Wplyw terminu pobrania probek gleby na wspolzaleznosc miedzy zawartoscia P, K i Mg w wyciagu 0,01 mol CaCl2 dm-3 z gleby i ich stezeniem w plytkich wodach gruntowych
The effect of soil sampling term on the relationships between P, K and Mg content in 0,01 M CaCl2 soil extract and the elements concentration in shallow ground waters