INFLUENCE OF POTASSIUM CHLORIDE ON YIELD AND NUTRITIONAL STATUS IN CORN HYBRIDS
Titel:
INFLUENCE OF POTASSIUM CHLORIDE ON YIELD AND NUTRITIONAL STATUS IN CORN HYBRIDS
Auteur:
Vlado Kovačević Ivan Brkić
Verschenen in:
Poljoprivreda
Paginering:
Jaargang 9 (2003) nr. 1 pagina's 15-19
Jaar:
2003
Inhoud:
Six corn (Zea mays L.) hybrids (OsSK 377; OsSK 382; OsSK 407; OsSK 552; OsSK 644 and Bc 66-61) were grown on strong K-fixing soil during the growing season 1993. Increased K fertilization in KCl form was applied in spring of 1990 to level of 3250 kg K2O ha-1. Four rates were used for testing corn hybrids response (150, 1000, 1900 and 3250 kg K2O ha-1). Response of corn to K fertilization was very pronounced: grain yields were in range from 1.83 t h-1 (150 kg K2O ha-1) to 7.04 t ha-1 (3250 K2O ha-1). Differences of grain yields among corn hybrids were from 4.35 t ha-1 (Bc 66-61) to 5.31 t ha-1 (OsSK 407). Significant differences of nutritional status among the hybrids were found as follows (mg kg-1): 18.9-26.5 (zinc), 14.4-17.4 (manganese), 120-144 (iron) and 18.2-23.2 (copper), respectively. Zinc status in corn leaves was independent on applied fertilization, while the concentration of manganese, iron and copper was significantly decreased by application of the highest KCl rate (mg kg-1: 17.4 and 12.6 Mn, 150 and 120 Fe, 21.5 and 18.5 Cu, for the control and 3250 kg K2O ha-1, respectively). As affected by KCl fertilization there were found considerable differences in K and Mg status of corn leaves as follows: 0.31% K (acute K deficiency) and 1.18% K, as well as 1.08% Mg and 0.47% Mg, for the control and 3250 kg K2O ha-1, respectively.
Uitgever:
Faculty of Agriculture in Osijek (provided by DOAJ)
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