engleski

Influences of genotype and potassium fertilization on nutritional status of maize on K-fixing soil

Five hybrids were grown on Gundinci gleysol for four growing seasons (2001-1004). Two ameliorative rates of K as KCl were applied (500 and 1250 kg K2O/ha) on standard fertilization. The ear-leaf of maize was taken at beginning of silking of the second year of testing from the control and 1400 kg K2O ha-1 treatments. n general, heredity was more influencing factor of maize nutritional status (the ear-leaf composition) compared to KCl fertilization. ery high influences of genotype (in the brackets: % higher value of the highest compared to the lowest concentration: means in level of the hybrid) were found for chromium (93%), barium (35%), copper and strontium (30%). Considerable lower differences among the hybrids were found for phosphorus and sulphur (10%), boron and calcium (15%) and zinc (18%), while for remaining elements they were between 22% and 24% ( K, Mg, Fe, Na, Mn and Al). The highest rate of KCl resulted in significant increases of maize yield of 14%, 24% and 12%, for 2001, 2002 and 2003, respectively ; while in the fourth year similar yields were found. The OsSK552 and Bc5982 hybrids (mean 8.70 t/ha) were more susceptible to soil stress in comparison with OsSK444 and OsSK458 (9.7 t/ha).

potassium fertilization ; maize hybrids ; K-fixing soil ; ear-leaf composition ; yield

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