Einfluß des Ammoniumangebotes auf Wachstum,Mineralstoff- und Polyamingehalt junger Maispflanzen

Influence of ammonium supply on growth, mineral nutrient and polyamine contents of young maize plants The influence of an increasing ammonium supply on the growth, mineral nutrient and polyamine contents of young maize plants was investigated in nutrient solution culture. A high ammonium concentration in the nutrient solution reduced shoot growth, lowered the shoot/root ratio and increased the dry matter content. The N content of the roots was increased, while the K content of the whole plant was reduced considerably. However, the plant analysis did not indicate nutrient deficiency. Ammonium nutrition induced an accumulation of putrescine in shoots and roots. None the less, regarding the ionic balance, K was only marginally substituted by putrescine, despite a close negative relationship between the putrescine and the K contents.