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Literatur Hera C, Schnug E, Dumitru M, Dorneanu A (eds) (2001) Role of fertilizers in sustainable agriculture : 12th International Symposium of the International Scientific Centre of Fertilizers (CIEC), 21-22 August, 2000, Suceava, Romania ; proceedings. Bucharest: RISSA, 550 p

Literatur Sparovek G, Schnug E (2001) Precision agriculture and soil tillage. In: Hera C, Schnug E, Dumitru M, Dorneanu A (eds) Role of fertilizers in sustainable agriculture : 12th International Symposium of the International Scientific Centre of Fertilizers (CIEC), 21-22 August, 2000, Suceava, Romania ; proceedings. Bucharest: RISSA, pp 233-244