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1. Der Umsetzungsstand der Wasserrahmenrichtlinie in Polen W. Lipinski, J. Igras, 2006, izvirni znanstveni članek Ključne besede: agricultural policy, agricultural legislation, rural legislation, European Union, Poland, water management, water quality, nitrates, water management |
2. Nitrogen and phosphorus budgets in Poland as a tool for sustainable nutrients management Jerzy Kopiński, Arkadiusz Tujaka, Janusz Igras, 2006, izvirni znanstveni članek Ključne besede: Poland, nitrogen, phosphorus, analytical methods, sustainability, soil fertility |