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the medicinal herb Calendula officinalis (Asteraceae). Plant Soil Environ 57(11):499–504
Zhang GS, Chan KY, Oates A, Heenan DP, Huang GB (2007) Relationship between soil structure
and runoff/soil loss after 24 years of conservation tillage. Soil Tillage Res 92(1–2):122–128
350
S. Singh et al.