US EPA

4596824 

Journal Article 

INTERACTION BETWEEN POTASSIUM, MAGNESIUM, CALCIUM, MANGANESE AND PHOSPHORUS IN THEIR UPTAKE BY BARLEY 

Matula, J 

1992 

1 

Rostlinná Výroba
ISSN: 0370-663X 

38 

11 

919-928 

WOS:A1992KD60200006 

Soil samples of seven sites representing pedology of practical fields of the co-operative at Kovarov were taken from the locality noted for marked problems with performance and health conditions of cattle. On the basis of designation of starting chemism and soil stock with nutrients (Tab. I) its adjustments were modelled through fertilizing with CaCO3, MgCO3. KCl and Ca(H2PO4)2 which were subsequently tested by 28-day persisting vegetative lest comprising spring barley in climabox.



The results of trials showed synergism between P and Mn content in plant (Fig. 5). The rise of labile P levels in soil corresponded with higher Mn content in plants (Fig. 8) and in turn, with lower Mg content (Fig. 9). The most closest relationships between soil test and nutritional state of plants in the case of P were found in the method described by Matula , Pirkl (1988). This was followed by another methods: Mehlich (1978), Egner and simulated soil solution (Matula, 1985). To assess the soil reserve with Mn, by far the best was the method referred by Matula, Pirkl (1988) and Matula (1985). The method published by Mehlich (1978) was proved as unsuitable. Higher Mn contents in plants coresponded with lower accumulation of nitrates in plants (Fig. 7). Lower content of nitrates, cannot be explained by better N utilization by plant but rather by depression in its uptake under the state of accessive Mn content in plants signalled by the fall in the index of efficiency of Mn in plants (Fig. 7). Expected N-uptake depression is enhanced by the relationship found in the course of organic N content and Mn contained in plants (Fig. 7). The best prediction of Mn content in plants was achieved on the basis of the relationship which included the values of soil reserve with Mn and P by the method as described by Matula, Pirkl (1988), and the ration of K/square-root Ca + Mg activity in simulated soil solution. A good congruence was pined in substitution of soil reserve with Mn and P by their concentration in simulated soil solution (Fig. 12).



Synergetic relationship of K to Mn uptake by plant was recorded (Fig. 11). Soils were noted for lower level of K. K concentration in simulated soil solution did not exceed significantly the value 0.5 mM, except for soil 5 (0.76 mM). There was a strong antagonism between Mn and Mg(Fig. 4) and on the contrary, rather synergism between Mg and Ca was observed (Fig. 3). A dominant position could be ascribed to K (Figs 1 and 2) in interactions among cations. Its depressive effect on the content of another cations was significant merely in the case of Mg and Ca. The close character of the relationship was improved when the ratio of activity K/square-root Ca + Mg was used. The interactions found can have great practical impacts upon the quality of mineral composition of vegetative biomass of plant production.