00376nam a2200121Ia 4500008004100000082003100041100001500072245010800087260002000195300000900215600001600224650001400240130903s9999    xx            000 0 und d  aPH 631.83(213)(082.2)   M6  a G.W.Cooke  aThe role and importance of potassium in the agricultural systems of the humid tropics; the way forward.  aBernbIPIc1986  a39p.  aCooke, G.W.  aPotassium