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service opportunity developing encouragement motivation qualities leadership composition and functions of soil organic matter nature forms som history developments in 20th century history of soil organic matter contributions by shmuk berzelius etc scientists contribution history soil organic matter long term fertilizer experiments impact on soils and crops slow & high permeable soils soil crusting soil physical problems management of physical constraints hard pans rainfed and aerobic rice ecosystems semidry transplanted directed wet seeded texture soil water structure factors affecting soil water content pollution heavy metal accumulation soil erosion management measures soil health issues