engleski

Nutritional disorders of corn growing in the Eastern Croatia

Nutritional disorders in corn accompanied with K deficiency have been found on some clay soils of Posavina area. It is in close connection with strong K-fixation and excess of plant available magnesium (Mg) in soil. In some cases is K deficiency accompanied with low phosphorus (P) supplies. Our experiences with adequate fertilization and choice of hybrids for these soils were shown in this study. By K fertilization was considerable increased corn yields. For example, in the Mikanovci trial was applied 2670 kg K2O/ha and corn yields (3-year means) were increased from 1.93 t/ha to 7.64 t/ha or four-fold. At same time, K and Mg status in corn leaves (0.60% K, 1.94% Mg and 1.66% Ca on the control ; 1.58% K, 0.95% Mg and 1.64% Ca on the highest K treatment). Similar trends were found by the other experiments including ameliorative either K or P rates. Two groups of seven corn hybrids contain same inbred line as a father (Os1-48 for the A group and Os87-24 for the B group) were grown under soil stress characterizing K-deficiency and excess of Mg. The hybrids of A group characterized considerable lower percentage of stalk lodging, lower P contents in the lower part of stalk at maturity and higher yield. By the second trial, ten corn hybrids were grown on similar soil and ordinary fertilization. Two hybrids (OsSK568exp. and OsSK602) yielded over 8.0 t/ha (mean 8.80 t/ha). and by their growing is also possible to increase corn yields under soil stress.

corn ; nutrition ; disorders ; Croatia ; potassium ; phosphorus

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