappell a5 , Katia Avilés-Vázquez a2 , Andrea Samulon a2 and Ivette Perfecto a2 c1 a1 Museum of Palaeontology, University of Michigan, Ann Arbor, MI 48109, USA. a2 School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI 48109 USA.
Soil retrogression and degradation are two regressive evolution processes associated with the loss of equilibrium of a stable soil . Retrogression is primarily due to erosion and corresponds to a phenomenon where succession reverts back to pioneer conditions (such as bare ground). Degradation is an evolution, different from natural evolution, related to the local climate and vegetation. It is due to the replacement of primary plant communities(known as climax) by secondary communities. This replacement modifies the humus composition and amount, and affects the formation of the soil. It is directly related to human activity.